7588561GF New FAA PMA

MTR5078
Issue 2

er DHC plots

18 of 24
Confidential.
vair Filtration Group Ltd.

MTR5078
Issue 2

10.3.2 Dirt holding capacity and efficiency discussion

The results presented do not include the identified factors per this report. It is deemed acceptable to
ignore these due to the significant increase in PFG element performance when compared to PTI filter
element 758856. It must also be noted that this test was performed at 100LPM due to PFG’s internal
rig capability.

PFG filter element displays a slight reduction in efficiency performance when compared to the
incumbent; the values are both above beta 200 (99.5%), which is recognised as an absolute filtration
rating for this type of filter.

11 DIFFERENTIAL COLLAPSE ANALYSIS

The following analysis has been conducted to demonstrate PFG filter element MA0902411 meets the
minimum differential pressure requirements of 500psid at 135°C.

The filter core is constructed from 6082-T6 Aluminium Alloy, with a standard 60° triangular pitch.

Core outside diameter → 43.6mm
Core inside diameter → 40.6mm
Length → 226.65mm
Wall thickness → 1.50mm
Hole diameter → 3.00mm (c)
Hole pitch → 5.00mm (d)

3
" / $$ / : → 1 & 1 5 0.40

:" /& " ## $ A& 40.6
/ → 1.5 27.0666 ( ℎ / 0 "" &+

25! 3 " / 0 "" ℎ C/ ## C 0.40 1.50 0.6

=6 3.48 101 43.6 10* 126.44 =
D max 2
2 0.6 10*

D" 3.48 101 43.6 10* 63.22 =

4 0.6 10*

Material properties for 6082-T6 aluminium alloy derived from MMPDS-01 table 3.6.2.0(b1) 6061-T6
material. Refer appendix D.

D: 241 =
Material de-rated per MMPDS-01 figure 3.6.2.2.1(a) 1000 hour curve.

D: 241 0.82 197.6 =
Von mises yield criteria,

(D1 D2+' + (D2 D3+' + (D3 D1+' ≤ 2D:'

(126.44 63.22+' + (63.22 0+' + (0 126.44+' 2 197.6'
23980.6 78091.5

Page 19 of 24
Company Confidential.

© Copyright 2017. Porvair Filtration Group Ltd.

MTR5078
Issue 2

Von mises stress → 23980.6
Safety factor → 2 11990.3 √11990.3 109.5 =
197.6
109.5 1.8

Consider buckling due to uniform external pressure.
E (young’s modulus) → 70GPa

>' ' 2> 2 R62 ′ ′
A 60 < K L MN O < 2.5 MN O NP2Q R62 ′ ′,

226.65 ' 21.8 21.8 ' &
60 < K 21.8 L K 0.6 L < 2.5 K 0.6 L 60 < 3927 < 3300.27 ∴

=V 2∗ ∗M O [ 1 ' % ' 'Y`
∗ Y + 0.0916 ∗ K L \1 + M > O ]

1 + M12O M%> ' YZ\1 + M%> '' Y_
X ^
O O]

=a 70 10b 0.4 M00..00021185O e1 + 0.0015 ' % 0.0218 ' 'h
1 + M21O M%0 .2 02.0626158O' 0.0916 K0.0218L 81 + K 0.22665 L 9 g
d M%0 .2 02.0626158O'9'
81 + f

c

=a 14.018 = 2033?#
No buckling failure will occur when subjected to an external differential pressure of 500psid.

12 CONCLUSION

The testing and analysis conducted in this report demonstrates comparable performance with the
incumbent filter element, noting the slight reduction in filtration efficiency.. The filter mass increase will
need to be considered when incorporated into the filter housing.

Page 20 of 24
Company Confidential.

© Copyright 2017. Porvair Filtration Group Ltd.

*OREDO)LOWUDWLRQ

'HVLJQ0HWKRGRORJ\

*OREDO)LOWUDWLRQ,QF/ Porvair Filtration HYDOXDWHG22(0VDPSOHVWR
GHWHUPLQHGLPHQVLRQVDQGWROHUDQFHVIRU317588561*)

‡ (DFK)LOWHUZDVH[DPLQHGIRUZRUNPDQVKLSDQGYLVLEOHGHIHFWVEHIRUH
PHDVXUHPHQW
‡ 'LPHQVLRQVZHUHGHWHUPLQHGE\DYHUDJLQJWKHUDQJHRIGLPHQVLRQVDFTXLUHGGXULQJ
LQVSHFWLRQ7ROHUDQFHVZHUHGHWHUPLQHGIURPDSSOLFDEOHPDQXIDFWXULQJDQGPDFKLQLVWSUDFWLFHV

‡ (DFK2(0VDPSOHLVGLPHQVLRQDOO\LQVSHFWHGXVLQJDFDOLEUDWHG&00RUKDQGKHOG
LQVSHFWLRQWRRO7KHGLPHQVLRQVDUHGRZQORDGHGWR,*6&$'SURJUDP$XWR'HVN0DVWHU3URJUDP
7KHPDFKLQHVKRSWKHQGRZQORDGVWKHGLPHQVLRQVWRWKHDVVLJQHGPDFKLQH

‡ 7KH*OREDO)LOWUDWLRQ,QF/ Porvair )LOtrationVHOHFWHGPDWHULDOVWKDWZHUHH[DFWO\PDWFKHGZLWKWKH2(0HOHPHQW
EXWWKHPHGLD XVHGZDVDEHWWHUHIILFLHQF\DOORZLQJIRUFOHDQHUDLUDQGEHWWHURYHUDOOSHUIRPDQFH See Below:

Test Fluid H2O Reference Specific Density Kinematic Dynamic
viscosity (cst) Viscosity
MIL-PRF-5606 Density @ 60°F gravity (Kg/m^3)
Skydrol LD4 17 (Pa.s)
(Kg/m^3) 15
0.0141
999.2 0.83 829.336 0.0148

999.2 0.99 989.208

Table 2 – Fluid property table

‫ݎ݋ݐܿܽܨ‬ ൌ ‫ݏ‬Ǥ ݃ሺ‫ܦܮ‬Ͷሻ ‫ݔ‬ ‫ݒ‬ሺ‫ܦܮ‬Ͷሻ ൌ ͲǤͻͻ ‫ݔ‬ ͳͷ ൌ ͳǤͲͷʹͶ
‫ݏ‬Ǥ ݃ሺ‫ܦܮ‬Ͷሻ ‫ݒ‬ሺͷ͸Ͳ͸ሻ ͲǤͺ͵ ͳ͹

7.3 Dirt holding capacity & efficiency

This test will be used to demonstrate compliance with both the efficiency and dirt holding capacity
requirements defined in paragraph two. This test will be carried out in accordance with ISO16889.

7.4 Equipment Preparation
This test shall be carried out using MIL-PRF-5606 as the working fluid.

Connect the filter assembly to test rig PM1044. Fit particle counters immediately upstream
and downstream of the filter assembly.

Use a data logging system to continually record the differential pressure and oil temperature
throughout the test.

7.5 Test Procedure

With the flow rate at 100litres/min inject 10mg/l of ISO 12103 medium test dust with the
particle distribution shown in table 3.

DIMENSIONAL ANALYSIS(Mean Avg)- 7588561GF # W/Corresponding
OEM PN 7588561 Drawing
Illustration
PMA DIMS JUSTIFICATION FOR TOLERANCE RANGE
Ø3.67" M111598 Open End Cap
Outside Diameter mates to the ducting/flange M111598 Open End Cap
1.39" Outside/ Center Flange
.648" Length of open end cap top flange M111598 Open End Cap
0.99" Inside opening to center cross support M111598 Open End Cap
3.67" Outside Dims M111600 Closed End Cap
M111600 Closed End Cap
0.31" Lip Dims along end cap surface M111600 Closed End Cap
Lenth and OD of end cap top flange M111600 Closed End Cap
0.88" Closed End cap top flange Length MA0902411 Filter Length
1.77"
1.41" End to End Measurementof overall Length

10.61"

OEM DIMS JUSTIFICATION FOR TOLERANCE RANGE Reference # Part No.
Ø3.65"
Outside Diameter mates to the ducting/flange 7364053902 Open End Cap
1.39"
Outside/ Center Flange 7364053902 Open End Cap
.648" Length of open end cap top flange
0.96" Inside opening to center cross support 7364053902 Open End Cap
Outside Dims 7364053902 Open End Cap
3.67" Lip Dims along end cap surface 7364053902 Closed End Cap
0.27" Lenth and OD of end cap top flange
Closed in cap top flange Length 7364053902 Closed End Cap
0.90" End to End Measurementof overall Length 7364053902 Closed End Cap
1.79"
1.41" 7364053902 Closed End Cap
10.60" 7364053902 Filter Length

RC

5/2/17

RC

5/2/17

RC 5/2/17





RC 5/2/17

RC 5/2/17



RC 5/2/17



Global Filtration, Inc. – List of Revisions
Part No. 7588561GF Drawing
Drawing: DRAWING No. /Part No. 7588561GF Rev IR Dated 1/23/2017 _________
FAA-PMA Project Number- ________ PM02592AC-T________________________

List of Revisions

Revision Revision Description Approved by: Release Date
Number
INITIAL REVISION DRAWING RC 1/23/17
IR 03/13/17
0 Changed Drawing to MA0902411 REV 0 RC
4/13/17
0A dated 03/13/17. Included all component sheets

and Bill of Materials

Changed Diminsions from Metric system to RC
US Inches

0B Change PN from GF7588561 to 7588561GF RC 5/2/17
Added Production Approval Holder to each
Page for approval (PAH)











Printed Date: 24/01/17

MTR5061 – Issue 2

PERFORMANCE EVALUATION ANALYSIS
BOEING 737 RETURN LINE FILTER
ELEMENTS.

Porvair Filtration P/N MA0902411 (SK0892)

Programme: Boeing 737

Prepared for: Southwest Airlines

Signature Date

Compiled by:

J Ayers
Applications Engineer, Aerospace
Engineering Approval:

P Nicholson
Account Manager, Aerospace

World Class Filtration Solutions

MTR5061
Issue 2

Project Details Porvair Filtration Group Ltd.
Manufacturer: 1 Concorde Close
Segensworth
Subject item: Fareham
Prepared for: Hampshire
PO15 5RT
UK

Tel: +44 (0)1489 864330
Fax: +44 (0) 1489 864399
www.porvairfiltration.com

Boeing 737 Return Line Hydraulic Filter Elements

Southwest Airlines

Page 2 of 15
Company Confidential.

© Copyright 2017. Porvair Filtration Group Ltd.

MTR5061
Issue 2

Table of Amendments

Issue Issue Amendment History Page Author
1 Date Number
2 Jan 2017 Initial Issue
Table 5 amended to correct pressure loss results - J.Ayers
Jan 2017 Table 6 amended to correct Beta ratios
10
J. Ayers

12

Page 3 of 15
Company Confidential.

© Copyright 2017. Porvair Filtration Group Ltd.

MTR5061
Issue 2

Table of Contents

1 SCOPE....................................................................................................................................................... 5
2 SPECIFICATION ......................................................................................................................................... 5
3 APPLICABLE DOCUMENTS......................................................................................................................... 5
4 FILTER ELEMENT DESIGN .......................................................................................................................... 5

4.1 PFG FILTER ELEMENT ................................................................................................................................... 5
4.2 INCUMBENT FILTER ELEMENT - 7588561......................................................................................................... 6
5 TEST PLAN ................................................................................................................................................ 6
6 TEST CONDITIONS..................................................................................................................................... 6

6.1 STANDARD TEST CONDITIONS......................................................................................................................... 6
6.2 GENERAL TEST CONDITIONS ........................................................................................................................... 7

6.2.1 Ambient Conditions ......................................................................................................................... 7
6.2.2 Test Medium.................................................................................................................................... 7
6.2.3 Test Fluid Temperature ................................................................................................................... 7
6.2.4 Tolerance of Test Conditions ........................................................................................................... 7
6.2.5 Accuracy of Test Equipment ............................................................................................................ 7
6.3 DATA REQUIREMENTS................................................................................................................................... 7
6.3.1 Laboratory Data .............................................................................................................................. 7
6.3.2 Specific Data.................................................................................................................................... 7
6.3.3 Test Log ........................................................................................................................................... 8
6.4 INSPECTION AND TEST EQUIPMENT.................................................................................................................. 8
6.4.1 Inspection Equipment...................................................................................................................... 8
6.4.2 Test Equipment................................................................................................................................ 8
6.4.3 Calibration of Instrumentation........................................................................................................ 8
7 TEST PROCEDURE ..................................................................................................................................... 8
7.1 DRY MASS................................................................................................................................................... 8
7.2 CLEAN DIFFERENTIAL PRESSURE ....................................................................................................................... 8
7.2.1 Test Procedure................................................................................................................................. 8
7.3 DIRT HOLDING CAPACITY & EFFICIENCY ............................................................................................................. 9
7.4 EQUIPMENT PREPARATION............................................................................................................................. 9
7.5 TEST PROCEDURE ......................................................................................................................................... 9
7.6 TEST REQUIREMENT ...................................................................................................................................... 9
8 TEST RESULTS ......................................................................................................................................... 10

8.1 DRY MASS ................................................................................................................................................ 10
8.2 CLEAN FLOW DIFFERENTIAL PRESSURE............................................................................................................. 10

8.2.1 Clean pressure loss summary ........................................................................................................ 10
8.3 DIRT HOLDING CAPACITY AND EFFICIENCY........................................................................................................ 12

8.3.1 Dirt holding capacity and efficiency summary .............................................................................. 12
8.3.2 Discussion ...................................................................................................................................... 15
8.4 ELEMENT PERFORMANCE SUMMARY .............................................................................................................. 15
9 TEST CONCLUSION.................................................................................................................................. 15
10 PFG DEVELOPMENT ............................................................................................................................ 15

Page 4 of 15
Company Confidential.
© Copyright 2017. Porvair Filtration Group Ltd.

MTR5061
Issue 2

1 SCOPE

This report documents the test results for flow differential pressure, dry unit mass and dirt
holding capacity for both an incumbent and Porvair Filtration Group (PFG) proposed filter
element used on the Boeing 737 hydraulic system.

The report and test program has been compiled in response to reported contamination
issues on 737 aircraft that have resulted in system failures, thus the PFG element will be
used to provide improved system performance. PFG’s design utilises sintered metal fibre as
an alternative technology to the incumbent cellulose/woven mesh filter media.

Note: This report will need to be replicated prior to any PMA application with an approved
PFG part number. PFG’s SK part number denotes a development unit only.

2 SPECIFICATION

Filtration rating: 15µm Absolute (Beta 200 to ISO16889)
Temperature range: -65˚F to 275˚F
System fluid: Phosphate ester BMS3-11
Rated temperature: 100˚F
Rated flow: 43 U.S.G.P.M
Minimum element collapse pressure: 500 psid
Dirt holding capacity: 85g to 90psid

3 APPLICABLE DOCUMENTS

1. MA0902411 – PFG assembly drawing (Not released)
2. ISO16889 – Multipass evaluation method for filter elements
3. T5715 – PFG test memorandum
4. T5714 – PFG test memorandum
5. Incumbent filter element part number : 7588561
6. PFG Part number: SK0892

4 FILTER ELEMENT DESIGN

The following section details the design of both incumbent and PFG filter elements.

4.1 PFG Filter Element

PFG’s filter element consists of a multilayer stainless steel filter pack, housed between two
aluminium end caps, supported by an internal perforated support structure.

The filter pack is constructed from a sintered metal fibre filter media, which has a consistent
and graded pore structure supported by a square weave mesh downstream. The filter pack
is pleated to maximise its effective area, thus reducing face velocity and enhancing
contamination capacity.

The internal support structure provides structural integrity during contamination loading
conditions, up to the minimum specified differential collapse pressure of 500psid. The
support structure also provides support during any axial load & vibration conditions.

The open end cap has an AS4716 designed O ring groove to suit a -120 o ring seal.

Page 5 of 15
Company Confidential.

© Copyright 2017. Porvair Filtration Group Ltd.

MTR5061
Issue 2

Open end cap Figure 1 – PFG test element
Note for test purposes, the
Pleated filter pack spacer end fitting on the
Perforated support closed end cap was omitted.
structure

Closed and cap

4.2 Incumbent Filter Element - 7588561

The incumbent filter element is constructed similarly to that of the PFG design, although the filter pack
is constructed from a cellulose filter media. The filter support structure has a fine mesh wrap from
which the filtration efficiency is achieved with the cellulose media capturing the larger particulate.

5 TEST PLAN

The following table identifies the comparative tests performed on both PFG and the incumbent filter
elements. This addresses the key specification requirements as detailed in paragraph 2.

Test Incumbent Filter element PFG Filter element

Dry Mass X X

Clean Flow differential X X
pressure X X

Dirt holding capacity

Table 1 – PFG element evaluation test plan

6 TEST CONDITIONS

6.1 Standard Test Conditions
All test results, from tests carried out during testing, must be recorded on relevant test
sheets and attached to the qualification test results. The tests will be completed in a practical
sequence based upon availability to complete all testing in an expeditious manner.

Page 6 of 15
Company Confidential.

© Copyright 2017. Porvair Filtration Group Ltd.

MTR5061
Issue 2

6.2 General Test Conditions
6.2.1
6.2.2 Ambient Conditions
6.2.3 Unless otherwise specified in the detail test procedure, each test shall be conducted at a
6.2.4
room temperature of 25±5°C, a relative humidity of 20 to 80 percent and atmospheric
6.2.5 pressure dictated by normal local conditions.

6.3 Test Medium
6.3.1 Unless otherwise specified in the detail procedure, tests shall be conducted using MIL-PRF-
5606.

Test Fluid Temperature
Unless otherwise specified in the detail procedure, all tests shall be conducted with the

hydraulic test fluid maintained at a temperature of 38±5°C (100 ±20°F). The actual
temperature shall be recorded throughout the test program for inclusion in the final test
report.

Tolerance of Test Conditions
Unless specifically noted otherwise in the detail test procedure, tolerance on test conditions
and instrumentation shall not be permitted to exceed the following parameters at any time
during the test program.

i. Time ±2 %

ii. Temperature ±2°C

iii. Gauge Pressure ±1 % of nominal value

iv. Flow ±3%

Accuracy of Test Equipment
Unless specifically noted otherwise in the detail test procedure, tolerance on test
instrumentation shall not be permitted to exceed the following parameters at any time during
the test program.

i. Temperature -55°C to 120°C ± 1.5°C
ii. Pressure
> 120°C ± 0.004(t)
± 1% of FSD for Ø6” Dial Gauges
± 0.25% of full range for transducers

Data Requirements

Laboratory Data
Laboratory test data shall be recorded on data sheets that shall include, as a minimum, the
general information noted as follows:

i. Test title and/or purpose.
ii. Test Procedure Reference
iii. Fluid type and temperature.
iv. Test Date.
v. Responsible development or test engineers name.
vi. Test unit part, issue and serial number.
vii. Laboratory test unit or station identification.

6.3.2 Specific Data
Specific data to be recorded shall be as specified for each test described within this
document. Test data shall be recorded on data sheets that are appropriately labelled to

Page 7 of 15
Company Confidential.

© Copyright 2017. Porvair Filtration Group Ltd.

MTR5061
Issue 2

indicate the nature of the data, and the units of measurement. The data sheets shall be clear
and legible to permit direct inclusion in the Qualification Test Report, along with photographs
taken during the test program.

6.3.3 Test Log
A chronological test log shall be maintained throughout the Qualification test program. The
following minimum information shall be included in the test log.

i. Build-up information sufficient to establish exact configuration of the test unit.
ii. Weight of the test unit.
iii. Day-by-day account of testing, including start and completion dates and time.
iv. Significant events noted during testing, such as out-of-tolerance operation of the unit.
v. Any deviation from the test procedures, and reason(s) for the deviation.
vi. Failures of test fixtures or test hardware, which may have impact on later operation of

the unit, e.g. replacement of gauge.
vii. An account of all failures of the test unit during testing including the date,

circumstances of the failure, items affected, failure analysis, corrective action, repair
time, and extent of re-testing required.
viii. Any additional information, which may explain or amplify the verification test results.

6.4 Inspection and Test Equipment
All quantitative measurements shall be made with certified accurate instruments in current
calibration, and all instruments shall have a valid calibration tag attached.

6.4.1 Inspection Equipment
Standard bench and/or gauge equipment is adequate to perform mechanical inspection.

6.4.2 Test Equipment
Items of test equipment shall be selected from the PFG inventory as applicable, in the
appropriate range of measurement.

6.4.3 Calibration of Instrumentation
All instruments and apparatus used for the performance of tests described in this procedure
shall be calibrated at intervals sufficient to assure continued accuracy and repeatability of
recorded measurements. The equipment calibration system is maintained in accordance with
PFG Quality Procedure QP011, which meets the requirements of MIL-STD-45662.

7 TEST PROCEDURE

The following section of this report details the procedure for each mentioned test in table 1.

7.1 Dry mass

Using scales IT948 record dry mass of identified filter elements.

7.2 Clean differential pressure

7.2.1 Test Procedure

Assemble test block, filter element and seal using test seal NAS1611-120.

Connect high and low pressure ports to the MIL-PRF-5606 rig (PM1046) and bleed any entrapped air
from the system.

Stabilise the fluid temperature to 38°C (100°F). Flow test fluid at intervals of 5.0USGPM from 0-
50USGPM and record the clean differential pressure of the Filter Element Assembly.

The results of this test will be factored back to Skydrol LD4 for the density and viscosity difference,
using the following calculated factor:

Page 8 of 15
Company Confidential.

© Copyright 2017. Porvair Filtration Group Ltd.

MTR5061
Issue 2

Test Fluid H2O Reference Specific Density Kinematic Dynamic
viscosity (cst) Viscosity
MIL-PRF-5606 Density @ 60°F gravity (Kg/m^3)
Skydrol LD4 (Kg/m^3) 17 (Pa.s)
15
999.2 0.83 829.336 0.0141
0.0148
999.2 0.99 989.208

Table 2 – Fluid property table

‫ݏ‬. ݃(‫ܦܮ‬4) ‫ܦܮ(ݒ‬4) 0.99 15
‫ݏ = ݎ݋ݐܿܽܨ‬. ݃(‫ܦܮ‬4) ‫(ݒ ݔ‬5606) = 0.83 ‫ ݔ‬17 = 1.0524

7.3 Dirt holding capacity & efficiency

This test will be used to demonstrate compliance with both the efficiency and dirt holding capacity
requirements defined in paragraph two. This test will be carried out in accordance with ISO16889.

7.4 Equipment Preparation
This test shall be carried out using MIL-PRF-5606 as the working fluid.

Connect the filter assembly to test rig PM1044. Fit particle counters immediately upstream
and downstream of the filter assembly.

Use a data logging system to continually record the differential pressure and oil temperature
throughout the test.

7.5 Test Procedure

With the flow rate at 100litres/min inject 10mg/l of ISO 12103 medium test dust with the
particle distribution shown in table 3.

Particle Size Count
Range (µm) (Volume Fraction)

1 1 to 2

2 4.0 to 5.5

3 7.5 to 9.5

4 10.5 to 13.0

5 15 to 19

7 28 to 33

10 40 to 45

20 65 to 69

40 84 to 88

80 99 to 100

120 100

Table 3 – ISO A3 medium test dust particle
range

7.6 Test requirement

The filter element shall retain 85 grams of contaminant before reaching a terminal differential pressure
of 90psid.

Page 9 of 15
Company Confidential.

© Copyright 2017. Porvair Filtration Group Ltd.

MTR5061
Issue 2

8 TEST RESULTS

The following section provides the test results for the tests mentioned in table 1.

8.1 Dry Mass

See below table 4 for measured mass values for both a PFG and incumbent filter element.

Filter Element Mass (grams)

Incumbent 7588561 590

PFG (SK0892) 1260

PFG MA0902411 (Calculated) 1277

Table 4 – PFG mass analysis

8.2 Clean flow differential pressure

This test was performed to demonstrate a comparison between both filter elements when operating at
clean rated conditions.

8.2.1 Clean pressure loss summary

Filter Element Pressure Loss – MIL-PRF- Pressure Loss – BMS3-11
5606 (Factored)
Incumbent 7588561
PFG (SK0892) 8.70psid 9.16psid

1.31psid 1.37psid

Table 5 – Pressure loss test summary

Refer to figure 2 for graphical linear representation of the pressure loss results.

Page 10 of 15
Company Confidential.

© Copyright 2017. Porvair Filtration Group Ltd.

SK0892

Incumbent Filter T5704 - SK0892 and MFR05228 i
Flow Vs Differential Pressure
SK0892 (Factored Skydrol)
10 15 20
Incumbent Filter (Factored Skydrol) Flow (U
10.00
Figure 2 – Graphical flow
Linear (SK0892)
9.50 Page 1
Company C
Linear (Incumbent Filter) © Copyright 2017. Porv
9.00

8.50

8.00

7.50

Differential Pressure ( Psi) 7.00

6.50

6.00

5.50

5.00

4.50

4.00

3.50

3.00

2.50

2.00

1.50

1.00

0.50

0.00 5
0

MTR5061
Issue 2

incumbent P/N 7588561 Filter
e @ 38DegC in Mil-Prf-5606

25 30 35 40 45
USgpm)

w pressure loss results

11 of 15
Confidential.
vair Filtration Group Ltd.

MTR5061
Issue 2

8.3 Dirt holding capacity and efficiency

This test was conducted to demonstrate the dirt holding capacity performance when subjected to the
flow and contamination ingression specified in paragraph 7.3.

8.3.1 Dirt holding capacity and efficiency summary

The following table 6 identifies the dirt holding capacity and efficiency of both filter elements
considered within this report:

Filter Element Dirt holding Dirt holding Beta ratio at Efficiency at
capacity capacity 15µm 15 µm
Incumbent 7588561 BMS3-11
PFG (SK0892) MIL-PRF-5606 (Factored) 745 99.865%
311 99.678%
36g to 70psid 36g to 73.67psid

112g to 65psid 112g to 67.36psid

Table 6 – Efficiency summary

Page 12 of 15
Company Confidential.

© Copyright 2017. Porvair Filtration Group Ltd.

Figure 3 – Dirt holding

Page 1
Company C
© Copyright 2017. Porv

MTR5061
Issue 2

g capacity test results

13 of 15
Confidential.
vair Filtration Group Ltd.

Figure 4 – Efficie

Page 1
Company C
© Copyright 2017. Porv

MTR5061
Issue 2

ency test results

14 of 15
Confidential.
vair Filtration Group Ltd.

MTR5061
Issue 2

8.3.2 Discussion

The dirt holding capacity results show that PFG filter element SK0892 has a far greater contamination
capacity when tested at the specified conditions. It must be noted that the test was conducted at
100LPM (26.42USGPM) and not the rated flow of 43USGPM due to rig capacity.

The flow rate increase will drive increase both element efficiencies; this will have a detrimental effect
on the contamination capacity of the filter elements.

8.4 Element performance summary

Performance Requirement 7588561 SK0892 Comments

Dry mass 590g 1260g The use of sintered metal fibre
MA0902411 – 1277g significantly increase filter
mass
calculated
High permeability of the
Clean differential pressure 9.16psid 1.37psid sintered metal fibre reduces
112g to 67.36psid
Dirt holding capacity 36g to initial pressure loss, thus
73.67psid maximising filter life. The
incumbent filter 7588561 uses
Efficiency 99.865% @ 99.678% @ 15µm a ‘mesh’ wrap to achieve the
Construction 15µm efficiency, therefore pressure

loss is compromised.

Sintered metal fibre provides a
significant increase in

contamination capacity and
filter life.

The incumbent filter provides a
slight increase in efficiency
performance, although both

achieve greater that beta 200
(Modern absolute definition).

Aluminium

hardware,

bonded using Aluminium hardware,

an epoxy bonded using an epoxy

based resin based resin

Table 6 – Element performance summary

9 TEST CONCLUSION

The testing in this report demonstrates that PFG filter element SK0892 has comparable and better
performance than Incumbent filter element 7588561. There is however a significant increase in unit
mass and a small reduction in filtration efficiency.

10 PFG DEVELOPMENT

To optimise the design PFG could consider further development with the selected metal fibre filter
media with particular regards to weight. The weight reduction will drive a reduction in effective filtration
area and thus reduce contamination capacity. The documented results show PFG can reduce the
effective area significantly and still better the incumbent filter performance.

Page 15 of 15
Company Confidential.

© Copyright 2017. Porvair Filtration Group Ltd.

*OREDO)LOWUDWLRQ

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1. Scope
This engineering data package documents that Global Filtration, Inc. has complied with all theapplicable
requirements, as identified in the certification basis of Test and Computations per 14CFR 21.303(a)(4)
and (5). This package and all attached documents that support our request forapproval are true and no
false or misleading statements have been made (reference 14 CFR § 21.2).

2. PartFunction
Global Filtration’s research of this part number has determines the element is non-flight criticaland an
expendable part. The Hydraulic element separates and collects contaminants from the fluid,keeping the
system clean. If the element was to reach its capacity the effect on the system would beminimal and
unfiltered or dirty fluid might enter the system. But it would still allow the fluid to stillcirculate within the
system.

3. StatementofNon-criticality 1
Global’s research has determined the Hydraulic Filter (P/N 7588561GF) is a non-safety significant,
expendable, non-critical part. When installed correctly, the Hydraulic Filter willperform as
intended.

4. FMEA
The Hydraulic element separates and collects contaminants from the system, keeping the fluid clean.
Ifthe element was to reach its capacity the effect on the system would be minimal and unfiltered
ordirty fluid might enter the system. But it would still allow the fluid to still circulate within the
system.

5. AssessmentofICA
A supplemental ICA is not required. The Hydraulic Filter will be maintained in accordancewith the
Manufacturer’s and Airline’s IPC and maintenance manuals. The Boeing Hydraulic Filteris removed and
disposed of during normal maintenance cycles. However, the extended dirt holding capacity of this
element might warrant a written application for longer use.

No further action required.

6. SafetyAssessment
After performing a qualitative assessment, Global has determined that the HydraulicFilter, as stated in
Assessment of ICA, above, is required to pass several installation, acceptanceand quality inspections.
These inspections ensure the quality and integrity of the installation. TheHydraulic
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