Commercial 

Airplanes 737

Service Bulletin

ALERT

Number: 737-54A1044

Original Issue: December 10, 2007

Revision 2: January 20, 2010

ATA System: 5410

SUBJECT: NACELLES/PYLONS - Nacelle Strut - Midspar Fuse Pin - Inspection, Repair and

Replacement

Export of this technology is controlled under the United States Export Administration Regulations (EAR) (15

CFR 730-774). An export license may be required before it is used for development, production or use by foreign

persons from specific countries. The controller of this data has the individual responsibility to abide by all export

laws.

ECCN: 9E991

BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET

Copyright © 2007 The Boeing Company

Unpublished Work - All Rights Reserved

Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable

subject matter. Boeing also claims copyright in this document as a compilation and/or collective work.

This document includes proprietary information owned by The Boeing Company and/or one or more third parties.

Treatment of the document and the information it contains is governed by contract with Boeing. For more

information, contact The Boeing Company, P.O. Box 3707, Seattle, Washington 98124.

Boeing, the Boeing signature, the Boeing symbol, 707, 717, 727, 737, 747, 757, 767, 777, 787, Dreamliner,

BBJ, DC-8, DC-9, DC-10, KC-10, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8A, Poseidon and the

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connection with this document unless provided in writing by Boeing.

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6.0
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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT

BLANK PAGE
Table of Contents

Revision Transmittal Sheet ............................................ 5

Summary ...................................................... 7

1. PLANNING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

A. Effectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

1. Airplanes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

B. Concurrent Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

C. Reason . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

D. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

E. Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

F. Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

G. Manpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

H. Weight and Balance Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

I. Electrical Load Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

J. References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

1. Existing Data: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

2. Data supplied with this Service Bulletin: . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

3. Installation Drawings Used in the Preparation of this Service Bulletin: . . . . . . . . . . . 29

K. Publications Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

L. Interchangeability and Intermixability of Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

2. MATERIAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

A. Material - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

B. Industry Support Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

C. Parts Necessary For Each Airplane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

1. Kits/Parts: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

2. Parts and Materials Supplied by the Operator: . . . . . . . . . . . . . . . . . . . . . . . . 31

3. Parts Modified and Reidentified: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

4. Parts Removed and Not Replaced: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

D. Parts Necessary to Change Spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

E. Special Tooling - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

F. Special Tooling Necessary to do this Service Bulletin . . . . . . . . . . . . . . . . . . . . . . . 32

3. ACCOMPLISHMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

A. GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

B. WORK INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

FIGURE 1: LEFT SIDE ENGINE STRUT - INBOARD AND OUTBOARD - MIDSPAR FUSE PIN -

INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

FIGURE 2: RIGHT SIDE ENGINE STRUT - INBOARD AND OUTBOARD - MIDSPAR FUSE PIN -

INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

FIGURE 3: MIDSPAR FUSE PIN - REPAIR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

FIGURE 4: LEFT SIDE ENGINE STRUT - INBOARD - MIDSPAR FUSE PIN - INSTALLATION OF NEW

MATERIAL FUSE PIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

FIGURE 5: LEFT SIDE ENGINE STRUT - OUTBOARD - MIDSPAR FUSE PIN - INSTALLATION OF NEW

MATERIAL FUSE PIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

FIGURE 6: RIGHT SIDE ENGINE STRUT - INBOARD - MIDSPAR FUSE PIN - INSTALLATION OF NEW

MATERIAL FUSE PIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
FIGURE 7: RIGHT SIDE ENGINE STRUT - OUTBOARD - MIDSPAR FUSE PIN - INSTALLATION OF NEW

MATERIAL FUSE PIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
Commercial 

Airplanes 737

Service Bulletin

ALERT

Revision Transmittal Sheet Number: 737-54A1044

Original Issue: December 10, 2007

Revision 2: January 20, 2010

ATA System: 5410

SUBJECT: NACELLES/PYLONS - Nacelle Strut - Midspar Fuse Pin - Inspection, Repair and

Replacement

This revision includes all pages of the service bulletin.

COMPLIANCE INFORMATION RELATED TO THIS REVISION

Federal Aviation Administration (FAA) Airworthiness Directive AD 2008-21-03, is related to this service bulletin.

No more work is necessary on airplanes changed as shown in Revision 1 of this service bulletin.

REASON FOR REVISION

This revision is sent to change the compliance table number referenced in the second paragraph in Section F.

Approval, from Table 7 to Table 1.

These sections were changed:

1. Paragraph 1.E., Compliance: added that AD 2008-21-03 is related to this service bulletin.

2. Paragraph 1.F., Approval: revised Table 7 to Table 1 and added "or revision 2", in the AMOC paragraph.

3. Paragraph 1.K., Publications Affected: added the damage tolerance statement that was at the bottom of

the compliance table.

Vertical lines are put on the left edge of each page, except in Paragraph 1.A., Effectivity, to show the location

of important changes.

Pages with no vertical lines have no important changes.

REVISION HISTORY

Original Issue: December 10, 2007

Revision 1: November 26, 2008

Revision 2: January 20, 2010

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT

BLANK PAGE
Commercial 

Airplanes 737

Service Bulletin

ALERT

Summary Number: 737-54A1044

Original Issue: December 10, 2007

Revision 2: January 20, 2010

ATA System: 5410

SUBJECT: NACELLES/PYLONS - Nacelle Strut - Midspar Fuse Pin - Inspection, Repair and

Replacement

THIS BULLETIN IS SENT TO THE OPERATORS OF RECORD OF THE AIRPLANES SHOWN IN PARAGRAPH

1.A., EFFECTIVITY. IF AN AIRPLANE HAS BEEN LEASED OR SOLD, SEND THIS SERVICE BULLETIN TO

THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS SERVICE BULLETIN TO

THE NEW OWNER.

CONCURRENT REQUIREMENTS

None.

BACKGROUND

This service bulletin gives instructions to replace or to inspect the left and right side engine strut, inboard and

outboard midspar fuse pins for any cracking, pitting, corrosion and chrome plate damage. If the work given in

this service bulletin is not accomplished, damage to the midspar fuse pins may go undetected. Undetected

damage could result in the loss of structural integrity of the midspar fuse pins and cause an engine breakaway

from the airplane.

One operator found one 737-300 airplane with all four engine strut midspar fuse pins with corrosion damage.

One of the midspar fuse pins had corrosion common to the chrome run out on the head side. Also, a large

portion of the chrome plate was missing from the corroded area of the shank. The airplane had a total of 28,621

flight cycles.

Boeing Service Related Problem (SRP) 737-SRP-54-0115 is related to this service bulletin.

ACTION (PRR 35005-273RS)

Identify the part numbers of the left and right side engine strut, inboard and outboard midspar fuse pins.

Remove 311A1092-2 midspar fuse pins and install 311A1092-3 midspar fuse pins.

Alternatively, for a limited time, do a detailed inspection of 311A1092-2 midspar fuse pins for any cracking,

pitting, corrosion or chrome plate damage. If damage is found, discard or repair the damaged midspar fuse pins.

Install new or serviceable midspar fuse pins and do the repeat inspection at the specified interval.

EFFECTIVITY

All 737-300, -400, -500 Airplanes. Refer to Paragraph 1.A.1., Airplanes for the list of affected airplanes.

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COMPLIANCE

Refer to Paragraph 1.E., Compliance.

Federal Aviation Administration (FAA) Airworthiness Directive AD 2008-21-03 is related to this service bulletin.

INDUSTRY SUPPORT INFORMATION

Boeing warranty remedies are not available for the inspection given in this service bulletin.

MANPOWER

Refer to Paragraph 1.G., Manpower.

MATERIAL INFORMATION

Operator Supplied Parts/Materials.

Refer to Paragraph 2.A., Material - Price and Availability.

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT

BLANK PAGE
Commercial 

Airplanes 737

Service Bulletin

ALERT

Number: 737-54A1044

Original Issue: December 10, 2007

Revision 2: January 20, 2010

ATA System: 5410

SUBJECT: NACELLES/PYLONS - Nacelle Strut - Midspar Fuse Pin - Inspection, Repair and

Replacement

THIS BULLETIN IS SENT TO THE OPERATORS OF RECORD OF THE AIRPLANES SHOWN IN PARAGRAPH

1.A., EFFECTIVITY. IF AN AIRPLANE HAS BEEN LEASED OR SOLD, SEND THIS SERVICE BULLETIN TO

THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS SERVICE BULLETIN TO

THE NEW OWNER.

1. PLANNING INFORMATION

A. Effectivity

1. Airplanes

This service bulletin is for the airplanes shown below. Refer to PRR 35005-273RS for data about

this change.

Refer to Service Bulletin Index Document D6-19567 Part 3 for Airplane Variable Number, Line

Number, and Serial Number data.

GROUP CONFIGURATION DESCRIPTION

1 - All 737-300, -400, -500 airplanes.

Airplane Models:

737-300, 737-400, 737-500

Variable Number Group

PJ301 - PJ302 1

PJ551 - PJ561 1

PJ601 - PJ615 1

PJ811 1

PJ816 - PJ817 1

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Variable Number Group

PM381 - PM399 1

PM401 - PM417 1

PM541 - PM564 1

PP001 - PP054 1

PP101 - PP169 1

PP181 - PP199 1

PP201 - PP205 1

PP221 1

PP231 - PP243 1

PP281 - PP286 1

PP301 - PP305 1

PP351 - PP353 1

PP376 - PP384 1

PP391 - PP393 1

PP401 - PP440 1

PP471 - PP475 1

PP501 - PP522 1

PP631 - PP634 1

PP651 - PP652 1

PP671 - PP699 1

PP701 - PP733 1

PP771 - PP779 1

PP801 - PP808 1

PP821 - PP827 1

PP831 - PP848 1

PP851 - PP852 1

PP861 - PP877 1

PP891 - PP899 1

PP901 - PP936 1

PP946 - PP948 1

PP951 - PP952 1

PP961 - PP967 1

PP981 - PP991 1

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
Variable Number Group

PP993 1

PQ001 - PQ016 1

PQ026 - PQ041 1

PQ051 - PQ092 1

PQ101 - PQ199 1

PQ201 - PQ202 1

PQ221 - PQ237 1

PQ241 - PQ243 1

PQ251 - PQ267 1

PQ281 - PQ299 1

PQ301 - PQ307 1

PQ331 - PQ332 1

PQ341 - PQ348 1

PQ361 - PQ373 1

PQ391 - PQ395 1

PQ401 - PQ418 1

PQ421 1

PQ431 - PQ438 1

PQ447 - PQ448 1

PQ451 1

PQ454 1

PQ471 - PQ475 1

PQ479 - PQ481 1

PQ486 - PQ487 1

PQ491 - PQ493 1

PQ771 - PQ772 1

PQ791 - PQ793 1

PQ801 - PQ805 1

PQ931 - PQ935 1

PQ951 1

PQ971 - PQ997 1

PR001 - PR017 1

PR021 - PR034 1

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
Variable Number Group

PR041 - PR045 1

PR061 - PR072 1

PR077 - PR082 1

PR091 - PR092 1

PR096 1

PR101 1

PR121 - PR122 1

PR131 - PR132 1

PR141 - PR143 1

PR161 - PR172 1

PR181 1

PS601 - PS631 1

PS636 - PS638 1

PS641 - PS644 1

PS651 - PS657 1

PS666 - PS669 1

PS691 - PS692 1

PS701 - PS706 1

PS751 - PS799 1

PS811 1

PS836 - PS837 1

PS841 - PS846 1

PS851 - PS852 1

PS856 1

PS861 - PS863 1

PS866 - PS868 1

PS871 - PS874 1

PS896 - PS897 1

PS901 - PS941 1

PS956 - PS957 1

PS961 - PS963 1

PS971 - PS978 1

PT001 - PT015 1

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
Variable Number Group

PT021 - PT031 1

PT041 - PT064 1

PT101 - PT105 1

PT121 - PT138 1

PT146 - PT148 1

PT161 - PT170 1

PT181 - PT188 1

PT211 - PT220 1

PT295 1

PT301 - PT309 1

PT331 - PT360 1

PT381 - PT399 1

PT401 - PT438 1

PT501 - PT517 1

PT561 - PT565 1

PT581 - PT586 1

PT611 - PT621 1

PT641 - PT644 1

PT651 - PT656 1

PT671 - PT672 1

PT681 - PT685 1

PT701 - PT703 1

PT716 - PT717 1

PT721 - PT725 1

PT801 - PT834 1

PT851 - PT854 1

PT871 - PT886 1

PT901 - PT930 1

PT971 - PT973 1

PT981 - PT985 1

PT996 1

PU001 - PU025 1

PU301 1

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
Variable Number Group

PU311 - PU313 1

PV001 - PV055 1

PV201 - PV209 1

PV226 - PV229 1

PV231 - PV237 1

PV271 - PV272 1

PV281 - PV287 1

PV296 1

PV301 - PV302 1

PV351 1

PV356 - PV357 1

PW001 - PW054 1

PW061 - PW068 1

PW072 1

PW086 - PW088 1

PW091 - PW094 1

PW101 - PW102 1

PW106 1

PW111 - PW120 1

PW156 - PW157 1

PW161 - PW171 1

PW201 - PW252 1

PW261 - PW268 1

PW271 - PW276 1

PW278 1

PW281 - PW293 1

PW296 1

PW301 - PW327 1

PW401 - PW408 1

PW411 - PW418 1

PW421 - PW424 1

PW431 - PW435 1

PW441 - PW450 1

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
Variable Number Group

PW461 - PW467 1

PW501 - PW504 1

PW511 - PW522 1

PW524 - PW550 1

PW556 - PW557 1

PW561 - PW564 1

PW571 - PW576 1

PW591 - PW596 1

PW611 - PW622 1

PW631 - PW637 1

PW661 - PW662 1

PW681 - PW683 1

PW701 - PW702 1

PW711 - PW717 1

PW741 - PW742 1

PW761 1

PW771 1

PW831 1

PW851 - PW856 1

2. Spares Affected

None.

B. Concurrent Requirements

None.

C. Reason

This service bulletin gives instructions to replace or to inspect the left and right side engine strut, inboard

and outboard midspar fuse pins for any cracking, pitting, corrosion and chrome plate damage. If the

work given in this service bulletin is not accomplished, damage to the midspar fuse pins may go

undetected. Undetected damage could result in the loss of structural integrity of the midspar fuse pins

and cause an engine breakaway from the airplane.

One operator found one 737-300 airplane with all four engine strut midspar fuse pins with corrosion

damage. One of the midspar fuse pins had corrosion common to the chrome run out on the head side.

Also, a large portion of the chrome plate was missing from the corroded area of the shank. The airplane

had a total of 28,621 flight cycles.

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Original Issue: December 10, 2007

Revision 2: January 20, 2010 737-54A1044

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
Boeing Service Related Problem (SRP) 737-SRP-54-0115 is related to this service bulletin.

Revision 1 is sent to add new replacement midspar fuse pins. The 311A1092-3 midspar fuse pins are

manufactured from 15-5PH CRES material and do not require repeat inspections. Refer to Paragraph

1.E., Compliance.

These sections were changed:

1. Paragraph 1.C., Reason: Information is added for the installation of the new material midspar fuse

pins.

2. Paragraph 1.D., Description: Information is added for the installation of the new material midspar

fuse pins.

3. Paragraph 1.E., Compliance: Information is added for the installation of the new material midspar

fuse pins and the termination of repeat inspections.

4. Paragraph 1.J., References: Boeing CMM 54-50-01 and 737-300/400/500 SRM Chapter 51 are

added to Existing Data.

5. Paragraph 2.K., Publications Affected: Boeing CMM 54-50-01 is added.

6. Paragraph 2.C., Parts Necessary for Each Airplane: A new replacement midspar fuse pin is added

to Parts and Materials Supplied by the Operator.

7. Paragraph 3.B., Work Instructions: Instructions are added for the installation of the new material

midspar fuse pins.

8. Figures 4 to 7: These figures are added to install the new material midspar fuse pins.

Revision 2 is sent to change the compliance table number referenced in the second paragraph in

Section F. Approval, from Table 7 to Table 1.

These sections were changed:

1. Paragraph 1.E., Compliance: added that AD 2008-21-03 is related to this service bulletin.

2. Paragraph 1.F., Approval: revised Table 7 to Table 1 and added "or revision 2", in the AMOC

paragraph.

3. Paragraph 1.K., Publications Affected: added the damage tolerance statement that was at the

bottom of the compliance table.

D. Description

Identify the part numbers of the left and right side engine strut, inboard and outboard midspar fuse

pins.

Remove 311A1092-2 midspar fuse pins and install 311A1092-3 midspar fuse pins.

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
Alternatively, for a limited time, do a detailed inspection of 311A1092-2 midspar fuse pins for any

cracking, pitting, corrosion or chrome plate damage. If damage is found, discard or repair the damaged

midspar fuse pins. Install new or serviceable midspar fuse pins and do the repeat inspection at the

specified interval.

Revision 1 - More work is necessary on airplanes changed as shown in the original issue of this service

bulletin. Installation of 311A1092-3 midspar fuse pins is required after the specified time.

Revision 2 - No more work is necessary on airplanes changed in accordance with Revision 1 of this

service bulletin.

The work in this service bulletin is done in the maintenance zone(s) given below.

Affected Maintenance Zones

Model Zone

737-300, 737-400, 737-500 507, 607

E. Compliance

Federal Aviation Administration (FAA) Airworthiness Directive AD 2008-21-03 is related to this service

bulletin.

Table 1: Engine strut midspar fuse pins replacement and detailed inspection

Repeat Interval (Not

to Exceed)

Compliance Time (Whichever Occurs

Later)

Condition Action

Airplanes No action is required. - - - -

with all engine strut

midspar fuse

pins with part

number

311A1092-3.

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
Table 1: Engine strut midspar fuse pins replacement and detailed inspection

Repeat Interval (Not

to Exceed)

Compliance Time (Whichever Occurs

Later)

Condition Action

Within 120 - - -

months after

the date on

Revision 1 of

this service

bulletin.

On the left side engine strut: Install a

new inboard midspar fuse pin in accordance with the Accomplishment Instructions paragraphs 3.B.1.a.(2)(a) See

note (a)

Airplanes

with engine

strut midspar

fuse pins

with part

number

311A1092-2. On the left side engine strut: Install a

new outboard midspar fuse pin in accordance with the Accomplishment Instructions paragraphs 3.B.2.a.(2)(a) See

note (a)

On the right side engine strut: Install a

new inboard midspar fuse pin in accordance with the Accomplishment Instructions paragraphs 3.B.3.a.(2)(a) See

note (a)

On the right side engine strut: Install a

new outboard midspar fuse pin in accordance with the Accomplishment Instructions paragraphs 3.B.4.a.(2)(a) See

note (a)

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
Table 1: Engine strut midspar fuse pins replacement and detailed inspection

Repeat Interval (Not

to Exceed)

Compliance Time (Whichever Occurs

Later)

Condition Action

60 months.

See note

(b)

Within 24

months after

the date on

this service

bulletin.

Within 180

months from

date of previous pin replacement.

Within 180

months from

the date of issuance of

original standard certificate

of airworthiness or original export certificate of airworthiness.

On the left side engine strut: Do a detailed inspection of the inboard midspar

fuse pin in accordance with the Accomplishment Instructions paragraph

3.B.1.a.(2)(b)2) See notes (a) (b)

Airplanes

with engine

strut midspar

fuse pins

with part

number

311A1092-2. On the left side engine strut: Do a detailed inspection of the outboard

midspar fuse pin in accordance with

the Accomplishment Instructions paragraph 3.B.2.a.(2)(b)2) See notes (a)

(b)

On the right side engine strut: Do a

detailed inspection of the inboard

midspar fuse pin in accordance with

the Accomplishment Instructions paragraph 3.B.3.a.(2)(b)2) See notes (a)

(b)

On the right side engine strut: Do a

detailed inspection of the outboard

midspar fuse pin in accordance with

the Accomplishment Instructions paragraph 3.B.4.a.(2)(b)2) See notes (a)

(b)

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
Table 1: Engine strut midspar fuse pins replacement and detailed inspection

Repeat Interval (Not

to Exceed)

Compliance Time (Whichever Occurs

Later)

Condition Action

Before further - - -

flight.

On the left side engine strut inboard

midspar fuse pin: If the pin is damaged

install a new or serviceable midspar

fuse pin in accordance with the Accomplishment Instructions paragraph

3.B.1.a.(2)(b)3) See note (b)

If any crack

is found.

On the left side engine strut outboard

midspar fuse pin: If the pin is damaged

install a new or serviceable midspar

fuse pin in accordance with the Accomplishment Instructions paragraph

3.B.2.a.(2)(b)3) See note (b)

On the right side engine strut inboard

midspar fuse pin: If the pin is damaged

install a new or serviceable midspar

fuse pin in accordance with the Accomplishment Instructions paragraph

3.B.3.a.(2)(b)3) See note (b)

On the right side engine strut outboard

midspar fuse pin: If the pin is damaged

install a new or serviceable midspar

fuse pin in accordance with the Accomplishment Instructions paragraph

3.B.4.a.(2)(b)3) See note (b)

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
Table 1: Engine strut midspar fuse pins replacement and detailed inspection

Repeat Interval (Not

to Exceed)

Compliance Time (Whichever Occurs

Later)

Condition Action

Before further - - -

flight

On the left side engine strut inboard

midspar fuse pin: If the pin is damaged

install a new or serviceable midspar

fuse pin in accordance with the Accomplishment Instructions paragraph

3.B.1.a.(2)(b)3) See note (b)

If any pitting

or corrosion

damage is

found in the

inner bore,

threads, or

under the

chromed

area.

On the left side engine strut outboard

midspar fuse pin: If the pin is damaged

install a new or serviceable midspar

fuse pin in accordance with the Accomplishment Instructions paragraph

3.B.2.a.(2)(b)3) See note (b)

On the right side engine strut inboard

midspar fuse pin: If the pin is damaged

install a new or serviceable midspar

fuse pin in accordance with the Accomplishment Instructions paragraph

3.B.3.a.(2)(b)3) See note (b)

On the right side engine strut outboard

midspar fuse pin: If the pin is damaged

install a new or serviceable midspar

fuse pin in accordance with the Accomplishment Instructions paragraph

3.B.4.a.(2)(b)3) See note (b)

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
Table 1: Engine strut midspar fuse pins replacement and detailed inspection

Repeat Interval (Not

to Exceed)

Compliance Time (Whichever Occurs

Later)

Condition Action

Before further - - -

flight.

On the left side engine strut inboard

midspar fuse pin: If the pin is damaged

install a new or serviceable midspar

fuse pin in accordance with the Accomplishment Instructions paragraph

3.B.1.a.(2)(b)3) See note (b)

If any pitting

or corrosion

damage is

found not

common to

the inner

bore,

threads, or

under the

chromed

area and requires a

blend depth

more than

0.010 inch.

On the left side engine strut outboard

midspar fuse pin: If the pin is damaged

install a new or serviceable midspar

fuse pin in accordance with the Accomplishment Instructions paragraph

3.B.2.a.(2)(b)3) See note (b)

On the right side engine strut inboard

midspar fuse pin: If the pin is damaged

install a new or serviceable midspar

fuse pin in accordance with the Accomplishment Instructions paragraph

3.B.3.a.(2)(b)3) See note (b)

On the right side engine strut outboard

midspar fuse pin: If the pin is damaged

install a new or serviceable midspar

fuse pin in accordance with the Accomplishment Instructions paragraph

3.B.4.a.(2)(b)3) See note (b)

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
Table 1: Engine strut midspar fuse pins replacement and detailed inspection

Repeat Interval (Not

to Exceed)

Compliance Time (Whichever Occurs

Later)

Condition Action

Before further - - -

flight.

On the left side engine strut inboard

midspar fuse pin:

If any pitting

or corrosion

damage is

found not

common to

the inner

bore,

threads, or

under the

chromed

area and requires a

blend depth

less than or

equal to

0.010 inch.

If the fuse pin is damaged, repair in

accordance with Accomplishment Instructions paragraph

3.B.1.a.(2)(b)2)d){1} and install the

serviceable midspar fuse pin in accordance with the Accomplishment Instructions paragraph 3.B.1.a.(2)(b)3)

Or

If the pin is damaged install a new or

serviceable midspar fuse pin in accordance with the Accomplishment Instructions paragraph 3.B.1.a.(2)(b)3) See

note (b)

On the left side engine strut outboard

midspar fuse pin:

If the fuse pin is damaged, repair in

accordance with Accomplishment Instructions paragraph

3.B.2.a.(2)(b)2)d){1} and install the

serviceable midspar fuse pin in accordance with the Accomplishment Instructions paragraph 3.B.2.a.(2)(b)3)

Or

If the pin is damaged install a new or

serviceable midspar fuse pin in accordance with the Accomplishment Instructions paragraph 3.B.2.a.(2)(b)3) See

note (b)

On the right side engine strut inboard

midspar fuse pin:

If the fuse pin is damaged, repair in

accordance with Accomplishment Instructions paragraph

3.B.3.a.(2)(b)2)d){1} and install the

serviceable midspar fuse pin in accordance with the Accomplishment Instructions paragraph 3.B.3.a.(2)(b)3)

Or

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
Table 1: Engine strut midspar fuse pins replacement and detailed inspection

Repeat Interval (Not

to Exceed)

Compliance Time (Whichever Occurs

Later)

Condition Action

If the pin is damaged install a new or

serviceable midspar fuse pin in accordance with the Accomplishment Instructions paragraph 3.B.3.a.(2)(b)3) See

note (b)

On the right side engine strut outboard

midspar fuse pin:

If the fuse pin is damaged, repair in

accordance with Accomplishment Instructions paragraph

3.B.4.a.(2)(b)2)d){1} and install the

serviceable midspar fuse pin in accordance with the Accomplishment Instructions paragraph 3.B.4.a.(2)(b)3)

Or

If the pin is damaged install a new or

serviceable midspar fuse pin in accordance with the Accomplishment Instructions paragraph 3.B.4.a.(2)(b)3) See

note (b)

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
Table 1: Engine strut midspar fuse pins replacement and detailed inspection

Repeat Interval (Not

to Exceed)

Compliance Time (Whichever Occurs

Later)

Condition Action

Before further - - -

flight.

On the left side engine strut inboard

midspar fuse pin: Install a new or serviceable midspar fuse pin in accordance with the Accomplishment Instructions paragraph 3.B.1.a.(2)(b)3) See

note (b)

If no cracking, pitting,

corrosion or

chrome plate

damage is

found.

On the left side engine strut outboard

midspar fuse pin: Install a new or serviceable midspar fuse pin in accordance with the Accomplishment Instructions paragraph 3.B.2.a.(2)(b)3) See

note (b)

On the right side engine strut inboard

midspar fuse pin: Install a new or serviceable midspar fuse pin in accordance with the Accomplishment Instructions paragraph 3.B.3.a.(2)(b)3) See

note (b)

On the right side engine strut outboard

midspar fuse pin: Install a new or serviceable midspar fuse pin in accordance with the Accomplishment Instructions paragraph 3.B.4.a.(2)(b)3) See

note (b)

(a) No action is required if a midspar fuse pin with part number 311A1092-3 is already installed at this location.

(b) For each midspar fuse pin location, the installation of a new midspar fuse pin with part number 311A1092-

3 terminates the requirement for inspections at that location.

F. Approval

This service bulletin was examined by the Federal Aviation Administration (FAA). The changes specified

in this service bulletin comply with the applicable regulations and are FAA approved, as well as European

Aviation Safety Agency (EASA)/Joint Aviation Authorities (JAA) approved for all EASA/JAA approved

airplanes listed in the service bulletin effectivity. This service bulletin and its approval were based on

the airplane in its original Boeing delivery configuration or as modified by other approved Boeing

changes.

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
In addition, the Manager of the Seattle Aircraft Certification Office approves the accomplishment of the

inspections, repairs, and modifications specified in Section 1.E., Compliance, of SB 737-54-1044,

Revision 1 or SB 737-54A1044, Revision 2 as an AMOC to the applicable inspections and repairs

required by paragraph (f) of AD 2008-21-03. All provisions of AD 2008-21-03 that are not specifically

referenced in the preceding sentence remain fully applicable and must be complied with. Replacement

of the existing midspar fuse pin with the new dash number fuse pin per Section 1.E, Table 1, Note (b)

of Service Bulletin 737-54-1044, Revision 1, or 737-54A1044, Revision 2 terminates the inspections

required by paragraph (f) of AD 2008-21-03.

If an airplane has a non-Boeing modification or repair that affects a component or system also affected

by this service bulletin, the operator is responsible for obtaining appropriate regulatory agency approval

before incorporating this service bulletin.

G. Manpower

The table below shows an estimate of the task-hours necessary to do this inspection for each airplane.

This estimate is for direct labor only, done by an experienced crew. Adjust the estimate with operator

task-hour data if necessary. The estimate does not include lost time. These are some examples of lost

time:

— Time to adjust to the workplace

— Time to schedule the work

— Time to examine the work

— Time to cure the materials

— Time to make the parts

— Time to find the tools.

Midspar Fuse Pin - Inspection and replacement

Number of Per- Task-Hours Elapsed Hours

sons

Task

Open Access (a) 2 6.50 3.25

Figure 1 1 1.50 1.50

Figure 2 1 1.50 1.50

Close Access (b) 2 6.50 3.25

TOTAL FOR EACH AIRPLANE 16.00 9.50

(a) This includes time for the removal of the midspar fuse pins.

(b) This includes time for the installation of the midspar fuse pins.

H. Weight and Balance Changes

None.

I. Electrical Load Data

Not changed.

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
J. References

1. Existing Data:

a. Engineering Change Memo PRR 35005-273RS.

b. 737-300/400/500 Aircraft Maintenance Manual (AMM) 54-10-00, 54-10-01.

c. Boeing Drawing 65-88700.

d. Service Related Problem (SRP) 737-SRP-54-0115.

e. Standard Overhaul Practices Manual (SOPM) 20-30-03, 20-41-02, 20-42-10.

f. Boeing Component Maintenance Manual (CMM) 54-50-01

g. 737-300/400/500 Structural Repair Manual (SRM) Chapter 51

h. Federal Aviation Administration (FAA) Airworthiness Directive AD 2008-21-03

2. Data supplied with this Service Bulletin:

None.

3. Installation Drawings Used in the Preparation of this Service Bulletin:

Drawing Number Title

310A1030 STRUT MOUNT INSTALLATION - CFM56-3 ENGINE

This drawing was used to prepare this service bulletin. This drawing is not necessary to make the

specified changes, and is not supplied with this service bulletin. This drawing may not be applicable

to all airplane configurations or operators.

K. Publications Affected

1. Publications:

Publication Chapter-Section

737 Illustrated Parts Catalog 54-42

Component Maintenance Manual 54-50-01

2. Damage Tolerance Based Structural Inspections:

Boeing has evaluated the repairs and/or changes in this service bulletin for effects on Fatigue

Critical Structure (FCS) and for changes to Damage Tolerance Inspections (DTI) required in the

Maintenance Program. This service bulletin affects FCS but no new DTIs are necessary.

L. Interchangeability and Intermixability of Parts

Accomplishment of this service bulletin does not affect interchangeability or intermixability of parts.

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT

BLANK PAGE
2. MATERIAL INFORMATION

A. Material - Price and Availability

None.

B. Industry Support Information

Boeing warranty remedies are not available for the configuration changes inspection, and/or repair

procedures given in this service bulletin.

C. Parts Necessary For Each Airplane

1. Kits/Parts:

None.

2. Parts and Materials Supplied by the Operator:

Part Number / QTY Name Notes

Specification

311A1092-3 1 Fuse Pin (b)(f)

311A1092-2 1 Fuse Pin (b)(f)

BMS10-11, Type I 4 Ounces Primer (a)(c)

Low Hydrogen Embrittlement Stylus (c)(d)

Cadmium Plate

SPS-5070 4 Ounces

ASTM D 740 8 Ounces Methyl Ethyl Ketone (MEK) Solvent (e)

(a) See the Qualified Products List at the end of the Boeing Material Specification (BMS) for supplier data.

(b) This part is only necessary if the midspar fuse pin is replaced. The quantity shown is for one

midspar fuse pin replacement. There are four midspar fuse pins on an airplane.

(c) This part is only necessary if the midspar fuse pin is repaired. The quantity shown is an estimate

for one midspar fuse pin. There are four midspar fuse pins on an airplane.

(d) Refer to SOPM 20-42-10 for supplier details.

(e) Refer to SOPM 20-30-03 for supplier details.

(f) Part 311A1092-2 is optional to 311A1092-3 for a limited time, however the requirement for repeat

inspections is not terminated if 311A1092-2 is used. Refer to Paragraph 1.E., Compliance.

3. Parts Modified and Reidentified:

None.

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
4. Parts Removed and Not Replaced:

Existing Part Name QTY Notes

Number

311A1097-1 WASHER 4

D. Parts Necessary to Change Spares

None.

E. Special Tooling - Price and Availability

None.

F. Special Tooling Necessary to do this Service Bulletin

No special tools or equipment are necessary to do the change in this service bulletin. But, maintenance

and overhaul tools in the manuals given in Paragraph 1.J., References, can be necessary. Examine

operator tool supply to make sure all necessary tools are available.

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
3. ACCOMPLISHMENT INSTRUCTIONS

A. GENERAL INFORMATION

CAUTION: KEEP THE WORK AREA, WIRES AND ELECTRICAL BUNDLES CLEAN OF METAL

PARTICLES OR CONTAMINATION WHEN YOU USE TOOLS. UNWANTED MATERIAL,

METAL PARTICLES OR CONTAMINATION CAUGHT IN WIRE BUNDLES CAN CAUSE

DAMAGE TO THE BUNDLES. DAMAGED WIRE BUNDLES CAN CAUSE SPARKS OR

OTHER ELECTRICAL DAMAGE.

NOTE: 1. Manual titles are referred to by acronyms. Refer to Paragraph 1.J., References, for

definition of the acronyms.

2. Obey all of the warnings and cautions given in the specified manual sections.

3. Unless shown differently, these dimensions and tolerances are used:

— Linear dimensions are in inches

— Torque limits to tighten nuts and bolts are given in 737 Structural Repair Manual,

Chapter 51.

4. For approved fastener and process material substitutions, refer to 737 Structural

Repair Manual, Chapter 51, Alternate fasteners are given in 737 Structural Repair

Manual Chapter 51 and Boeing Drawing 65-88700.

5. If the length of fasteners specified in this service bulletin do not meet the installation

standards, fasteners of the same specification, or an approved substitute, one grip

length longer or shorter may be used.

6. A Detailed Inspection is defined as: An intensive examination of a specific item,

installation, or assembly to detect damage, failure, or irregularity. Available lighting

is normally supplemented with a direct source of good lighting at an intensity deemed

appropriate. Inspection aids such as mirrors magnifying lenses, etc. may be

necessary. Surface cleaning and elaborate procedures may be required.

7. A General Visual Inspection is defined as: A visual examination of an interior or

exterior area, installation or assembly to detect obvious damage, failure or irregularity.

This level of inspection is made from within touching distance unless otherwise

specified. A mirror may be necessary to ensure visual access to all surfaces in the

inspection area. This level of inspection is made under normal available lighting

conditions such as daylight, hangar lighting, flashlight or drop-light and may require

removal or opening of access panels or doors. Stands, ladders or platforms may be

required to gain proximity to the area being checked.

8. These work instructions refer to procedures included on other Boeing documents.

When the words "refer to" are used and the operator has an accepted alternative

procedure, the accepted alternative procedure can be used. When the words "in

accordance with" are included in the instruction, the procedure in the Boeing document

must be used.

B. WORK INSTRUCTIONS

1. PART 1 - LEFT SIDE ENGINE STRUT - INBOARD - MIDSPAR FUSE PIN

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
a. Do a General Visual Inspection to identify the part number of the left side engine strut inboard

midspar fuse pin.

NOTE: The part number can be found on the head of the fuse pin.

(1) If the midspar fuse pin has part number 311A1092-3, no action is required.

(2) If the midspar fuse pin has part number 311A1092-2 or the part number cannot be found,

do one of the following:

(a) Install a midspar fuse pin with part number 311A1092-3:

NOTE: Installation of new midspar fuse pin with part number 311A1092-3 terminates

the requirement to do the repeat inspections of the left side engine strut

inboard midspar fuse pin. Refer to Paragraph 1.E., Compliance.

WARNING: REMOVE ONLY ONE MIDSPAR FUSE PIN AT A TIME. INJURY TO

PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.

1) Remove the left side engine strut inboard midspar fuse pin. Refer to

737-300/400/500 AMM 54-10-01 as an accepted procedure.

NOTE: As an option, remove the left side nacelle strut from the wing. Refer to

737-300/400/500 AMM 54-10-00 as an accepted procedure.

2) Install the left side engine strut inboard midspar fuse pin in accordance with

Figure 4.

(b) Inspect the midspar fuse pin that is currently installed:

WARNING: REMOVE ONLY ONE MIDSPAR FUSE PIN AT A TIME. INJURY TO

PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.

1) Remove the left side engine strut inboard midspar fuse pin. Refer to

737-300/400/500 AMM 54-10-01 as an accepted procedure.

NOTE: As an option, remove the left side nacelle strut from the wing. Refer to

737-300/400/500 AMM 54-10-00 as an accepted procedure.

2) Do a detailed inspection of the left side inboard midspar fuse pin for any cracking,

pitting, corrosion or chrome plate damage in accordance with Figure 1.

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
a) If any cracking is found, then discard the midspar fuse pin.

b) If any pitting, corrosion or chrome plate damage is found in the inner bore,

threads, or under the chromed area, then discard the midspar fuse pin.

c) If any pitting or corrosion damage is found not common to the inner bore,

threads, or under the chromed area and requires a blend depth more than

0.010 inch, then discard the midspar fuse pin.

d) If any pitting or corrosion damage is found not common to the inner bore,

threads, or under the chromed area and requires a blend depth less than

or equal to 0.010 inch, then do one of the steps that follow:

{1} Repair the midspar fuse pin in accordance with Figure 3.

{2} Discard the midspar fuse pin.

e) If no cracking, pitting, corrosion or chrome plate damage is found, then the

midspar fuse pin is serviceable and can be kept for re-installation.

3) Do one of the following:

a) Install the left side engine strut inboard midspar fuse pin with new part

number 311A1092-3 in accordance with Figure 4.

NOTE: Installation of new midspar fuse pin with part number 311A1092-3

terminates the requirement to do the repeat inspections of the left

side engine strut inboard midspar fuse pin. Refer to Paragraph

1.E., Compliance.

b) Install the left side engine strut inboard midspar fuse pin with new part

number 311A1092-2 or serviceable midspar fuse pin. Do not install part

number 311A1097-1 special washer under the head of the midspar fuse

pin. Refer to 737-300/400/500 AMM 54-10-01 as an accepted procedure.

4) Do the repeat detailed inspection at the interval specified in Paragraph 1.E.,

Compliance.

2. PART 2 - LEFT SIDE ENGINE STRUT - OUTBOARD - MIDSPAR FUSE PIN

a. Do a General Visual Inspection to identify the part number of the left side engine strut outboard

midspar fuse pin.

NOTE: The part number can be found on the head of the fuse pin.

(1) If the midspar fuse pin has part number 311A1092-3, no action is required.

(2) If the midspar fuse pin has part number 311A1092-2 or the part number cannot be found,

do one of the following:

(a) Install a midspar fuse pin with part number 311A1092-3:

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
NOTE: Installation of new midspar fuse pin with part number 311A1092-3 terminates

the requirement to do the repeat inspections of the left side engine strut

outboard midspar fuse pin. Refer to Paragraph 1.E., Compliance.

WARNING: REMOVE ONLY ONE MIDSPAR FUSE PIN AT A TIME. INJURY TO

PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.

1) Remove the left side engine strut outboard midspar fuse pin. Refer to

737-300/400/500 AMM 54-10-01 as an accepted procedure.

NOTE: As an option, remove the left side nacelle strut from the wing. Refer to

737-300/400/500 AMM 54-10-00 as an accepted procedure.

2) Install the left side engine strut outboard midspar fuse pin in accordance with

Figure 5.

(b) Inspect the midspar fuse pin that is currently installed:

WARNING: REMOVE ONLY ONE MIDSPAR FUSE PIN AT A TIME. INJURY TO

PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.

1) Remove the left side engine strut outboard midspar fuse pin. Refer to

737-300/400/500 AMM 54-10-01 as an accepted procedure.

NOTE: As an option, remove the left side nacelle strut from the wing. Refer to

737-300/400/500 AMM 54-10-00 as an accepted procedure.

2) Do a detailed inspection of the left side outboard midspar fuse pin for any

cracking, pitting, corrosion or chrome plate damage in accordance with Figure

1.

a) If any cracking is found, then discard the midspar fuse pin.

b) If any pitting, corrosion or chrome plate damage is found in the inner bore,

threads, or under the chromed area, then discard the midspar fuse pin.

c) If any pitting or corrosion damage is found not common to the inner bore,

threads, or under the chromed area and requires a blend depth more than

0.010 inch, then discard the midspar fuse pin.

d) If any pitting or corrosion damage is found not common to the inner bore,

threads, or under the chromed area and requires a blend depth less than

or equal to 0.010 inch, then do one of the steps that follow:

{1} Repair the midspar fuse pin in accordance with Figure 3.

{2} Discard the midspar fuse pin.

e) If no cracking, pitting, corrosion or chrome plate damage is found, then the

midspar fuse pin is serviceable and can be kept for re-installation.

3) Do one of the following:

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a) Install the left side engine strut outboard midspar fuse pin with new part

number 311A1092-3 in accordance with Figure 5.

NOTE: Installation of new midspar fuse pin with part number 311A1092-3

terminates the requirement to do the repeat inspections of the left

side engine strut outboard midspar fuse pin. Refer to Paragraph

1.E., Compliance.

b) Install the left side engine strut outboard midspar fuse pin with new part

number 311A1092-2 or serviceable midspar fuse pin. Do not install part

number 311A1097-1 special washer under the head of the midspar fuse

pin. Refer to 737-300/400/500 AMM 54-10-01 as an accepted procedure.

4) Do the repeat detailed inspection at the interval specified in Paragraph 1.E.,

Compliance.

3. PART 3 - RIGHT SIDE ENGINE STRUT - INBOARD - MIDSPAR FUSE PIN

a. Do a General Visual Inspection to identify the part number of the right side engine strut inboard

midspar fuse pin.

NOTE: The part number can be found on the head of the fuse pin.

(1) If the midspar fuse pin has part number 311A1092-3, no action is required.

(2) If the midspar fuse pin has part number 311A1092-2 or the part number cannot be found,

do one of the following:

(a) Install a midspar fuse pin with part number 311A1092-3:

NOTE: Installation of new midspar fuse pin with part number 311A1092-3 terminates

the requirement to do the repeat inspections of the right side engine strut

inboard midspar fuse pin. Refer to Paragraph 1.E., Compliance.

WARNING: REMOVE ONLY ONE MIDSPAR FUSE PIN AT A TIME. INJURY TO

PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.

1) Remove the right side engine strut inboard midspar fuse pin. Refer to

737-300/400/500 AMM 54-10-01 as an accepted procedure.

NOTE: As an option, remove the right side nacelle strut from the wing. Refer

to 737-300/400/500 AMM 54-10-00 as an accepted procedure.

2) Install the right side engine strut inboard midspar fuse pin in accordance with

Figure 6.

(b) Inspect the midspar fuse pin that is currently installed:

WARNING: REMOVE ONLY ONE MIDSPAR FUSE PIN AT A TIME. INJURY TO

PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.

1) Remove the right side engine strut inboard midspar fuse pin. Refer to

737-300/400/500 AMM 54-10-01 as an accepted procedure.

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
NOTE: As an option, remove the right side nacelle strut from the wing. Refer

to 737-300/400/500 AMM 54-10-00 as an accepted procedure.

2) Do a detailed inspection of the right side inboard midspar fuse pin for any

cracking, pitting, corrosion or chrome plate damage in accordance with Figure

2.

a) If any cracking is found, then discard the midspar fuse pin.

b) If any pitting, corrosion or chrome plate damage is found in the inner bore,

threads, or under the chromed area, then discard the midspar fuse pin.

c) If any pitting or corrosion damage is found not common to the inner bore,

threads, or under the chromed area and requires a blend depth more than

0.010 inch, then discard the midspar fuse pin.

d) If any pitting or corrosion damage is found not common to the inner bore,

threads, or under the chromed area and requires a blend depth less than

or equal to 0.010 inch, then do one of the steps that follow:

{1} Repair the midspar fuse pin in accordance with Figure 3.

{2} Discard the midspar fuse pin.

e) If no cracking, pitting, corrosion or chrome plate damage is found, then the

midspar fuse pin is serviceable and can be kept for re-installation.

3) Do one of the following:

a) Install the right side engine strut inboard midspar fuse pin with new part

number 311A1092-3 in accordance with Figure 6.

NOTE: Installation of new midspar fuse pin with part number 311A1092-3

terminates the requirement to do the repeat inspections of the right

side engine strut inboard midspar fuse pin. Refer to Paragraph

1.E., Compliance.

b) Install the right side engine strut inboard midspar fuse pin with new part

number 311A1092-2 or serviceable midspar fuse pin. Do not install part

number 311A1097-1 special washer under the head of the midspar fuse

pin. Refer to 737-300/400/500 AMM 54-10-01 as an accepted procedure.

4) Do the repeat detailed inspection at the interval specified in Paragraph 1.E.,

Compliance.

4. PART 4 - RIGHT SIDE ENGINE STRUT - OUTBOARD - MIDSPAR FUSE PIN

a. Do a General Visual Inspection to identify the part number of the right side engine strut outboard

midspar fuse pin.

NOTE: The part number can be found on the head of the fuse pin.

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
(1) If the midspar fuse pin has part number 311A1092-3, no action is required.

(2) If the midspar fuse pin has part number 311A1092-2 or the part number cannot be found,

do one of the following:

(a) Install a midspar fuse pin with part number 311A1092-3:

NOTE: Installation of new midspar fuse pin with part number 311A1092-3 terminates

the requirement to do the repeat inspections of the right side engine strut

outboard midspar fuse pin. Refer to Paragraph 1.E., Compliance.

WARNING: REMOVE ONLY ONE MIDSPAR FUSE PIN AT A TIME. INJURY TO

PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.

1) Remove the right side engine strut outboard midspar fuse pin. Refer to

737-300/400/500 AMM 54-10-01 as an accepted procedure.

NOTE: As an option, remove the right side nacelle strut from the wing. Refer

to 737-300/400/500 AMM 54-10-00 as an accepted procedure.

2) Install the right side engine strut outboard midspar fuse pin in accordance with

Figure 7.

(b) Inspect the midspar fuse pin that is currently installed:

WARNING: REMOVE ONLY ONE MIDSPAR FUSE PIN AT A TIME. INJURY TO

PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.

1) Remove the right side engine strut outboard midspar fuse pin. Refer to

737-300/400/500 AMM 54-10-01 as an accepted procedure.

NOTE: As an option, remove the right side nacelle strut from the wing. Refer

to 737-300/400/500 AMM 54-10-00 as an accepted procedure.

2) Do a detailed inspection of the right side outboard midspar fuse pin for any

cracking, pitting, corrosion or chrome plate damage in accordance with Figure

2.

a) If any cracking is found, then discard the midspar fuse pin.

b) If any pitting, corrosion or chrome plate damage is found in the inner bore,

threads, or under the chromed area, then discard the midspar fuse pin.

c) If any pitting or corrosion damage is found not common to the inner bore,

threads, or under the chromed area and requires a blend depth more than

0.010 inch, then discard the midspar fuse pin.

d) If any pitting or corrosion damage is found not common to the inner bore,

threads, or under the chromed area and requires a blend depth less than

or equal to 0.010 inch, then do one of the steps that follow:

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
{1} Repair the midspar fuse pin in accordance with Figure 3.

{2} Discard the midspar fuse pin.

e) If no cracking, pitting, corrosion or chrome plate damage is found, then the

midspar fuse pin is serviceable and can be kept for re-installation.

3) Do one of the following:

a) Install the right side engine strut outboard midspar fuse pin with new part

number 311A1092-3 in accordance with Figure 7.

NOTE: Installation of new midspar fuse pin with part number 311A1092-3

terminates the requirement to do the repeat inspections of the right

side engine strut outboard midspar fuse pin. Refer to Paragraph

1.E., Compliance.

b) Install the right side engine strut outboard midspar fuse pin with new part

number 311A1092-2 or serviceable midspar fuse pin. Do not install part

number 311A1097-1 special washer under the head of the midspar fuse

pin. Refer to 737-300/400/500 AMM 54-10-01 as an accepted procedure.

4) Do the repeat detailed inspection at the interval specified in Paragraph 1.E.,

Compliance.

b. Put the airplane back to a serviceable condition.

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY

numbers shown below are the number of parts necessary to inspect.

FIGURE 1: LEFT SIDE ENGINE STRUT - INBOARD AND OUTBOARD - MIDSPAR FUSE PIN - INSPECTION

(SHEET 1 OF 2)

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
STEP TASK NAME IDENTIFICATION QTY MORE DATA

1 Clean Midspar Fuse Pin 311A1092-2 2 (a)

2 Inspect Midspar Fuse Pin Inner Bore 311A1092-2 2 (b)

3 Inspect Midspar Fuse Pin Thread 311A1092-2 2 (b)

4 Inspect Midspar Fuse Pin Shank 311A1092-2 2 (c)

5 Inspect Midspar Fuse Pin Head 311A1092-2 2 (b)

(a) Use methyl ethyl ketone to remove all dirt and grease. Refer to SOPM 20-30-03 as an accepted procedure.

(b) Do a detailed inspection for any cracking, pitting or corrosion damage.

(c) Do a detailed inspection for any cracking, pitting, corrosion or chrome plate damage.

FIGURE 1: LEFT SIDE ENGINE STRUT - INBOARD AND OUTBOARD - MIDSPAR FUSE PIN - INSPECTION

(SHEET 2 OF 2)

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY

numbers shown below are the number of parts necessary to inspect.

FIGURE 2: RIGHT SIDE ENGINE STRUT - INBOARD AND OUTBOARD - MIDSPAR FUSE PIN - INSPECTION

(SHEET 1 OF 2)

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
STEP TASK NAME IDENTIFICATION QTY MORE DATA

1 Clean Midspar Fuse Pin 311A1092-2 2 (a)

2 Inspect Midspar Fuse Pin Inner Bore 311A1092-2 2 (b)

3 Inspect Midspar Fuse Pin Thread 311A1092-2 2 (b)

4 Inspect Midspar Fuse Pin Shank 311A1092-2 2 (c)

5 Inspect Midspar Fuse Pin Head 311A1092-2 2 (b)

(a) Use methyl ethyl ketone to remove all dirt and grease. Refer to SOPM 20-30-03 as an accepted procedure.

(b) Do a detailed inspection for any cracking, pitting or corrosion damage.

(c) Do a detailed inspection for any cracking, pitting, corrosion or chrome plate damage.

FIGURE 2: RIGHT SIDE ENGINE STRUT - INBOARD AND OUTBOARD - MIDSPAR FUSE PIN - INSPECTION

(SHEET 2 OF 2)

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
The step numbers shown below agree with the numbers shown in the circle symbols in the figure.

STEP TASK NAME IDENTIFICATION QTY MORE DATA

Pitting or Corrosion - - (a)(b)(c)

Damage

1 Remove

2 Inspect Blended Areas - - (d)

Low Hydrogen - - (e)

Embrittlement Stylus Cadmium Plate

3 Apply

BMS 10-11, Type I - - (f)(g)

Primer

4 Apply

(a) Blend out the pitting or corrosion damage from the midspar fuse pin. Make sure the blend depth is less

than or equal to 0.010 inch.

(b) Taper out the damage area with a 10:1 inch taper.

(c) Surface finish to a 63 microinch RA smoothness or better.

(d) Do a detailed inspection of the blended areas to make sure all corrosion damage has been removed.

Use a 10X magnifying lens to aid the inspection.

(e) To the damaged area. Refer to SOPM 20-42-10 as an accepted procedure.

(f) Apply two coats of primer to the blended areas and any other areas showing primer loss. Refer to SOPM

20-41-02 as an accepted procedure.

(g) Do not apply primer to the threads or chrome areas of the midspar fuse pin.

FIGURE 3: MIDSPAR FUSE PIN - REPAIR

(SHEET 1 OF 1)

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
FIGURE 4: LEFT SIDE ENGINE STRUT - INBOARD - MIDSPAR FUSE PIN - INSTALLATION OF NEW

MATERIAL FUSE PIN

(SHEET 1 OF 3)

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY

numbers shown below are the number of new parts necessary for this location.

FIGURE 4: LEFT SIDE ENGINE STRUT - INBOARD - MIDSPAR FUSE PIN - INSTALLATION OF NEW

MATERIAL FUSE PIN

(SHEET 2 OF 3)

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
STEP TASK NAME IDENTIFICATION QTY MORE DATA

1 Install (New) Fuse Pin 311A1092-3 1 (a) (b)

(a) Do not install part number 311A1097-1 special washer under the head of the fuse pin.

(b) Refer to737-300/400/500 AMM 54-10-01as an accepted procedure.

FIGURE 4: LEFT SIDE ENGINE STRUT - INBOARD - MIDSPAR FUSE PIN - INSTALLATION OF NEW

MATERIAL FUSE PIN

(SHEET 3 OF 3)

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
FIGURE 5: LEFT SIDE ENGINE STRUT - OUTBOARD - MIDSPAR FUSE PIN - INSTALLATION OF NEW

MATERIAL FUSE PIN

(SHEET 1 OF 3)

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY

numbers shown below are the number of new parts necessary for this location.

FIGURE 5: LEFT SIDE ENGINE STRUT - OUTBOARD - MIDSPAR FUSE PIN - INSTALLATION OF NEW

MATERIAL FUSE PIN

(SHEET 2 OF 3)

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
STEP TASK NAME IDENTIFICATION QTY MORE DATA

1 Install (New) Fuse Pin 311A1092-3 1 (a) (b)

(a) Do not install part number 311A1097-1 special washer under the head of the fuse pin.

(b) Refer to 737-300/400/500 AMM 54-10-01 as an accepted procedure.

FIGURE 5: LEFT SIDE ENGINE STRUT - OUTBOARD - MIDSPAR FUSE PIN - INSTALLATION OF NEW

MATERIAL FUSE PIN

(SHEET 3 OF 3)

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
FIGURE 6: RIGHT SIDE ENGINE STRUT - INBOARD - MIDSPAR FUSE PIN - INSTALLATION OF NEW

MATERIAL FUSE PIN

(SHEET 1 OF 3)

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY

numbers shown below are the number of new parts necessary for this location.

FIGURE 6: RIGHT SIDE ENGINE STRUT - INBOARD - MIDSPAR FUSE PIN - INSTALLATION OF NEW

MATERIAL FUSE PIN

(SHEET 2 OF 3)

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
STEP TASK NAME IDENTIFICATION QTY MORE DATA

1 Install (New) Fuse Pin 311A1092-3 1 (a) (b)

(a) Do not install part number 311A1097-1 special washer under the head of the fuse pin.

(b) Refer to 737-300/400/500 AMM 54-10-01 as an accepted procedure.

FIGURE 6: RIGHT SIDE ENGINE STRUT - INBOARD - MIDSPAR FUSE PIN - INSTALLATION OF NEW

MATERIAL FUSE PIN

(SHEET 3 OF 3)

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
FIGURE 7: RIGHT SIDE ENGINE STRUT - OUTBOARD - MIDSPAR FUSE PIN - INSTALLATION OF NEW

MATERIAL FUSE PIN

(SHEET 1 OF 3)

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY

numbers shown below are the number of new parts necessary for this location.

FIGURE 7: RIGHT SIDE ENGINE STRUT - OUTBOARD - MIDSPAR FUSE PIN - INSTALLATION OF NEW

MATERIAL FUSE PIN

(SHEET 2 OF 3)

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT
STEP TASK NAME IDENTIFICATION QTY MORE DATA

1 Install (New) Fuse Pin 311A1092-3 1 (a) (b)

(a) Do not install part number 311A1097-1 special washer under the head of the fuse pin.

(b) Refer to 737-300/400/500 AMM 54-10-01 as an accepted procedure.

FIGURE 7: RIGHT SIDE ENGINE STRUT - OUTBOARD - MIDSPAR FUSE PIN - INSTALLATION OF NEW

MATERIAL FUSE PIN

(SHEET 3 OF 3)

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BOEING SERVICE BULLETIN 737-54A1044

ALERT ALERT