Honeywell International Inc.

2525 West 190th Street

Torrance, California 90504-6002
U.S.A.
CAGE: 70210
Telephone: 800-601-3099 (Toll Free U.S.A./Canada)
Telephone: 602-365-3099 (International Direct)

Website: www.myaerospace.com

SERVICE BULLETIN
AIR CONDITIONING - LEFT HAND (LH) PRIMARY HEAT EXCHANGER UNIT - Rework LH Primary Heat
Exchanger Unit, from PN 2215240-1 Series 2, PN 2215240-1 Series 2 Mod Record 1, and PN 2215240-1
Series 3 to PN 2215240-1 Series 4, or from PN 2215240-1 Series 2 Mod Record 2 to PN 2215240-1 Series
2 Mod Record 2 and 4, or from PN 2215240-2 Series 1, PN 2215240-2 Series 1 Mod Record 1, and
PN 2215240-2 Series 2 to PN 2215240-2 Series 3

Legal Notice

Export Control

This document contains technical data and is subject to U.S. export regulations. These commodities,
technology, or software were exported from the United States in accordance with the export administration
regulations. Diversion contrary to U.S. law is prohibited.
ECCN: 9E991.

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1. License Grant - If you are a party to an applicable product support agreement, a Honeywell Service Center
agreement, or an authorized repair facility agreement, Honeywell hereby grants you a limited, non-exclusive

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 SERVICE BULLETIN
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license to use these Materials to operate, maintain, or repair Honeywell aerospace products only in accordance
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If you are a direct recipient of these Materials from Honeywell’s Aerospace Technical Publication Distribution
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Safety Advisory
WARNING: BEFORE THE MATERIALS CALLED OUT IN THIS PUBLICATION ARE USED, KNOW THE
HANDLING, STORAGE AND DISPOSAL PRECAUTIONS RECOMMENDED BY THE MANUFACTURER OR
SUPPLIER. FAILURE TO OBEY THE MANUFACTURERS’ OR SUPPLIERS’ RECOMMENDATIONS CAN
RESULT IN PERSONAL INJURY OR DISEASE.
This publication describes physical and chemical processes which can make it necessary to use chemicals,
solvents, paints, and other commercially available materials. The user of this publication must get the Material
Safety Data Sheets (OSHA Form 174 or equivalent) from the manufacturers or suppliers of the materials to
be used. The user must know the manufacturer/supplier data and obey the procedures, recommendations,
warnings and cautions set forth for the safe use, handling, storage, and disposal of the materials.
Warranty/Liability Advisory
WARNING: HONEYWELL ASSUMES NO RESPONSIBILITY FOR ANY HONEYWELL EQUIPMENT
WHICH IS NOT MAINTAINED AND/OR REPAIRED IN ACCORDANCE WITH HONEYWELL’S PUBLISHED
INSTRUCTIONS AND/OR HONEYWELL’S FAA/SFAR 36 REPAIR AUTHORIZATION. NEITHER DOES
HONEYWELL ASSUME RESPONSIBILITY FOR SPECIAL TOOLS AND TEST EQUIPMENT FABRICATED
BY COMPANIES OTHER THAN HONEYWELL.
WARNING: INCORRECTLY REPAIRED COMPONENTS CAN AFFECT AIRWORTHINESS OR DECREASE
THE LIFE OF THE COMPONENTS. INCORRECTLY FABRICATED SPECIAL TOOLING OR TEST
EQUIPMENT CAN RESULT IN DAMAGE TO THE PRODUCT COMPONENTS OR GIVE UNSATISFACTORY
RESULTS.

Copyright - Notice
Copyright 2014, 2015 Honeywell International Inc. All rights reserved.

Honeywell is a registered trademark of Honeywell International Inc.

All other marks are owned by their respective companies.
THIS IS THE SB FOSI - DATE: 20121114

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Transmittal Information
ATA Number 2215240-21-2806 (Publication Number D200909000024)
Summary
This revision is a FULL replacement. This revision includes the changes that follow:
• Changed the assembly instructions for the LH primary heat exchanger unit.
• Changed the content and format to agree with Honeywell processes in effect at the time of the release
of this revision.
The information that is identified with revision bars is listed in the Revision History section. Revision bars
are not used before Paragraph 1.A. The editorial changes and information that was moved, removed, or
reformatted are not identified with revision bars.
Refer to Paragraph 1.N. for a list of the acronyms and abbreviations used in this service bulletin.
Revision History
This service bulletin has had one revision(s) as shown in Table 1.
Table 1. Revision History
Revision Number Revision Date
0 22 Dec 2014
1 24 Mar 2015

Highlights
This section issues Revision 1 to Service Bulletin, ATA Number 2215240-21-2806 (Publication Number
D200909000024), and contains these changes:
The list of highlights tells the users about the changes that the revision makes. The list has three columns. The
"Page" column shows the block of data that the revision changes and the page on which the block begins.
The block can be a section, subsection, graphic, table, etc. Revision marks give the location of the change in
the block. The "Description" column tells the user about the change or changes in each block. A paragraph,
table, or figure reference often comes before the description. The "Effectivity" column tells the user about
the part number(s) to which the block of information applies. The default value for this column is "All." "All"
means that the block applies to all parts.

Page Description Effectivity

12 Paragraph 2.C.(2). Added MIL-PRF-81733 sealant to Table 7. Materials All

15 Paragraph 3.C.(1).(d).1. Replaced MIL-A-46146 adhesive with MIL-PRF-81733 All
sealant.
15 Paragraph 3.C.(1).(d).2. Changed instructions from install to locate and replaced All
adhesive with sealant.
15 Paragraph 3.C.(1).(d).3. Changed instructions from install to locate and replaced All
adhesive with sealant.

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Page Description Effectivity

15 Paragraph 3.C.(1).(d).4. Replaced MIL-A-46146 adhesive with MIL-PRF-81733 All

sealant.
15 Paragraph 3.C.(1).(d).5. Replaced adhesive with sealant. All
15 Paragraph 3.C.(1).(d).6. Added instruction for the rivets. All
15 Paragraph 3.C.(1).(d).7. Replaced MIL-A-46146 adhesive with MIL-PRF-81733 All
sealant.
15 Paragraph 3.C.(1).(d).8. Added clarification instructions for installing nutplates, All
while sealant is still wet.
18 Paragraph 3.C.(1).(e).1. Replaced MIL-A-46146 adhesive with MIL-PRF-81733 All
sealant.
18 Paragraph 3.C.(1).(e).2. Changed instructions from install to locate and replaced All
adhesive with sealant.
18 Paragraph 3.C.(1).(e).3. Changed instructions from install to locate and replaced All
adhesive with sealant.
18 Paragraph 3.C.(1).(e).4. Replaced MIL-A-46146 adhesive with MIL-PRF-81733 All
sealant.
18 Paragraph 3.C.(1).(e).5. Replaced adhesive with sealant. All
18 Paragraph 3.C.(1).(e).6. Added instruction for the rivets. All
18 Paragraph 3.C.(1).(e).7. Replaced MIL-A-46146 adhesive with MIL-PRF-81733 All
sealant.
18 Paragraph 3.C.(1).(e).8. Added clarification instructions for installing nutplates, All
while sealant is still wet.
23 Paragraph 3.D.(2).(a). Added reference for installation details and requirements. All
24 Paragraph 3.D.(2).(b). Added reference for installation details and requirements. All
24 Paragraph 3.D.(2).(c). Changed instructions for installing the diffuser assembly. All
24 Paragraph 3.D.(2).(d). Changed instructions for installing the diffuser assembly. All

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Blank Page

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1. Planning Information

A. Effectivity

(1) The LH primary heat exchanger unit installed on the aircraft or stocked as a spare is
affected by this service bulletin. Refer to Table 2.
Table 2. Applicable Components
Honeywell Boeing
PN PN Serial Number Application
2215240-1 Series 2 S210A001-101 All B737-600
B737-700
2215240-1 Series 2 Mod S210A001-101 B737-700C
Record 1 B737-800
2215240-1 Series 2 Mod S210A001-101 B737-900
Record 2 B737-900ER

2215240-1 Series 3 S210A001-101

2215240-2 Series 1 S210A001-500
2215240-2 Series 1 Mod S210A001-500
Record 1
2215240-2 Series 2 S210A001-500

B. Concurrent Requirements

(1) Not applicable.

C. Reason

(1) Problem

(a) Multiple field returns of diffuser assemblies have shown damaged and/or
missing diffuser brackets, door stops, and hinge pins. Damage to the plenum
flange is also observed.

(2) Background

(a) Honeywell has reviewed the field reports. A material change to the Inconel
625 for the existing diffuser side brackets will be sufficient to increase
resistance to the deformation, cracking and shearing that is associated with
the current design. The plenum side mounting brackets are also changed
from aluminum to 15-5PH stainless steel. A change to the door stop shape
will improve the door stop resistance to check valve door impacts. A hinge
pin change to add a lock nut as well as the addition of a C-shaped shim to
prevent the lock nut from disengaging, thus improving the hinge pin retention.
Addition of a metal shim between the plenum and the soft seal will reduce the
chances of adhesion which can damage the plenum.

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(3) Benefits
(a) The new design will prevent damage to the diffuser brackets and door stop.
Hinge pin retention will be improved. Potential damage to the plenum flange
will be reduced.
(4) Action
(a) The diffuser side mounting brackets are changed to a higher strength material
(from aluminum to Inconel 625). The plenum side mounting brackets are
changed to a higher strength material (from aluminum to 15-5PH stainless
steel). The door stop shape is changed from “L” to “S” shaped. The hinge pin
design is changed to incorporate a threaded end with the addition of a washer
and lock nut, as well as the addition of a C-shaped shim to prevent the lock nut
from disengaging. A metal shim is added between the plenum and soft seal.
D. Description
(1) This service bulletin gives instructions to rework the LH primary heat exchanger
unit from PN 2215240-1 Series 2, PN 2215240-1 Series 2 Mod Record 1 and PN
2215240-1 Series 3 to PN 2215240-1 Series 4, or from PN 2215240-1 Series 2 Mod
Record 2 to PN 2215240-1 Series 2 Mod Record 2 and 4, or from PN 2215240-2
Series 1, PN 2215240-2 Series 1 Mod Record 1 and PN 2215240-2 Series 2 to PN
2215240-2 Series 3.
E. Compliance
(1) This service bulletin, recommended by Honeywell, is done at the next shop visit.
F. Approval
(1) The repairs and modifications herein are minor per 14 CFR 21.93/CS 21.93 and
comply with the applicable regulations and are on record with the supplier as FAA
approved, as well as EASA/JAA approved by process via 14 CFR 21.95/CS 21.95.
G. Manpower
(1) No additional man-hours are necessary when this service bulletin is done at overhaul
or repair.
H. Weight and Balance
(1) None.
I. Electrical Load Data
(1) Not applicable.
J. Software Accomplishment Summary
(1) Not applicable.
K. References
(1) Publications.
(a) The Honeywell publication(s) used to do this service bulletin is/are given
in Table 3.

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Table 3. Honeywell Publication(s)

CMM
Outline PN ATA Number Revision
2215240 21-50-70 5

NOTE: Unless specified differently, you can use subsequent revisions.

L. Other Publications Affected

(1) The same as the publication(s) given in Paragraph 1.K.(1).

M. Interchangeability or Intermixability of Parts

(1) Not applicable.

N. Acronyms and Abbreviations

(1) Refer to Table 4 for a list of the acronyms and abbreviations used in this service bulletin.
Table 4. Acronyms and Abbreviations
Term Full Term
ATA Air Transport Association
CAGE commercial and government entity
CM centimeter(s)
CMM component maintenance manual
ECCN Export Control Classification Number
FAA Federal Aviation Administration
GSE ground support equipment
IPL illustrated parts list
JAA Joint Aviation Authorities
LH left hand
mm millimeter(s)
NA not applicable
OSHA Occupational Safety and Health Administration
PN part number
Qty quantity
SAE Society of Automotive Engineers
SFAR Special Federal Aviation Regulation

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2. Material Information

A. Material - Price and Availability

(1) Purchase the new part(s) for this service bulletin from Honeywell at the prices given in
Paragraph 2.C. of this service bulletin.

(2) Purchase the new part(s) from:

Honeywell
Aerospace Contact Team
Telephone: 800-601-3099 (Toll Free U.S.A./Canada)
Telephone: 602-365-3099 (International Direct)

B. Industry Support Information

(1) Not applicable.

C. Material Necessary for Each Component

(1) Refer to Table 5 for material to be purchased and to Table 6 for the
instructions/disposition codes.

NOTE: The illustrated parts catalogs and spare parts bulletins dated later than
the original issue date of this service bulletin can introduce different parts.
Refer to these documents before you order parts.

NOTE: The parts usually discarded when you access the area, referred to in this
service bulletin, are not included.

Table 5. Operator-Purchased Material

Keyword/ Unit Instructions/
2 3
New PN Nomenclature Old PN Qty Price Disposition Codes
1
MS20426AD3-3 Rivet MS20426AD3-2 8 - B, T
1
627-520-7402 Rivet MS20470AD4-2 16 - B, T
or
MS20600AD4W2
or
MS20470AD4-4
1
627-520-7403 Rivet MS20470AD4-2 7 - B, T
or
MS20600AD4W3
or
MS20470AD4-5
1
627-520-7404 Rivet MS20600AD4W4 6 - B, T
or
MS20600AD4W4
or
MS20470AD4-6

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Table 5. Operator-Purchased Material (Cont)

Keyword/ Unit Instructions/
2 3
New PN Nomenclature Old PN Qty Price Disposition Codes
1 4
627-520-7403 Rivet MS20470AD4W3 6 - B, T
or
MS20600AD4W3
or
MS20470AD4-6
MS21043-06 Self locking nut NA 2 - Q, T
MS21060L3 Nutplate MS21060L3 4 - B, T
4 5
NAS1149C0332R Washer NAS1149C0332R 6 - E, T
NAS6603-3 Bolt NAS6603-3 6 - E, T
4 5
NAS620C6 Washer NA 2 - Q, T
2215628-4 Primary diffuser 2215628-2 1 NA C
4
assembly or
2215628-3
4 5
2215696-1 Gasket 2215696-1 1 $186.00 F
5848538-3 Primary diffuser 5848538-1 1 NA C
5
assembly or
5848538-2
2215714-3 Shim 2215714-1 1 $1012.00 Q
5850135-1 Door stop 2215673-1 1 $2738.00 F
5850543-1 Hinge pin MS20253P4-1044L 1 $78.00 F
or
MS20253P4-1000L
or
MS20253P4-1050L
4 5
5850544-1 Bracket assembly 2215677-1 2 $951.00 F
4 5
5850545-1 Metal shim NA 1 $306.00 Q
4
6009328-1 Identification plate 2356840-1 1 $29.00 F
or
6009072-1
5
6009529-1 Identification plate 2356909-1 1 $29.00 F
or
6009074-1
67041092-1 Diffuser bracket 2215674-1 2 $506.00 F
4
67041090-1 Diffuser bracket 2215825-1 2 $506.00 F
2215659-1 Diffuser hinge 2215659-1 1 $14974.00 E

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Table 5. Operator-Purchased Material (Cont)

Keyword/ Unit Instructions/
2 3
New PN Nomenclature Old PN Qty Price Disposition Codes
5
67041093-1 Diffuser bracket 5848543-1 2 $506.00 F
5848999-2 Check valve door 5848999-1 1 $3916.00 F
assembly or
2215658-1 with
2215639-1
NOTES:
1. Rivet grip lengths have been sized for nominal material thickness and will be verified prior to installation. One
size longer or shorter rivet of the exact same part number series, material and finish may be used due to
stack tolerance dimensions.
2. These prices are valid as of the initial release of this service bulletin. Refer to the Honeywell Spare Parts
Catalog for the current price or call for a price quote.
3. Prices are in United States Dollars.
4. For LH primary heat exchanger assembly, PN 2215241-6 (outline PN 2215240-1).
5. For LH primary heat exchanger assembly, PN 2215241-7 (outline PN 2215240-2).

Table 6. Instructions/Disposition Codes

Code Description
Disposition Code B Replaced part.
Disposition Code C Rework the part as shown in this service bulletin.
Disposition Code E Install the removed part if serviceable, if not serviceable replace.
Disposition Code F Discard the removed part and replace with a new part.
Disposition Code Q Added part.
Disposition Code T Commercially available.

(2) Material(s) supplied by operator is/are given in Table 7.

NOTE: The materials given in Table 7 are the consumable products used in the
modification of the unit.
Table 7. Materials
Number Description Source

NOTE: You can use equivalent alternative materials unless specified differently. The user must find
equivalent alternatives.
Desoclean 45 solvent PRC-DeSoto International Inc,
5454 San Fernando Rd., Glendale,
CA 91203 (V83574)

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Table 7. Materials (Cont)

Number Description Source
Eccostrip 57 adhesive/sealant remover National Starch and Chemical Co.,
Emerson and Cuming Specialty,
869 Washington St., Canton, MA
02021-2513 (V04552)
MIL-A-46146, Group II, Type 1 adhesive Commercially available
Gray
MIL-C-5541, Class 1A conversion coat Commercially available
MIL-PRF-81733, Type II-2 or Type sealant Commercially available
II-1/2, Class 1, Grade B
MIL-PRF-83483 anti-seize lubricant Commercially available

D. Material Necessary for Each Spare

(1) Not applicable.
E. Reidentified Parts
(1) Refer to Table 8 for reidentified parts.
Table 8. Reidentified Parts
New PN Keyword/Nomenclature Old PN
2215240-1 Series 4 LH primary heat exchanger unit 2215240-1 Series 2
2215240-1 Series 4 LH primary heat exchanger unit 2215240-1 Series 2 Mod Record 1
2215240-1 Series 2 Mod Record LH primary heat exchanger unit 2215240-1 Series 2 Mod Record 2
2 and 4
2215240-1 Series 4 LH primary heat exchanger unit 2215240-1 Series 3
2215240-2 Series 3 LH primary heat exchanger unit 2215240-2 Series 1
2215240-2 Series 3 LH primary heat exchanger unit 2215240-2 Series 1 Mod Record 1
2215240-2 Series 3 LH primary heat exchanger unit 2215240-2 Series 2
2215628-4 Primary diffuser assembly 2215628-2 or -3
5848538-3 Primary diffuser assembly 5848538-1 or -2

F. Tooling
(1) Not applicable.

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3. Accomplishment Instructions

A. General Information
WARNING: BEFORE YOU USE A MATERIAL, REFER TO THE MANUFACTURERS’
MATERIAL SAFETY DATA SHEETS. SOME MATERIALS CAN BE
DANGEROUS.
CAUTION: DO NOT USE MATERIALS THAT ARE NOT EQUIVALENT TO
HONEYWELL-SPECIFIED MATERIALS. MATERIALS THAT ARE NOT
EQUIVALENT CAN CAUSE DAMAGE TO THE EQUIPMENT AND CAN MAKE
THE WARRANTY NOT APPLICABLE.
CAUTION: DO NOT DROP OR HIT THE UNIT DURING THESE PROCEDURES.
THIS UNIT CONTAINS AN ASSEMBLY THAT CAN BE DAMAGED FROM
INCORRECT USE.
CAUTION: DO THESE PROCEDURES IN A CLEAN ENVIRONMENT TO PREVENT
DAMAGE TO MECHANICAL COMPONENTS.
(1) Obey the precautions.
(2) The manual(s) given in Paragraph 1.K. of this service bulletin contain the disassembly,
cleaning, check, assembly, and test instructions. This/These manual(s) must be
used to complete this service bulletin.
(3) Clean the parts after removal in accordance with the referenced CMM.
(4) Replace all packings and gaskets removed at disassembly with new packings
before assembly.
B. Disassembly of the LH Primary Heat Exchanger Unit
(1) Refer to the DISASSEMBLY section of CMM 21-50-70 and CMM IPL Figure 1 to
do this service bulletin.
(2) Disassemble the LH primary heat exchanger unit as necessary to gain access to
the diffuser assembly.
(3) Remove the screws (15, IPL Figure 1), bolts (20), and washers (25) to remove the
diffuser assembly (30A, 30B, 30C, 30D, 30E).
(4) Remove the bolts (50) and washers (55) to remove the bracket assemblies (45) from
the plenum assembly.
(a) If the bolts and washers are serviceable, set them aside for installation.
Otherwise, replace with the same parts.
WARNING: USE CORRECT PROTECTION IN AN AREA WITH A GOOD FLOW OF AIR.
SOLVENT CAN CAUSE SKIN, EYE, AND RESPIRATORY DAMAGE. DO
NOT USE NEAR AN OPEN FLAME.
(5) Use a clean cloth soaked, but not dripping, with Desoclean 45, solvent or Eccostrip 57,
adhesive/sealant remover to remove the remaining adhesive.
(a) Wipe the area with a clean dry cloth before the solvent or adhesive sealant
remover dries.

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C. Modification of the Diffuser Assembly, PN 2215628-2 or -3 and PN 5848538-1 or -2

(1) Remove and replace the diffuser brackets as follows:
(a) Remove and discard the rivets (31A, 31C, 31E, IPL Figure 1) that hold the
diffuser brackets (31, 31B, 31D) to the diffuser assembly (30A, 30B, 30C,
30D, 30E).
(b) Remove the diffuser brackets (31, 31B, 31D) and discard.
WARNING: USE CORRECT PROTECTION IN AN AREA WITH A GOOD FLOW
OF AIR. SOLVENT CAN CAUSE SKIN, EYE, AND RESPIRATORY
DAMAGE. DO NOT USE NEAR AN OPEN FLAME.
(c) Use a clean cloth soaked, but not dripping, with Desoclean 45, solvent or
Eccostrip 57, adhesive/sealant remover to remove the remaining adhesive.
1 Wipe the area with a clean dry cloth before the solvent or adhesive
sealant remover dries.
(d) Modify the diffuser assembly (30A, 30D), PN 2215628-2 or -3, as follows:
1 Apply sealant, MIL-PRF-81733, Type II-2 or Type II-1/2, Class
1, Grade B to the interfacing surfaces of the two brackets, PN
67041090-1, the two brackets, PN 67041092-1, and the diffuser
assembly.
2 Locate the two brackets, PN 67041090-1, where the two brackets
(31), PN 2215825-1, were removed while the sealant is still wet.
3 Locate the two brackets, PN 67041092-1, where the two brackets
(31D), PN 2215674-1, were removed while the sealant is still wet.
4 Apply sealant, MIL-PRF-81733, Type II-2 or Type II-1/2, Class 1,
Grade B to the rivets PN MS20470AD4-4 or PN MS20600AD4W2,
or PN 627-520-7402.
5 Install the rivets, PN MS20470AD4-4 or PN MS20600AD4W2, or
PN 627-520-7402 that hold brackets, PN 67041090-1 and PN
67041092-1, to the diffuser assembly while the sealant is still wet in
accordance with MIL-R-47195 or MIL-R-47196.
6 New diffuser brackets, PN 67041090-1 and PN 67041092-1, are
supplied without mounting holes. Drill mount holes as required per
Figure 1 and rivet holes per MIL-R-47196.
7 Apply sealant, MIL-PRF-81733, Type II-2 or Type II-1/2, Class
1, Grade B to the interfacing surfaces of the four nutplates, PN
MS21060L3, and the four replacement brackets, and rivets, PN
MS20426AD3-3.
8 Attach the nutplates, PN MS21060L3, to the four brackets using
rivets, PN MS20426AD3-3, while sealant is wet, in accordance with
MIL-R-47196. To maximize the edge distance between the rivet
and bracket, the nutplate may be rotated ± 15 degrees from the
position shown.

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Figure 1. (Sheet 1 of 2) Diffuser Bracket Installation for Diffuser Assembly, PN 2215628-4

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Figure 1. (Sheet 2 of 2) Diffuser Bracket Installation for Diffuser Assembly, PN 2215628-4

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Dimensional Limits for Figure 1 (Sheet 2 of 2)

Limits Limits
Reference Inches (mm) Reference Inches (mm)
DIM. A 5.1875 DIM. D 5.1875
(13.176 CM) (13.176 CM)
DIA B 0.247 TO 0.258 ANG E 98 DEGREES
(6.27 TO 6.55)

(e) Modify the diffuser assembly (30B, 30C, 30E), PN 5848538-1 or -2, as follows:
1 Apply sealant, MIL-PRF-81733, Type II-2 or Type II-1/2, Class
1, Grade B to the interfacing surfaces of the two brackets PN
67041093-1, the two brackets PN 67041092-1, and the diffuser
assembly.
2 Locate the two brackets, PN 67041093-1, where the two brackets
(31B), PN 5848543-1, were removed while the sealant is still wet.
3 Locate the two brackets, PN 67041092-1, where the two brackets
(31D), PN 2215674-1, were removed while the sealant is still wet.
4 Apply sealant, MIL-PRF-81733, Type II-2 or Type II-1/2, Class 1,
Grade B to the rivets PN MS20470AD4-4 or PN MS20600AD4W2,
or PN 627-520-7402.
5 Install the rivets PN MS20470AD4-4 or PN MS20600AD4W2, or PN
627-520-7402 that hold brackets PN 67041093-1 and PN 67041092-1
to the diffuser assembly while the sealant is still wet in accordance
with MIL-R-47195 or MIL-R-47196.
6 New diffuser brackets, PN 67041092-1 and PN 67041093-1, are
supplied without mounting holes. Drill mount holes as required per
Figure 2 and rivet holes per MIL-R-47196.
7 Apply sealant, MIL-PRF-81733, Type II-2 or Type II-1/2, Class
1, Grade B to the interfacing surfaces of the four nutplates, PN
MS21060L3, and the four replacement brackets, and rivets, PN
MS20426AD3-3.
8 Attach the nutplates, PN MS21060L3, to the four brackets using
rivets, PN MS20426AD3-3, while the sealant is still wet, in accordance
with MIL-R-47196. To maximize the edge distance between the rivet
and bracket, the nutplate maybe rotated ± 15 degrees from the
position shown.

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Figure 2. (Sheet 1 of 2) Diffuser Bracket Installation for Diffuser Assembly, PN 5848538-3

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Figure 2. (Sheet 2 of 2) Diffuser Bracket Installation for Diffuser Assembly, PN 5848538-3

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Dimensional Limits for Figure 2 (Sheet 2 of 2)

Limits Limits
Reference Inches (mm) Reference Inches (mm)
DIM. A 5.1875 DIM. D 5.1875
(13.176 CM) (13.176 CM)
DIA B 0.247 TO 0.258 ANG E 63 TO 65 DEGREES
(6.27 TO 6.55)

(2) Remove and replace the door stop (31F, IPL Figure 1) as follows:
(a) Remove the seven rivets (31G) to remove the door stop (31F) from the diffuser
assembly (30A, 30B, 30C, 30D, 30E).
WARNING: USE CORRECT PROTECTION IN AN AREA WITH A GOOD FLOW
OF AIR. SOLVENT CAN CAUSE SKIN, EYE, AND RESPIRATORY
DAMAGE. DO NOT USE NEAR AN OPEN FLAME.
(b) Use a clean cloth soaked, but not dripping, with Desoclean 45, solvent or
Eccostrip 57, adhesive/sealant remover to remove the remaining adhesive.
1 Wipe the area with a clean dry cloth before the solvent or adhesive
sealant remover dries.
WARNING: USE CORRECT PROTECTION IN A WELL-VENTILATED AREA.
CHEMICAL GOGGLES MUST BE WORN. ADHESIVE CAN CAUSE
SKIN, EYE, AND LUNG DAMAGE. DO NOT USE NEAR AN
OPEN FLAME.
(c) Apply adhesive, MIL-A-46146, Group II, Type I Gray to the interfacing surfaces
of the new door stop, PN 5850135-1, and the diffuser assembly.
WARNING: USE CORRECT PROTECTION IN A WELL-VENTILATED AREA.
CHEMICAL GOGGLES MUST BE WORN. ADHESIVE CAN CAUSE
SKIN, EYE, AND LUNG DAMAGE. DO NOT USE NEAR AN
OPEN FLAME.
(d) Apply adhesive, MIL-A-46146, Group II, Type I Gray to the rivets, PN
MS20470AD4-5, PN MS20600AD4W3, or PN 627-520-7403.
(e) Refer to Figure 3 for the orientation of the door stop, PN 5850135-1.
(f) While the adhesive is still wet, install the rivets, PN MS20470AD4-5, PN
MS20600AD4W3, or PN 627-520-7403 on the door stop, PN 5850135-1, in
accordance with MIL-R-47195 or MIL-R-47196.

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Figure 3. (Sheet 1 of 1) Installation of the Door Stop

Dimensional Limits for Figure 3 (Sheet 1 of 1)

Limits Limits
Reference Inches (mm) Reference Inches (mm)
DIM. A 0.29 (7.4) DIM. B 0.29 (7.4)

(3) Remove and replace the hinge pin (34, 34A, 34B, IPL Figure 1) and add the new
shim, PN 2215714-3, as follows:
(a) If applicable, remove the two rivets (33) at both ends of the diffuser hinge.
(b) Remove the hinge pin (34, 34A, 34B) along with the check valve door
assembly (32, 32A) from the diffuser hinge (31H).
(c) Remove the six rivets which attach diffuser hinge (31H) to the diffuser
assembly. Discard existing shim which is installed between the diffuser
hinge and the diffuser assembly.
(d) Mark the center of the diffuser hinge (31H) and shim, PN 2215714-3. Lay the
shim, PN 2215714-3 on the underside of the diffuser hinge (31H) and align the
center marks. The free ends shall be flush. Match drill six holes to 0.094 to
0.102 inch diameter in the shim.
(e) Apply conversion coat, MIL-C-5541, Class 1A, to the machined rivet holes.

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(f) Align the diffuser hinge (31H) with a new check valve door assembly, PN
5848999-2, and install a new hinge pin, PN 5850543-1.
(g) Lightly coat new hinge pin threads with MIL-PRF-83483 anti-seize lubricant.
(h) Install two new washers, PN NAS620C6, and two new self-locking nuts, PN
MS21043-06, on each end of the hinge pin until the nut is flush with the
hinge pin shoulder.
CAUTION: TORQUE VALUES ARE IN ADDITION TO THE TORQUE REQUIRED
TO OVERCOME SELF-LOCKING DEVICES.
(i) Torque the self-locking nut to limits of 19 to 21 in-lbs (2.15 to 2.37 Nm).
(j) Apply adhesive, MIL-A-46146, Group II, Type I Gray to interfacing surfaces of
the shim, PN 2215714-3, diffuser hinge (31H), and primary diffuser inner wall
of applicable diffuser assembly (30, 30A, 30B, 30C, 30D, 30E).
(k) Place shim, PN 2215714-3, between the diffuser hinge and the diffuser
assembly so that the formed ends of the new shim extend over the self-locking
nut as a secondary retention mechanism for the hinge pin.
(l) Apply adhesive, MIL-A-46146, Group II, Type I Gray to the 6 rivets which will
attach the diffuser hinge (31H) and new shim to the diffuser shell.
NOTE: There must be a minimum clearance of 0.005 inch on one side between
shim, PN 2215714-3, and hinge pin, PN 5850543-1.
(m) For diffuser assembly PN 2215628, use rivets, PN MS20600AD4W3,
PN MS20470AD4-6, or PN 627-520-7403. For diffuser assembly PN
5848538, use rivets rivets, PN MS20600AD4W4, PN MS20470AD4-6, or PN
627-520-7404. Install the 6 rivets, while the adhesive is still wet in accordance
with MIL-R-47195.
(n) Inspect to confirm minimum clearance of 0.005 inch on one side between
shim, PN 2215714-3, and hinge pin, PN 5850543-1.
(4) Re-identify the diffuser assembly as follows:
(a) Re-identify diffuser assembly, PN 2215628-2 or PN 2215628-3 as PN
2215628-4, in accordance with SAE AS478 Method 30.
(b) Re-identify diffuser assembly, PN 5848538-1 or PN 5848538-2 as PN
5848538-3, in accordance with SAE AS478 Method 30.
D. Assemble the LH Primary Heat Exchanger Unit
(1) Refer to the ASSEMBLY section of CMM 21-50-70 and CMM IPL Figure 1 to do this
service bulletin.
(2) Assemble the LH primary heat exchanger assembly, PN 2215241-1 or -2, except do
as follows:
(a) Install the new metal shim, PN 5850545-1, between the gasket (245) and the
plenum assembly (135) as shown in Figure 4. Refer to CMM 21-50-70 for
installation details and requirements.

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(b) Install the two new bracket assemblies, PN 5850544-1, in place of bracket
assemblies (45, IPL Figure 1). Refer to CMM 21-50-70 for installation details
and requirements.

(c) If LH primary heat exchanger unit, PN 2215240-1 Series 2 or Series 3,

is being modified, install the diffuser assembly, PN 2215628-4, in place of
diffuser assembly (30A, 30D). Refer to CMM 21-50-70 for diffuser installation
details and requirements.

(d) If LH primary heat exchanger unit, PN 2215240-2 Series 1 or Series 2 is being

modified, install the diffuser assembly, PN 5848538-3, in place of diffuser
assembly (30B, 30C, 30E). Refer to CMM 21-50-70 for diffuser installation
details and requirements.

Figure 4. (Sheet 1 of 1) Metal Shim Installation

Key for Figure 4 (Sheet 1 of 1)

135 PLENUM ASSEMBLY 246 METAL SHIM (PN 5850545-1)

(ADDED PART)
245 GASKET

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(3) Upon completion of the rework of PN 2215240-1 Series 2 Mod Record 2, re-identify as
PN 2215240-1 Series 2 Mod Record 2 and 4 as follows:
(a) Re-identify the heat exchanger unit by stamping or adding the number 4 in to
the Mod record field of the existing identification plate (10A, IPL Figure 1).
(4) Upon completion of the rework of PN 2215240-1 Series 2, PN 2215240-1 Series 2 Mod
Record 1, or PN 2215240-1 Series 3, re-identify as PN 2215240-1 Series 4 as follows:
(a) Remove the identification plate (10A, 10C, IPL Figure 1). Refer to the
instructions in the REPAIR section of CMM 21-50-70.
(b) Transcribe all applicable data as required to the new identification plate,
PN 6009328-1.
(c) Install the new identification plate in place of the existing identification plate
(10A, 10C). Refer to the instructions in the REPAIR section of the CMM
21-50-70.
(5) Upon completion of the rework of PN 2215240-2 Series 1, PN 2215240-2 Series 1 Mod
Record 1, or PN 2215240-2 Series 2, re-identify as PN 2215240-2 Series 3 as follows:
(a) Remove the identification plate (10B, 10D, IPL Figure 1). Refer to the
instructions in the REPAIR section of the CMM 21-50-70.
(b) Transcribe all applicable data as required to the new identification plate,
PN 6009529-1.
(c) Install the new identification plate in place of the existing identification plate
(10B, 10D). Refer to the instructions in the REPAIR section of the CMM
21-50-70.

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