C550GT ICA v.8 11-09-2020 copy

MAINTENANCE MANUAL SUPPLEMENT 77-40-02-Integrated Engine Instrument Systems
C550GT-AD016-FU24-0213
Integrated Engine Instrument Systems Revision: Initial Issue DATE: 01/01/2020

Description Description and Operation / Fuel Pressure

Fuel Pressure
Integrated Engine Instrument Systems

77-40-02 Fuel Pressure

Description and Operation

Fuel Pressure Indicating - Description

The PT-30GA Fuel Pressure Transducer attaches to the firewall bracket with a P-clamp. The transducer connects
with a flexible hose to the fitting on the fuel inlet to the Fuel Oil Heater.

The transducer produces an electrical pressure signal. The Engine Data Converter receives the data and then
displays it on the MVP-50T Engine Monitor Panel.
Fuel Pressure is shown on a colour-coded Vertical Strip Gauge with an arrow which marks
the current pressure. A digital value in PSI is displayed below the vertical bar. This digital
value changes to flashing red if the Fuel Pressure enters the warning range.

(The configuration of the main screen display is still not defined; this paragraph will be
edited when more information is available)
For

For Description and Operation of the display,
Ref. Ext. Doc: Ref.Ext.Doc. Electronics International Inc. MVP-50T Operating Instructions
(Doc. No. 1206067).

For engine compartment component installation,
Ref. Ext. Doc: Electronics International Inc. MVP-50T Instructions for Continued Airworthiness (Doc. 06201101,
latest revision).
Ref. Dwg. No: AD-550GT-7700-001-000

Troubleshooting.

a. Refer to Section 7.2 of the E. I. Inc. Installation Instructions for fault finding information.
Ref. Ext. Doc: Electronics International Inc. Glass Panel Engine Monitor MVP-50T (for Turboprops and Jets)
Installation Instructions (II-1211061, latest revision).

b. Use the applicable E.I. Inc Field Test Device for troubleshooting and fault diagnosis of the wiring or
components of the Fuel Pressure Indicating System.

Model No. FCD-FP: Fuel/Oil Pressure Signal
Outputs a variable pressure signal (0 to 100+ PSI, 0-50 mV).

c. For EDC 33T Interwiring and connectors,
Ref. Dwg. No: AD-550GT-7700-001-201

d. For Interwiring to the MVP-50T Engine Monitor Display,
Ref. Dwg. No: AD-550GT-7700-001-101

Page 1

MAINTENANCE MANUAL SUPPLEMENT 77-40-02- Integrated Engine Instrument Systems
C550GT-AD016-FU24-0213
Integrated Engine Instrument Systems Revision: Initial Issue DATE: 01/01/2020

Fuel Pressure Indicating Maintenance Practices / Fuel Pressure Indicating
Integrated Engine Instrument Systems

Maintenance Practices

1. Removal and Installation

Monitor Panel

For Removal and Installation of the Monitor Panel and associated components,
Ref. Ext. Doc: Electronics International Inc. Glass Panel Engine Monitor MVP-50T (for Turboprops and Jets)
Installation Instructions (II-1211061, latest revision).

Fuel Pressure Transducer

For Removal and Installation of the transducer and associated components,
Ref. Ext. Doc: Electronics International Inc. Glass Panel Engine Monitor MVP-50T (for Turboprops and Jets)
Installation Instructions (II-1211061, latest revision).

Figure 77.1 Transducer bracket - mounted on engine firewall

2. Adjustment and Test.
(1) System Test.
Use the applicable E.I. Inc Field Test Device to test the wiring and correct operation of the components of the
Fuel Pressure Indicating System.
Model No. FCD-FP: Fuel/Oil Pressure Signal.
Outputs a variable pressure signal (0 to 100+ PSI, 0-50 mV).

(2) Calibration.
a. For field calibration of the Fuel Pressure Indicating System from the (engine/firewall) aft, use a Field
Calibration Device (FCD). These units provide a calibrated signal that may be used to verify the calibration
of a given E.I. instrument.

Option 1.
NIST Traceable Field Calibration Device.
Model No. FCD-PRESS -NIST: Pressure Signal. (Available from Electronics International Inc. - NIST certified)

Use this unit to provide a calibrated signal that may be used to verify the calibration of the system. This can be
useful when performing flight tests or engine performance verification runs. The FCDs are traceable to NIST and
come with calibration paperwork.

Page 201

MAINTENANCE MANUAL SUPPLEMENT 77-40-02-Integrated Engine Instrument Systems
C550GT-AD016-FU24-0213
Integrated Engine Instrument Systems Revision: Initial Issue DATE: 01/01/2020

Maintenance Practices / Fuel Pressure Indicating

Option 2.

Universal Field Calibration device.
Model No. FCD-TR-1. (Available from Electronics International Inc. - NIST certified)
Use this unit to provide a calibrated signal that may be used to verify the calibration of a given E.I. instrument.

This Bluetooth® field calibration device will allow wireless data retrieval, test and calibration for all engine
indication systems.

NOTE: NIST traceable calibration is an assurance program that certifies that a laboratory or manufacturer is
fully equipped to calibrate equipment to National Institute of Standards and Technology (NIST)
standards and that any products offered by that manufacturer will match those NIST-maintained
measurement standards.

b. Obey the instructions provided with the Electronics International Inc. FCD to field calibrate the C550GT Fuel
Pressure Indicating System and MVP-50T Glass Panel Engine Monitor.

Page 202

MAINTENANCE MANUAL SUPPLEMENT 77-40-03-Integrated Engine Instrument Systems
C550GT-AD016-FU24-0213
Integrated Engine Instrument Systems Revision: Initial Issue DATE: 01/01/2020

Description Description and Operation / Fuel Quantity Ind.

Fuel Quantity Ind.
Integrated Engine Instrument Systems

77-40-03 Fuel Quantity Indicating

Description and Operation

Fuel Quantity Indicating - Description

Each LE Fuel Tank has a capacitive fuel quantity probe. Each probe has an Interface Module built into the wiring
harness. The wiring for the probe connects through sealed rigid tubing inside the tank that exits at the outboard
rib. Each quantity probe signal is connected to the Engine Data Converter (EDC) through the aircraft’s wiring
looms and connectors.
The EDC processes fuel level data from each probe for display
on the MVP-50T Engine Monitor Panel. Each LE Tank has a
colour-coded vertical strip Fuel Quantity Indicator with an
arrow marking the current fuel level. A digital value in Litres is
displayed below.

(The configuration of the main screen display is still not
defined; this paragraph will be edited when more
information is available. Would also like to get an
illustration of the C550GT configuration, showing Inbd/
Otbd Tank and Litres, this can be created from a photo)

For Description and Operation of the Engine Monitor Panel,
Ref. Ext. Doc: Electronics International Inc. MVP-50T Operating Instructions (Doc. No. 1206067).

For Description and Operation of the P-300 Capacitive Fuel Probe.
Ref. Ext. Doc: Electronics International Inc. Glass Panel Engine Monitor MVP-50T (for Turboprops and Jets)
Installation Instructions (II-1211061, latest revision).

NOTE: See Sec. 7.9 -Troubleshooting.

Troubleshooting
a. Refer to Sec. 7.9 of the E. I. Inc. Installation Instructions for fault finding information on the Capacitive Fuel
Level system.

Ref. Ext. Doc: Electronics International Inc. Glass Panel Engine Monitor MVP-50T (for Turboprops and Jets)
Installation Instructions (II-1211061, latest revision).

b. Use the Electronics International Inc. Field Calibration Device
Model: FCD-CFL: Capacitive Fuel Level Signal
This FCD outputs a variable capacitive fuel level signal. Obey the instructions provided with the Electronics
International Inc. FCD.

c. For EDC 33T Interwiring and connectors,
Ref. Dwg. No: AD-550GT-7700-001-201

d. For Interwiring to the MVP-50T Engine Monitor Display,
Ref. Dwg. No: AD-550GT-7700-001-101

Page 1

MAINTENANCE MANUAL SUPPLEMENT 77-40-03- Integrated Engine Instrument Systems
C550GT-AD016-FU24-0213
Integrated Engine Instrument Systems Revision: Initial Issue DATE: 01/01/2020

Fuel Quantity Ind. Maintenance Practices / Fuel Quantity Ind.
Integrated Engine Instrument Systems

Maintenance Practices

1. Removal and Installation.

Engine Monitor Panel

For Removal and Installation of the Monitor Panel and associated components,
Ref. Ext. Doc: Electronics International Inc. Glass Panel Engine Monitor MVP-50T (for Turboprops and Jets)
Installation Instructions (II-1211061, Latest Revision).

Fuel Quantity Probes.

Refer to Chapter 28-40-01 for Quantity Probe Removal and Installation. (Link to Chp 28)

2. Adjustment and Test

(1) System Test.

Use the applicable E.I. Inc Field Test Device to test the wiring and correct operation of the components of the
Fuel Flow Indicating System.

Model: FCD-CFL: Capacitive Fuel Level Signal
This FCD outputs a variable capacitive fuel level signal. (300 to 5 KHz, 9V Sq Wave).

(2) Calibration.

Refer to Section 7.0 of the MVP-50T Instructions for Continued Airworthiness. Information is also available in the
MVP-50T Operating Instructions, Section 6.10 “Fuel Tank Calibration”.
Ref. Ext. Doc: Electronics International Inc. Glass Panel Engine Monitor MVP-50T (for Turboprops and Jets)
Installation Instructions (II-1211061, latest revision).

Page 201

MAINTENANCE MANUAL SUPPLEMENT 77-40-04-Integrated Engine Instrument Systems
C550GT-AD016-FU24-0213
Integrated Engine Instrument Systems Revision: Initial Issue DATE: 01/01/2020

Description Description and Operation / Oil Pressure

Oil Pressure
Integrated Engine Instrument Systems

77-40-04 Oil Pressure

Description and Operation

Description and Operation

Engine Oil Pressure is taken at a restricted fitting above the engine oil pump filter assembly on the RH side of the
Accessory Gearbox (AGB). A flexible hose connects this fitting to the transducer on the firewall bracket.

Figure 77.2 Oil Pressure Fitting

The PT-100GA Transducer, mounted to the firewall bracket, produces an electrical pressure signal. The Engine
Data Converter receives the data and then displays it on the Engine Monitor Panel. Oil Pressure is shown on a
colour-coded Vertical Strip Gauge with an arrow marking the current pressure range. A digital value in PSI is
displayed below the vertical bar.
The colour of the digital value changes to correspond with the operating range.
Red =Warning.
Yellow = Cautionary Range.
Green = Normal Operating Range.

(The configuration of the main screen display is still not defined; this paragraph will be
edited when more information is available)

Troubleshooting.
a. For troubleshooting of the Oil Pressure Indicating System from the pressure transducer aft, refer to Section
7.0 of the MVP-50T Installation Instructions.

Ref. Ext. Doc: Electronics International Inc. Glass Panel Engine Monitor MVP-50T (for Turboprops and Jets)
Installation Instructions (II-1211061, latest revision).

b. Use the E.I. Inc. Field Calibration Device (FCD) to isolate the fault.
Model. No. FCD-FP: Fuel/Oil Pressure Signal. (Available from Electronics International Inc.)
This FCD outputs a variable pressure signal (0 to 100+ PSI, 0-50 mV).

NOTE: Obey the instructions provided with the Electronics International Inc. FCD
c. For wiring and connector information refer to the EDC-33T Interwiring electrical schematic.
Ref. Dwg. No: AD-550GT-7700-001-201
d. For troubleshooting a suspected fault in the PT6A-15AG Turboprop Engine Oil System, refer to the P&WC

Maintenance Manual.
Ref. Ext. Doc: P&WC Maintenance Manual, Turboprop Gas Turbine Engine, Model PT6A-15AG Manual Part No.
3030442 (latest revision).

i. 72-00-00 - Engine Turboprop, Section 5. Fault Isolation, para. F. Engine Lubrication.
ii. See Engine Lubrication Fault Isolation Chart (Ref. Fig. 104).

Page 1

MAINTENANCE MANUAL SUPPLEMENT 77-40-04- Integrated Engine Instrument Systems
C550GT-AD016-FU24-0213
Integrated Engine Instrument Systems Revision: Initial Issue DATE: 01/01/2020

Oil Pressure Maintenance Practices / Oil Pressure
Integrated Engine Instrument Systems

Maintenance Practices

1. Removal and Installation

Monitor Panel

For Removal and Installation of the Monitor Panel and associated components,
Ref. Ext. Doc: Electronics International Inc. Glass Panel Engine Monitor MVP-50T (for Turboprops and Jets)
Installation Instructions (II-1211061, latest revision).

Oil Pressure Transducer

For information on Removal and Installation of the transducer,
Ref. Ext. Doc: Electronics International Inc. Glass Panel Engine Monitor MVP-50T (for Turboprops and Jets)
Installation Instructions (II-1211061, latest revision).

2. Adjustment and Test

(1) System Test.

a. Use the applicable E.I. Inc Field Test Device to test the wiring and correct operation of the components of
the Oil Pressure Indicating System.

Model No. FCD-FP: Fuel/Oil Pressure Signal.
Outputs a variable pressure signal (0 to 100+ PSI, 0-50 mV).

b. For Adjustment and Test of the PT6A-15AG Turboprop Engine Oil System, refer to the P&WC Maintenance
Manual.
i. 71-00-00 Powerplant Adjustment and Test, Para. 12.
ii. Sec. B. Removal of Oil Pressure Relief Valve.
iii. Sec. E. Installation of Oil Pressure Relief Valve.

Ref. Ext. Doc: P&WC Maintenance Manual, Turboprop Gas Turbine Engine, Model PT6A-15AG Manual Part No.
3030442 (latest revision).

(2) Calibration.

a. For field calibration of the Oil Pressure System from the (engine/firewall) aft, use a Field Calibration Device
(FCD). These units provide a calibrated signal that may be used to verify the calibration of a given E.I.
instrument.

Option 1.

NIST Traceable Field Calibration Device.
Model No. FCD-PRESS-NIST: Pressure Signal. (Available from Electronics International Inc. - NIST certified)
Outputs a NIST calibrated pressure signal that simulates a PT-100GA pressure transducer. This unit tests the
instruments pressure channel, not the pressure transducer. Use this unit to provide a calibrated signal that may
be used to verify the calibration of the system. This can be useful when performing flight tests or engine
performance verification runs. The FCDs are traceable to NIST and come with calibration paperwork.

Option 2.

Universal Field Calibration device.
Model No. FCD-TR-1. (Available from Electronics International Inc. - NIST certified)
Use this unit to provide a calibrated signal that may be used to verify the calibration of a given E.I. instrument.
This Bluetooth® field calibration device will allow wireless data retrieval, test and calibration for all engine
indication systems.

NOTE: NIST traceable calibration is an assurance program that certifies that a laboratory or manufacturer is
fully equipped to calibrate equipment to National Institute of Standards and Technology (NIST)
standards and that any products offered by that manufacturer will match those NIST-maintained
measurement standards.

b. Obey the instructions provided with the Electronics International Inc. FCD to field calibrate the C550GT Oil
Pressure Indicating System and MVP-50T Glass Panel Engine Monitor.

Page 201

MAINTENANCE MANUAL SUPPLEMENT 77-40-01-Integrated Engine Instrument Systems
C550GT-AD016-FU24-0213
Integrated Engine Instrument Systems Revision: Initial Issue DATE: 01/01/2020

Description Description and Operation / Oil Temperature

Oil Temperature
Integrated Engine Instrument Systems

77-40-05 Oil Temperature

Description and Operation

Engine Oil Temperature - Description

Oil Temperature is sensed by a temperature sensitive probe in the engine accessory gearbox housing. The probe
connects to an Alumel/Chromel engine harness to produce a millivolt temperature signal. The Engine Data
Converter processes this analog signal and then displays it on the Engine Monitor Panel. Oil Temperature is
shown on a colour-coded Vertical Strip Gauge with an arrow marking the current temperature. A digital value in
PSI is displayed below the vertical bar.
The colour of the digital value changes to correspond with the operating range.
Red =Warning.
Yellow = Cautionary Range.
Green = Normal Operating Range.

(The configuration of the main screen display is still not defined; this paragraph will be
edited when more information is available)

Troubleshooting

a. For troubleshooting of the Oil Temperature Indicating System from the temperature probe aft, refer to
Section 7.0 of the MVP-50T Installation Instructions. Use the E.I. Inc. Field Calibration Device (FCD) to
isolate the fault.

Model. No. FCD-T-NIST: Temperature Signal.
Outputs a calibrated temperature signal and may be used to verify and calibrate any Electronics International Oil
Temperature Indicating system
Ref. Ext. Doc: Electronics International Inc. Glass Panel Engine Monitor MVP-50T (for Turboprops and Jets)
Installation Instructions (II-1211061, latest revision).

b. For wiring and connector information refer to the EDC-33T Interwiring electrical schematic.
Ref. Dwg. No: AD-550GT-7700-001-201

Page 1

MAINTENANCE MANUAL SUPPLEMENT 77-40-01- Integrated Engine Instrument Systems
C550GT-AD016-FU24-0213
Integrated Engine Instrument Systems Revision: Initial Issue DATE: 01/01/2020

Oil Temperature Maintenance Practices / Oil Temperature
Integrated Engine Instrument Systems

Maintenance Practices

1. Removal and Installation

Monitor Panel

For Removal and Installation of the Monitor Panel and associated components,
Ref. Ext. Doc: Electronics International Inc. Glass Panel Engine Monitor MVP-50T (for Turboprops and Jets)
Installation Instructions (II-1211061, latest revision).

Oil Temperature Probe and Harness.

For information on Removal and Installation refer to,
Ref. Ext. Doc: Electronics International Inc. Glass Panel Engine Monitor MVP-50T (for Turboprops and Jets)
Installation Instructions (II-1211061, latest revision).

2. Adjustment and Test

(1) System Test.

Use the applicable E.I. Inc Field Test Device to test the wiring and correct operation of the components of the Oil
Temperature Indicating System.
Model. No. FCD-T-NIST: Temperature Signal.
Outputs a calibrated temperature signal and may be used to verify the system

(2) Calibration.

a. For field calibration of the Oil Temperature Indicating System from the temperature probe aft, use a Field
Calibration Device (FCD). These units provide a calibrated signal that may be used to verify the calibration
of the E.I. Inc. indication system.

Option 1.

NIST Traceable Field Calibration Device.
Model No. FCD-T-NIST: Temperature Signal. (Available from Electronics International Inc. - NIST certified)
Outputs a NIST calibrated temperature signal that simulates the thermocouple probe and harness. This can be
useful when performing flight tests or engine performance verification runs. The FCDs are traceable to NIST and
come with calibration paperwork.

Option 2.

Universal Field Calibration device.
Model No. FCD-TR-1. (Available from Electronics International Inc. - NIST certified)
Use this unit to provide a calibrated signal that may be used to verify the calibration of a given E.I. instrument.
This Bluetooth® field calibration device will allow wireless data retrieval, test and calibration for all engine
indication systems.

NOTE: NIST traceable calibration is an assurance program that certifies that a laboratory or manufacturer is
fully equipped to calibrate equipment to National Institute of Standards and Technology (NIST)
standards and that any products offered by that manufacturer will match those NIST-maintained
measurement standards.

b. Obey the instructions provided with the Electronics International Inc. FCD to field calibrate the C550GT Oil
Temperature Indicating System and the MVP-50T Glass Panel Engine Monitor.

Page 201

MAINTENANCE MANUAL SUPPLEMENT 77-40-06-Integrated Engine Instrument Systems
C550GT-AD016-FU24-0213
Integrated Engine Instrument Systems Revision: Initial Issue DATE: 01/01/2020

Description Description and Operation / Turbine Temp.(ITT)

Turbine Temp.(ITT) 77-40-06 Inter Turbine Temperature
Integrated Engine Instrument Systems
Description and Operation
Inter Turbine Temperature (ITT) - Description.

The Inter Turbine Temperature (ITT) probes and the Alumel/Chromel T5 engine harness is described in the P&WC
Maintenance Manual, Turboprop Gas Turbine Engine, Model PT6A-15AG Manual Part No. 3030442 (latest
revision).
The engine harness, which supplies an averaged millivolt temperature signal, terminates at the connection block
forward of the fuel manifold. See Figure 77.1

Wiring connects this output to the Engine Data Converter (EDC). The EDC converts the signal to a digital output
which can display on the main screen of the MVP-50T Engine Monitor Panel.
The MVP-50T uses a coloured arc gauge and a digital value in degrees Celsius (°C). The digital indication will
change colour when the ITT enters the cautionary range.
An engine ITT excursion over the preset temperature limit activates the annunciator
warning light and Master Caution Light.

(The configuration of the main screen display is still not defined; this paragraph
will be edited when more information is available)

Troubleshooting

a. For the engine terminal block aft, refer to Section 7.0 of the E.I. Inc. Installation Instructions for
troubleshooting procedures of the ITT System.

Ref. Ext. Doc: Electronics International Inc. Glass Panel Engine Monitor MVP-50T (for Turboprops and Jets)
Installation Instructions (II-1211061, latest revision).

NOTE: Use the applicable E.I. Inc Field Test Device to verify and troubleshoot system wiring and component
operation of the ITT Indicating System. Link to this section

b. For troubleshooting the engine’s ITT System probes, harness and applicable wiring, refer to the P&WC
Maintenance Manual.

Ref. Ext. Doc: P&WC Maintenance Manual, Turboprop Gas Turbine Engine, Model PT6A-15AG Manual Part No.
3030442 (latest revision).

c. For troubleshooting the aircraft’s ITT Indicating System wiring and connectors,
Ref. Dwg. No: AD-550GT-7700-001-201

Page 1

MAINTENANCE MANUAL SUPPLEMENT 77-40-06- Integrated Engine Instrument Systems
C550GT-AD016-FU24-0213
Integrated Engine Instrument Systems Revision: Initial Issue DATE: 01/01/2020

Inter Turbine Temperature Maintenance Practices / Inter Turbine Tempera-
Integrated Engine Instrument Systems

Maintenance Practices

1. Removal and Installation.

ITT Probes and Harness.

Refer to the P&WC Maintenance Manual for probe and harness Removal and Installation procedures.
Ref. Ext. Doc: P&WC Maintenance Manual, Turboprop Gas Turbine Engine, Model PT6A-15AG Manual Part No.
3030442 (latest revision).

NOTE: Refer to Chapter 77-20-01, T5 Indicating System, Maintenance Practices.

Engine Monitor Panel.

For Removal and Installation of the Monitor Panel and associated components,
Ref. Ext. Doc: Electronics International Inc. Glass Panel Engine Monitor MVP-50T (for Turboprops and Jets)
Installation Instructions (II-1211061, Latest Revision).

Figure 77.1 ITT Harness terminal block.

2. Adjustment and Test
(1) System Test
a. For ITT Probe testing, refer to the P&WC Maintenance Manual.
Ref. Ext. Doc: P&WC Maintenance Manual, Turboprop Gas Turbine Engine, Model PT6A-15AG Manual Part No.
3030442 (latest revision).
NOTE: Refer to Chapter 77-20-01, T5 Indicating System, Maintenance Practices.

Page 201

MAINTENANCE MANUAL SUPPLEMENT 77-40-06-Integrated Engine Instrument Systems
C550GT-AD016-FU24-0213
Integrated Engine Instrument Systems Revision: Initial Issue DATE: 01/01/2020

Maintenance Practices / Inter Turbine Tempera-

b. To verify and troubleshoot the ITT System wiring and component operation, use the applicable E.I. Inc Field
Test Device.

Model No. FCD-T-NIST: Temperature Signal

(2) Calibration.

a. There are two options for ITT System calibration:

Option 1.

Individual Field Calibration device.
Model No. FCD-T-NIST: Temperature Signal. (Available from Electronics International Inc. - NIST certified)

Use this field calibration device to calibrate the ITT System.

Option 2.

Universal Field Calibration device.
Model No. FCD-TR-1. (Available from Electronics International Inc. - NIST certified.)

This Bluetooth® field calibration device will allow wireless data retrieval, test and calibration for all engine
indication systems.

b. Obey the instructions provided with the Electronics International Inc. FCD to field calibrate the C550GT ITT
System and MVP-50T Glass Panel Engine Monitor.

NOTE: NIST traceable calibration is an assurance program that certifies that a laboratory or manufacturer is
fully equipped to calibrate equipment to National Institute of Standards and Technology (NIST)
standards and that any products offered by that manufacturer will match those NIST-maintained
measurement standards.

Page 202

MAINTENANCE MANUAL SUPPLEMENT 77-40-07-Integrated Engine Instrument Systems
C550GT-AD016-FU24-0213
Integrated Engine Instrument Systems Revision: Initial Issue DATE: 01/01/2020

Description Description and Operation / Torque Indicating

Torque Indicating
Integrated Engine Instrument Systems

77-40-07 Torque Indicating

Description and Operation

Torque Indicating System - Description
Ref. Dwg. No: AD-550GT-7700-001-201

Ref. Dwg. No: AD-550GT-7700-001-000

The Torque Indicating System shows the shaft horsepower produced by the engine.

The P&WC PT6A-15AG Turboprop Engine senses two pressures used to calculate engine torque. Torque oil
pressure produced by the hydro-mechanical unit and RGB housing static pressure. These pressures connect from
the RGB aft through hardlines to the forward fireseal baffle.

The C550GT Powerplant installation routes flexible hoses from the fireseal baffle to the two torque transducers
on the firewall.
The PT-30GA and PT-100GA Transducers mounted to the firewall bracket produce an electrical pressure signal.
The Engine Data Converter receives the data and then displays it on the Engine Monitor Panel.

The C550GT uses an arc gauge to show the amount of torque applied to the propeller.
This torque, in PSI, is displayed on the main screen of the Engine Monitor Panel.

(The configuration of the main screen display is still not defined; this paragraph
will be edited when more information is available. Caution/Warning lights and
Annunciator function will be shown in a separate section in Chp 77-40-00)

Troubleshooting

a. For troubleshooting the Torque Indicating System, refer to Section 7.0 of the MVP-50T Installation
Instructions.

Ref. Ext. Doc: Electronics International Inc. Glass Panel Engine Monitor MVP-50T (for Turboprops and Jets)
Installation Instructions (II-1211061, latest revision).

b. For troubleshooting a suspected fault in the PT6A-15AG Turboprop Engine torque pressure hydro-
mechanical unit, refer to the P&WC Maintenance Manual, 71-00-00 Powerplant, Adjustment and Test, para.
15 Torquemeter Function Test.

Ref. Ext. Doc: P&WC Maintenance Manual, Turboprop Gas Turbine Engine, Model PT6A-15AG Manual Part No.
3030442 (latest revision).

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MAINTENANCE MANUAL SUPPLEMENT 77-40-07- Integrated Engine Instrument Systems
C550GT-AD016-FU24-0213
Integrated Engine Instrument Systems Revision: Initial Issue DATE: 01/01/2020

Torque Indicating Maintenance Practices / Torque Indicating
Integrated Engine Instrument Systems

Maintenance Practices

1. Removal and Installation.

NOTE: There is no maintenance of the PT6A-15AG Turboprop Engine torque pressure hydro-mechanical unit
at field level.

Torque Pressure Pipes and Hoses.

Refer to the P&WC Maintenance Manual for pipe and flexible hose maintenance.
Ref. Ext. Doc: P&WC Maintenance Manual, Turboprop Gas Turbine Engine, Model PT6A-15AG Manual Part No.
3030442 (latest revision).

Engine Monitor Panel

For Removal and Installation of the Monitor Panel and associated components,
Ref. Ext. Doc: Electronics International Inc. Glass Panel Engine Monitor MVP-50T (for Turboprops and Jets)
Installation Instructions (II-1211061, latest revision).

2. Adjustment and Test

(1) System Test.
Use the applicable E.I. Inc Field Test Device to test the wiring and correct operation of the components of the
Torque Indicating System.
Model No. FCD-FP: Fuel/Oil Pressure Signal. (Used for Torque System Test)
Outputs a variable pressure signal (0 to 100+ PSI, 0-50 mV).

(2) Calibration.

a. For field calibration of the Torque System from the firewall aft, use a Field Calibration Device (FCD). These
units provide a calibrated signal that may be used to verify the calibration of the system.

Option 1.

NIST Traceable Field Calibration Device.
Model No. FCD-PRESS-NIST (Available from Electronics International Inc. - NIST certified)

Use this unit to provide a calibrated signal that may be used to verify the calibration of the system. This can be
useful when performing flight tests or engine performance verification runs. The FCDs are traceable to NIST and
come with calibration paperwork.

Option 2.

Universal Field Calibration device.
Model No. FCD-TR-1. (Available from Electronics International Inc. - NIST certified)
Use this unit to provide a calibrated signal that may be used to verify the calibration of a given E.I. instrument.
This Bluetooth® field calibration device will allow wireless data retrieval, test and calibration for all engine
indication systems.

NOTE: NIST traceable calibration is an assurance program that certifies that a laboratory or manufacturer is
fully equipped to calibrate equipment to National Institute of Standards and Technology (NIST)
standards and that any products offered by that manufacturer will match those NIST-maintained
measurement standards.

b. Obey the instructions provided with the Electronics International Inc. FCD to field calibrate the C550GT
Torque System and MVP-50T Glass Panel Engine Monitor.

Page 201

MAINTENANCE MANUAL SUPPLEMENT 77-40-08-Ng and Np Indicating
C550GT-AD016-FU24-0213
Ng and Np Indicating Revision: Initial Issue DATE: 01/01/2020

Description Description and Operation / Integrated Engine

Ng and Np Indicating
Integrated Engine Instrument Systems

77-40-08 Ng and Np Indicating

Description and Operation

Ng and Np System - Description

The Ng and Np Indicating System uses the signal outputs from the Ng Tachometer on the Engine Accessory
Gearbox (AGB) and the Np Tachometer on the Reduction Gearbox (RGB). Shielded wiring connects the
tachometer output to the Engine Data Converter (EDC).

The MVP-50T Glass Panel Engine Monitor uses arc gauges on
the main screen to display Ng speed in percentage and Np
speed in RPM or percentage values.

(The configuration of the main screen display is still not
defined; this paragraph will be edited when more
information is available. Caution/Warning lights and
Annunciator function will be shown in a separate section in
Chp 77-40-00)

Troubleshooting

a. For troubleshooting of the Ng and Np Indicating System from the applicable tachometers aft, refer to
Section 7.0 of the MVP-50T Installation Instructions.

Use the E.I. Inc. Field Calibration Device (FCD) to isolate the fault. Refer to the Adjustment and Test section this
chapter. Link to this section

Ref. Ext. Doc: Electronics International Inc. Glass Panel Engine Monitor MVP-50T (for Turboprops and Jets)
Installation Instructions (II-1211061, Latest Revision).

b. For wiring and connector information refer to the EDC-33T Interwiring electrical schematic.
Ref. Dwg. No: AD-550GT-7700-001-201

Figure 77.2 Ng and Np Tacho Generator locations

Page 1

MAINTENANCE MANUAL SUPPLEMENT 77-40-08- Integrated Engine Instrument Systems
C550GT-AD016-FU24-0213
Integrated Engine Instrument Systems Revision: Initial Issue DATE: 01/01/2020

Ng and Np Indicating Maintenance Practices / Ng and Np Indicating
Integrated Engine Instrument Systems

Maintenance Practices

1. Removal and Installation

Ng and Np Tachometer Generator Removal.
(1) Remove the engine top cowl. See Chp. 71 Engine Cowling
(2) Remove the electrical connector from the applicable Tachometer Generator.
(3) Remove the four nuts and washers from the base of the generator.
(4) Remove the tachometer generator from the engine accessory pad.

Ng and Np Tachometer Generator Installation.
(1) Fit a new gasket on the four studs of the engine accessory pad.
(2) Lubricate the drive shaft with an Anti-seize Compound (High Temperature).

NOTE: Refer to the Consumable Materials List in the P&WC Maintenance Manual, Turboprop Gas Turbine
Engine, Model PT6A-15AG Manual Part No. 3030442 (latest revision).

(3) Position the Tachometer Generator against the gasket on the pad.
NOTE: Make sure you position the electrical connector at the correct angle.

(4) Install the four washers and nuts. Torque nuts to 75-85 in lbs
(5) Reconnect the electrical connector.
(6) Install the top engine cowl. See Chp. 71 Engine Cowling

Engine Monitor Panel
(1) For Removal and Installation of the Monitor Panel and associated components,

Ref. Ext. Doc: Electronics International Inc. Glass Panel Engine Monitor MVP-50T (for Turboprops and Jets)
Installation Instructions (II-1211061, latest revision).

2. Adjustment and Test

(1) System Test.

Use the applicable E.I. Inc Field Test Device to verify and troubleshoot system wiring and component operation of
the Ng and Np Indicating System.
Model No. FCD-RPM: RPM Field Signal
Outputs a variable RPM signal (800 to 2800 RPM, 40 to l 40Hz, 18V pulse).

(2) Calibration.

a. For field calibration of the Ng and Np System from the (engine/firewall) aft, use a Field Calibration Device
(FCD). These units provide a calibrated signal that may be used to verify the calibration of a given E.I.
instrument.

Option 1.

NIST Traceable Field Calibration Device.
Model No. FCD-N1/N2-NIST: Tach Generator Signal. (Available from Electronics International Inc. - NIST
certified)
Outputs a NIST calibrated Tach Generator signal at 4200 RPM (70Hz). May be used to verify calibration of any
Electronics International N1 or N2 instrument.

NOTE: Use this unit to provide a calibrated signal that may be used to verify the calibration of the system.
This can be useful when performing flight tests or engine performance verification runs. The FCDs
are traceable to NIST and come with calibration paperwork.

Page 201

MAINTENANCE MANUAL SUPPLEMENT 77-40-08-Integrated Engine Instrument Systems
C550GT-AD016-FU24-0213
Integrated Engine Instrument Systems Revision: Initial Issue DATE: 01/01/2020

Maintenance Practices / Ng and Np Indicating

Option 2.

Universal Field Calibration device.
Model No. FCD-TR-1. (Available from Electronics International Inc. - NIST certified)

Use this unit to provide a calibrated signal that may be used to verify the calibration of a given E.I. instrument.
This Bluetooth® field calibration device will allow wireless data retrieval, test and calibration for all engine
indicating systems.

NOTE: NIST traceable calibration is an assurance program that certifies that a laboratory or manufacturer is
fully equipped to calibrate equipment to National Institute of Standards and Technology (NIST)
standards and that any products offered by that manufacturer will match those NIST-maintained
measurement standards.

b. Obey the instructions provided with the Electronics International Inc. FCD to field calibrate the C550GT Ng
and Np Indicating System and MVP-50T Glass Panel Engine Monitor.

Page 202

MAINTENANCE MANUAL SUPPLEMENT 78-00-00 - Exhaust System DATE: 01/01/2020
C550GT-AD016-FU24-0213 Revision: Initial Issue Exhaust System
Chapter 78

Title Page

Chapter 78
Exhaust System

Chapter 78 Exhaust

MAINTENANCE MANUAL SUPPLEMENT 78-00-00 - Exhaust System DATE: 01/01/2020
C550GT-AD016-FU24-0213 Revision: Initial Issue Exhaust System
Chapter Content

Chapter Content
Exhaust System

Chapter Contents

Chapter 78 Exhaust

Applicable Section Guide
78-10-00 Exhaust Stubs

Description and Operation
> Exhaust System

Components Changed By This STC

Maintenance Practices
Removal and Installation
> Exhaust Stub Removal.
> Exhaust Stub Installation.

Inspection and Check
> Exhaust Stub Visual Inspection

MAINTENANCE MANUAL SUPPLEMENT 78-00-00 - Manual to Use DATE: 01/01/2020
C550GT-AD016-FU24-0213 Revision: Initial Issue Manual to Use
Chapter Guide

Chapter Guide
Manual to Use

Applicable Section Guide MANUAL TO USE
SECTION / SUB-SECTION
N/A FU24- 954 C550GT
78-00-00 Exhaust System
Description and Operation 

PT6A-15AG Turboprop engine exhaust 
78-10-00 Exhaust Stubs
Description and Operation 

Exhaust Stubs (Collectors)
Maintenance Practices
Removal and Installation

Exhaust Stub Removal
Exhaust Stub Installation

Inspection and Check 
Exhaust Stub Visual Inspection

MAINTENANCE MANUAL SUPPLEMENT 78-10-00-Engine Exhaust System
C550GT-AD016-FU24-0213
Engine Exhaust System Revision: Initial Issue DATE: 01/01/2020

Engine Exhaust System Description and Operation / Exhaust
Exhaust
78-10-00 Exhaust Stubs
Exhaust System.
Description and Operation

Description and Operation

The exhaust system is simply a means of ducting the jet efflux to atmosphere clear of the engine compartment.
It is important that the direction and resultant thrust of the efflux minimises the effect of propeller torque.

The C550GT PT6A-15AG Turboprop engine exhaust has two stub pipes welded to two flanges. Each stub pipe is
secured to the engine exhaust flanges by 6 corrosion resistant nuts and bolts.

The C550GT Exhaust Stubs are positioned with the outlets long edge horizontal. The LH stub points down and
the RH stub points up.
This orientation of the exhaust stub outlets is important in balancing engine gas pressures. The engine power
turbine is rotating clockwise, as is the propeller, but the exhaust gas swirls opposite to the shaft rotation. The
Outlet direction helps in scavenging out exhaust gas to help create the optimum back-pressure.

Figure 78.1 Exhaust Stubs

Page 1

MAINTENANCE MANUAL SUPPLEMENT 78-10-00 - Components Changed Table
C550GT-AD016-FU24-0213
Components Changed Table Revision: Initial Issue DATE: 01/01/2020

Components Changed Table CCBTS / Exhaust System
Exhaust System

Components Changed By This STC

Drawing Number Item Part Number Description / Location

78-10-00 Exhaust Stubs

AD-550GT-7800-001-000 1 11-51087-1 Exhaust Stub RH

AD-550GT-7800-001-000 2 11-51087-2 Exhaust Stub LH

AD-550GT-7800-001-000 3 11-51089-1 Half Ring Packer

AD-550GT-7800-001-000 4 AN46CA Bolt

AD-550GT-7800-001-000 5 AN960-C416 Washer

AD-550GT-7800-001-000 6 MS21046C4 Nut

Page 1

MAINTENANCE MANUAL SUPPLEMENT 78-10-00- Exhaust System
C550GT-AD016-FU24-0213
Exhaust System Revision: Initial Issue DATE: 01/01/2020

Removal and Installation Maintenance Practices / Removal and Installation
Exhaust System

Maintenance Practices
Removal and Installation

1. Exhaust Stub Removal.
Ref. Dwg. No: AD-550GT-7800-001-000

See Figure 78.1
(1) Remove the engine cowling. See Chp. 71 Engine Cowling

NOTE: Use a Sharpie Permanent Marker (or equivalent) to index the stub to the engine flange for
reassembly.

(2) Remove the six nuts (6) washers (5) and bolts (4) that attach the Stub (2) to the engine flange.
NOTE: Support the stub as you do this, the doublers (3) are behind the flange, remove them with the bolts.

(3) Remove the exhaust stub from the engine.

2. Exhaust Stub Installation.
Ref. Dwg. No: AD-550GT-7800-001-000

See Figure 78.1
(1) Before you install the exhaust stub, examine the engine flange. See Chp. 78 Exhaust Stub Visual Inspection
(2) Support the Exhaust Stub (2) in position and correct orientation.

NOTE: Position the stub horizontal. LH side points down, RH side points up.
(3) Position the two doublers (3) and attach the stub (2) with six bolts (4) washers (5) and nuts (6).

NOTE: The doublers are aligned vertically and go behind the engine flange. The inside radius of the doubler
allows for the radius of the engine exhaust flange.

(4) Tighten the nuts gradually in a criss-cross sequence. Torque to 50-75 in lbs.

CAUTION: YOU CAN DAMAGE THE ENGINE FLANGE IF YOU OVERTORQUE THE EXHAUST STUB BOLTS.

NOTE: Use the correct bolt torque.
If the stub attach bolts/nuts are over torqued during installation, the engine exhaust flange deforms at the bolt/
washer location. This causes a gap between the engine flange and the exhaust stub flange. The loss of contact
area will reduce heat conductivity and prevent heat dissipating evenly from the flange. Localized heat stress can
cause cracks in the engine flange.

(5) Re install the engine cowling. See Chp. 71 Engine Cowling

Page 401

MAINTENANCE MANUAL SUPPLEMENT 78-10-00- Exhaust System
C550GT-AD016-FU24-0213
Exhaust System Revision: Initial Issue DATE: 01/01/2020

Maintenance Practices / Inspection and Check

Inspection and Check
Exhaust System

Inspection and Check

Exhaust Stub Visual Inspection

(1) Examine the exhaust stubs for signs of cracks and distortion.

(2) Carefully examine the welded flanges and outer lip.

Result

a. If you find a crack in the exhaust stub, contact CAC for support.
b. Cracks can be weld repaired. Use welding rod 347 (AMS 5680)

NOTE: The exhaust stub must be removed for repair.

Page 601

MAINTENANCE MANUAL SUPPLEMENT 79-00-00 - Engine Oil System
C550GT-AD016-FU24-0213
Chapter 79 Revision: Initial Issue DATE: 01/01/2020

Title Page Engine Oil System

Engine Oil System
Chapter 79

Chapter 79 Engine Oil System

MAINTENANCE MANUAL SUPPLEMENT 79-00-00 - Engine Oil System
C550GT-AD016-FU24-0213
Chapter Contents Revision: Initial Issue DATE: 01/01/2020

Chapter Contents Engine Oil System
Engine Oil System

Chapter Contents

Chapter 79 Engine Oil System

Applicable Section Guide
79-00-00 Oil
Description and Operation
> C550GT Oil Cooler.

Components Changed By This STC
Maintenance Practices

Removal and Installation
> Oil Cooler Removal
> Oil Cooler Installation
Inspection and Check
> Oil Cooler Inspection.
79-30-00 Oil Indicating
Description and Operation
> Oil Indicating System

79-30-01 Annunciators
Description and Operation
> Annunciators

MAINTENANCE MANUAL SUPPLEMENT 79-00-00 - Manual to Use DATE: 01/01/2020
C550GT-AD016-FU24-0213 Revision: Initial Issue Manual to Use
Chapter Guide
MANUAL TO USE
Chapter Guide
Manual to Use N/A FU24- 954 C550GT

Applicable Section Guide 
SECTION / SUB-SECTION

79-00-00 Engine Oil System
Description and Operation

Oil Cooler System
Troubleshooting

Maintenance Practices 

Removal and Installation
Oil Cooler Removal
Oil Cooler Installation

Inspection and Check 
Oil Cooler System

79-30-00 Indicating 
Description and Operation 

Oil Indicating System
MVP-50T configuration 
Annunciators
Maintenance Practices
Removal and Installation
Reference to MVP-50T ICA

MAINTENANCE MANUAL SUPPLEMENT 79-00-00-Oil Cooler
C550GT-AD016-FU24-0213
Oil Cooler Revision: Initial Issue DATE: 01/01/2020

Engine Oil System Description and Operation / Engine Oil System
Oil Cooler

79-00-00 Oil

Description and Operation

Description and Operation

Applicable Manuals

This chapter of the CMMS will show the Engine Oil Systems and components that are considered part of the
airframe.
The P&WC Maintenance Manual, Turboprop Gas Turbine Engine, Model PT6A-15AG Manual Part No. 3030442
(latest revision). Chapter 79-00-00 - Oil System, provides Description and Operation, System Schematic,
Troubleshooting, Removal, Installation, Adjustment and Test information and procedures for all parts of the Oil
System of the engine.

C550GT Oil Cooler.

Used Oil is scavenged from the Reduction Gearbox (RGB) and the Accessory Gearbox (AGB) by two double-
element gear type pumps at the rear of the engine. (See P&WC Maintenance Manual 79-00-00, Figure 1). The oil
from the outlet of the two pump elements is pumped through a flexible hose to the inlet port of the Oil Cooler.
The outlet housing at the base of the cooler has a vernatherm oil by-pass valve. Cooled oil is returned through a
flexible hose to the inlet deaerator at the top of the AGB.

The Oil Cooler mounts to the RH side of the firewall. A fibreglass Inlet Duct receives ram air from a NACA air inlet
on the LH side of the bottom cowl. Air is forced across the heat exchanger matrix and collected by the Outlet
Duct. The fibreglass outlet duct turns the airflow 90° to exit down and out the rear of the engine cowling.

One of the design advantages of the lower cowl NACA inlet is low aerodynamic drag. However, when the C550GT
is taxiing or is parked with the engine running and the propeller feathered, the air inlet NACA scoop is inefficient.

To help prevent an increase in engine oil temperature during this operational phase, the oil cooler airflow is
augmented by discharge from the engine’s Bleed Off Valve (BOV). The PT6A-15AG engine has an Air Bleed Case
that collects the BOV exhaust and ducts this airflow into the oil cooler Outlet Duct. Venturi effect produced by
this discharge induces airflow into the cowls NACA inlet which creates sufficient cross-matrix airflow to cool the
oil.

Figure 79.1 Oil Cooler Components

Page 1

MAINTENANCE MANUAL SUPPLEMENT 79-00-00 - Components Changed Table
C550GT-AD016-FU24-0213
Components Changed Table Revision: Initial Issue DATE: 01/01/2020

Components Changed Table CCBTS / Oil System
Oil System

WORK IN PROGRESS

Components Changed By This STC

Drawing Number Item Part Number Description / Location
Oil Cooler
AD-550GT-7900-001-000 1 08-04067-1 Inlet Duct
AD-550GT-7900-001-000 2 08-04069-1 Exit Duct
AD-550GT-7900-001-000 3 08-04069-12 Elbow
AD-550GT-7900-001-000 4 08-04069-15 Strap
AD-550GT-7900-001-000 5 08-04069-18 Partition
AD-550GT-7900-001-000 6 08-04069-6 Tube
AD-550GT-7900-001-000 7 08-59003-11 Seal
AD-550GT-7900-001-000 8 08-59003-12 Seal
AD-550GT-7900-001-000 9 156F005-12D-0390 Hose, Return
AD-550GT-7900-001-000 10 156F005-12D-0515 Hose, Supply
AD-550GT-7900-001-000 24 L8538233 Oil Cooler (Heat Exchanger)

Oil Indicating

Page 1

MAINTENANCE MANUAL SUPPLEMENT 79-00-00- Oil Cooler
C550GT-AD016-FU24-0213
Oil Cooler Revision: Initial Issue DATE: 01/01/2020

Removal and Installation Maintenance Practices / Removal and Installation
Oil Cooler

Maintenance Practices
Removal and Installation

1. Oil Cooler Removal
Ref. Dwg. No: AD-550GT-7900-001-000
(1) Remove the engine cowling. See Chp. 71 Engine Cowling
(2) Install the protective cover over the Air Intake screen.

CAUTION: IF ANY OBJECT FALLS INTO THE ENGINE COMPRESSOR INLET, ALL WORK MUST CEASE UNTIL
THE OBJECT IS RECOVERED.

(3) Loosen the clamp (23) and remove the bleed air hose (30).
NOTE: Cap the hose to prevent contamination.

(4) Drain the oil from the oil cooler (24).
(5) Remove the Inlet Duct (1).
(6) Remove the Outlet Duct (2).
(7) Disconnect the oil inlet hose (9) and outlet oil hose (10).

NOTE: Cap and identify the hoses for reassembly.
(8) Remove the Oil Cooler from the firewall bracket.

Figure 79.2 Oil Cooler Installation

Page 401

MAINTENANCE MANUAL SUPPLEMENT 79-00-00-Oil Cooler
C550GT-AD016-FU24-0213
Oil Cooler Revision: Initial Issue DATE: 01/01/2020

Maintenance Practices / Removal and Installation

2. Oil Cooler Installation
Ref. Dwg. No: AD-550GT-7900-001-000
(1) Attach the oil cooler to the firewall bracket.
(2) Connect the oil inlet hose (9) and outlet oil hose (10).
(3) Install the Outlet Duct (2).
(4) Install the Inlet Duct (1).
(5) Install the bleed air hose (30) with the clamp (23).
(6) Remove the protective cover from the Air Intake screen.

CAUTION: KEEP THE INLET AREA CLEAR OF ALL FOREIGN OBJECTS THAT COULD BE INGESTED BY THE
ENGINE DURING SUBSEQUENT OPERATION.

(7) Dry Motor the engine to bleed the Oil Cooler and purge any trapped air.
NOTE: Refer to General Engine Testing and Checks. See Chp. 71 General Engine Testing and Checks

(8) Ground run the engine and check for oil leaks.
NOTE: Refer to General Engine Testing and Checks. See Chp. 71 General Engine Testing and Checks

Refer to the Crusader 550GT Approved Flight Manual Supplement STC 14/21E/5.

Page 402

MAINTENANCE MANUAL SUPPLEMENT 79-00-00- Oil Cooler
C550GT-AD016-FU24-0213
Oil Cooler Revision: Initial Issue DATE: 01/01/2020

Inspection and Check Maintenance Practices / Inspection and Check
Oil Cooler
Inspection and Check
1. Oil Cooler Inspection.

(1) Examine the oil cooler matrix for obstructions, damage and signs of oil leakage.
NOTE: If necessary, remove the oil cooler and leak test it.

(2) Examine the Inlet and Outlet Ducts for chafe, cracks and loose fasteners.
(3) Examine the Outlet Duct. Look up inside the duct and make sure the BOV inlet tube is secure.
(4) Carefully examine the SCAT ducting that connects the Air Bleed Case elbow to the oil cooler Outlet Duct

elbow. Make sure the SCAT duct is in good condition. If you find damage to the SCAT duct lining or wire coils,
replace the duct.

WARNING: THE DUCTING AND ELBOWS ARE CRITICAL TO THE OPERATION OF THE ENGINE. AN
OBSTRUCTION IN THE DUCT CAN RESTRICT THE AIRFLOW AND DISRUPT THE FLOW OF AIR
FROM THE BLEED OFF VALVE. THIS CAN AFFECT OVERALL ENGINE PERFORMANCE.

Figure 79.3 Oil Cooler System-Inspection
Page 601

MAINTENANCE MANUAL SUPPLEMENT 79-30-00-Description and Differences
C550GT-AD016-FU24-0213
Description and Differences Revision: Initial Issue DATE: 01/01/2020

Description and Differences Description and Operation / Oil Indicating System
Oil Indicating System

79-30-00 Oil Indicating

Description and Operation

1. Oil Indicating System
WORK IN PROGRESS. Awaiting more information from ADL re: MVP-50T configuration

Page 1

MAINTENANCE MANUAL SUPPLEMENT 79-30-01-Oil System Annunciators
C550GT-AD016-FU24-0213
Oil System Annunciators Revision: Initial Issue DATE: 01/01/2020

Oil System Annunciators Description and Operation / Oil Indicating
Oil Indicating

79-30-01 Annunciators

Description and Operation

1. Annunciators
WORK IN PROGRESS. Awaiting more information from ADL re: MVP-50T configuration

Page 1

MAINTENANCE MANUAL SUPPLEMENT 80-00-00 - Starting DATE: 01/01/2020
C550GT-AD016-FU24-0213 Revision: Initial Issue Starting
Chapter 80

Title Page

Chapter 80
Starting

Chapter 80 Starting

MAINTENANCE MANUAL SUPPLEMENT 80-00-00 - Starting DATE: 01/01/2020
C550GT-AD016-FU24-0213 Revision: Initial Issue Starting
Chapter Contents

Chapter Contents
Starting

Chapter Content

Chapter 80 Starting

Applicable Section Guide
80-10-00 Starting

Description and Operation
> Starting -Description
> Starting -Operation

Components Changed By This STC

Troubleshooting
> Troubleshooting Chart
80-10-00 Starter Generator
Maintenance Practices
Removal and Installation
> Starter Generator Removal
> Starter Generator Installation.

MAINTENANCE MANUAL SUPPLEMENT 80-00-00 - Manual to Use DATE: 01/01/2020
C550GT-AD016-FU24-0213 Revision: Initial Issue Manual to Use
Chapter Guide

Chapter Guide
Manual to Use

Applicable Section Guide MANUAL TO USE
SECTION / SUB-SECTION
N/A FU24- 954 C550GT
80-00-00 Starting
80-10-00 Cranking 
Description and Operation 

Start System 
Starter Generator 
Start System Circuit Breaker
Starter Relay 
Starter Switch
Troubleshooting
Starter Generator Troubleshooting Table

Maintenance Practices 

Removal and Installation 
Starter Generator Removal 
Starter Generator Installation
Terminal connections
Driveshaft Alignment

MAINTENANCE MANUAL SUPPLEMENT 80-10-00-Engine Cranking components
C550GT-AD016-FU24-0213
Engine Cranking components Revision: Initial Issue DATE: 01/01/2020

Description and Operation / Starting

Description and Operation

Engine Cranking components
Starting

80-10-00 Starting

Description and Operation

Starting -Description

The PT6A-15AG Engine Starting System has a start circuit breaker, start switch, start relay, starter generator and
related wiring.

NOTE: The starter generator and starter switch are also component parts of the DC Generation and Ignition
systems. See Chp. 24 and See Chp. 74

The starter switch energises the ignition and engine starting circuits simultaneously and connects power to the
start-circuit terminal of the Auxilec GCU. The GCU controls field excitation to the Starter Generator and has
internal switching that will ‘open circuit’ the shunt field of the generator allowing it function as a starter motor.

NOTE: When you motor the engine for maintenance reasons, set the ignition switch to OFF to isolate the
ignition circuit, unless a procedure says differently.

Releasing the starter button removes power to the GCU and the starter generator changes to generate mode.

Start System Components

Starter Generator

The Skurka Aerospace Inc. (Aircraft Parts Corporation) starter/generator, rated at 28 VDC and 250A, attaches
using an adapter housing to the rear upper face of the engine accessory/reduction gearbox module. It is a
conventional four pole shunt-field generator with inter-poles and series auxiliary start windings. A built-in fan
cools the unit.

Figure 80.4 Starter Generator and Adapter
Start Circuit Breaker

The start circuit breaker is a 5A manual trip/reset type positioned in the Circuit Breaker and Switch panel.
Start By-Pass Relay

The Start Bypass Relay is installed on the battery box and has two modes of operation. In bypass mode it
supplies 24 VDC to the Primary bus through the 100 Amp Main Power loop. During engine start, the Starter
Generator load is much higher and this current passes through the main contacts of the Start Bypass Relay. This
system design is a safety feature. It removes a potential fire hazard from the cockpit when the high-current
engine start-load is not in use.
Starter Relay

The starter relay is the same type as the generator relay and is mounted on the front LH side of the firewall.
Starter Switch

The starter switch is a push button type switch in the knob of the condition lever.
Starting -Operation
The Start Button is a momentary ON switch. When pressed, it supplies power from the 5A START circuit breaker
to energise the Start By-Pass Relay and Start Relay simultaneously. This supplies power to the START terminal of
the Starter Generator causing the starter to begin cranking. The Start Button must be held for the Starter to
continue to motor the engine.

Page 1

MAINTENANCE MANUAL SUPPLEMENT 80-10-00-Engine Cranking components
C550GT-AD016-FU24-0213
Engine Cranking components Revision: Initial Issue DATE: 01/01/2020

Description and Operation / Starting

Releasing the Start Button, de-energises the Start Relay and the Start By-Pass Relay and removes power to the
Starter. The Starter Generator now reverts to the generate mode and supplies output voltage through control
relays to the Primary Bus.

NOTE: For a detailed Description and Operation of the DC Generation System. See Chp. 24 Electrical System
Operation

Page 2

MAINTENANCE MANUAL SUPPLEMENT 80-10-00 - Components Changed Table
C550GT-AD016-FU24-0213
Components Changed Table Revision: Initial Issue DATE: 01/01/2020

Components Changed Table CCBTS / Starting System
Starting System

Components Changed By This STC

Drawing Number Item Part Number Description / Location
Start System
AD-550GT-2430-001-000 2 150SG1108 Clamp Ring (Adapter)
AD-550GT-2430-001-000 3 250SG111Q-1 Starter Generator
AD-550GT-2430-001-000 17 MS24171 Start Relay
AD-550GT-2430-001-001 2CB5 MS3320-5 Circuit Breaker
AD-550GT-2430-001-001 2S2 MS25089-4CR Start Switch

Page 3

MAINTENANCE MANUAL SUPPLEMENT 80-10-00 - Starter Generator
C550GT-AD016-FU24-0213
Starter Generator Revision: Initial Issue DATE: 01/01/2020

Troubleshooting / Generation System

Troubleshooting / Generation System
Starter Generator

Troubleshooting

Troubleshooting Chart

Table 80(a) Start Generator Troubleshooting

TROUBLE PROBABLE CAUSE ACTION

Abnormal vibration and noise. a) Fan blades contacting the cover. a) Check fan and cover. Replace the
b) Rear bearing fault. faulty parts.
STARTER b) Replace with Serviceable unit.
Starter does not turn engine.
a) Wiring failure at the Starter a) Repair the damaged wiring or
Generator terminal block. terminals.

b) Torque shaft is broken. b) Replace the Starter Generator.

When an engine start is attempted, c) Brushes are worn. c) Replace the Starter Generator
the Starter does not turn at a normal a) Brushes are worn. a) Check the brush wear and replace
speed and does not deliver torque. brushes that are outside tolerance.
b) Partial short circuit. b) Replace the Starter Generator
Higher power consumption than a) Short circuit in the stator a) Replace the Starter Generator
normal during engine start.
a) Torque shaft is broken. a) Replace the Starter Generator.
GENERATOR b) Shunt winding shorted or broken. b) Replace the Starter Generator.

Generator section does not supply
voltage.

c) Faulty G.C.U. c) Replace the G.C.U.

Page 101

MAINTENANCE MANUAL SUPPLEMENT 80-10-00- Starter Generator
C550GT-AD016-FU24-0213
Starter Generator Revision: Initial Issue DATE: 01/01/2020

Removal & Installation Maintenance Practices / Removal & Installation
Starter Generator

80-10-00 Starter Generator

Maintenance Practices

Removal and Installation

1. Starter Generator Removal
Ref. Dwg. No: AD-550GT-2430-001-000
(1) Make sure all electrical power is OFF.
(2) Placard the master switch. ‘DO NOT OPERATE’.
(3) Remove the upper half of the engine cowl. See Chp. 71 Engine Cowling
(4) Disconnect wires P17C, P17B, P7A, P8A, P16B and P15B at the start/generator terminals.
NOTE: Identify the wires with tags before you remove them.

Figure 80.5 Start/Gen.Terminal Connections
Page 401

MAINTENANCE MANUAL SUPPLEMENT 80-10-00-Starter Generator
C550GT-AD016-FU24-0213
Starter Generator Revision: Initial Issue DATE: 01/01/2020

Maintenance Practices / Removal & Installation

CAUTION: IN THE NEXT STEP, DO NOT ALLOW THE WEIGHT OF THE START/GEN TO HANG ON THE DRIVE
SHAFT. THIS WILL DAMAGE THE SHAFT.

(5) Loosen band clamp (2) that attaches the starter generator to the mounting pad.
(6) Remove the starter/generator (3)

NOTE: To protect the shaft, store the generator on blocks with the drive-end down.

Figure 80.6 Gen.Clamp Installation

2. Starter Generator Installation.
Ref. Dwg. No: AD-550GT-2430-001-000
Drive Shaft Alignment.
CAUTION: THE DRIVE SHAFT MUST STAY ALIGNED AND CONCENTRIC TO THE ARMATURE.
The drive shaft can be off centre and out of position due to mishandling during shipping or installation. If you
install the starter-generator with the drive shaft out of position, excessive vibration and damage can occur during
operation.
Before installation of the starter-generator on an engine, carefully inspect the drive shaft and dampener plate
assembly. If the drive shaft is out of position, lightly tap on the drive shaft spline, using a plastic mallet to move
it back into a full concentric position. See Figure 80.7

a) Wet Spline
Lubricate spline and seal with Engine oil.

(b) Dry Spline
Lubricate spline with a lubricant approved by P&WC.
CAUTION: IN THE NEXT STEP, DO NOT ALLOW THE WEIGHT OF THE START/GEN TO HANG ON THE DRIVE

SHAFT. THIS WILL DAMAGE THE SHAFT.
(1) Position the Start/Generator up to the mounting pad and carefully insert the drive shaft.
(2) Place the clamp (2) around the generator and mounting pad. Tighten the clamp to 70 in lbs.
(3) Connect wires P17C, P17B, P7A, P8A, P16B and P15B at the start/generator terminals.
(4) Install the upper half of the engine cowl. See Chp. 71 Engine Cowling
Do a Starter Generator Function Test. See Chp. 24 Generator System Functional Test

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MAINTENANCE MANUAL SUPPLEMENT 80-10-00-Starter Generator
C550GT-AD016-FU24-0213
Starter Generator Revision: Initial Issue DATE: 01/01/2020

Maintenance Practices / Removal & Installation

Figure 80.7 Generator Driveshaft Alignment
Page 403