Commercial 

Airplanes 737

Service Bulletin

SPECIAL ATTENTION

Number: 737-28-1303

Original Issue: April 26, 2012

ATA System: 2800

SUBJECT: FUEL - General - Left Environmental Control Systems Bay Wire Clamp - Inspection

and Replacement

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

CFR 300-774). 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 © 2012 Boeing.

Unpublished Work. All Rights Reserved.

Treatment of this document and its content is governed by contract with Boeing. Rights to use this document

are licensed on a per aircraft basis and such rights may not be transferable. For more information, contact The

Boeing Company.

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

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 Boeing

liveries are all trademarks owned by The Boeing Company; and no trademark license is granted in connection

with this document unless provided in writing by Boeing. BOEING is a trademark of Boeing Management

Company.

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9.0
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BLANK PAGE
Table of Contents

Summary ...................................................... 5

1. PLANNING INFORMATION ........................................ 9

A. Effectivity ................................................ 9

1. Airplanes ............................................. 9

2. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

B. Concurrent Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

C. Reason . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

D. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

E. Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

F. Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

G. Manpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

H. Weight and Balance Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

I. Electrical Load Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

J. References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

1. Existing Data: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2. Data Supplied with this Service Bulletin: . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3. Installation Drawings Used in the Preparation of this Service Bulletin: . . . . . . . . . . . 17

K. Publications Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

L. Interchangeability and Intermixability of Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

M. Software Accomplishment Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

2. MATERIAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

A. Material - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

B. Industry Support Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

C. Parts Necessary for Each Airplane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

1. Kits/Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2. Parts and Materials Supplied by the Operator . . . . . . . . . . . . . . . . . . . . . . . . 19

3. Parts Modified and Reidentified . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

4. Parts Removed and Not Replaced . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

D. Parts Necessary to Change Spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

E. Special Tooling - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

F. Special Tooling Necessary to do this Service Bulletin . . . . . . . . . . . . . . . . . . . . . . . 20

3. ACCOMPLISHMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

A. GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

B. WORK INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

FIGURE 1: LEFT SIDE - ENVIRONMENTAL CONTROL SYSTEMS (ECS) BAY - WIRE CLAMP -

INSPECTION [Group 1] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

FIGURE 2: LEFT SIDE - ENVIRONMENTAL CONTROL SYSTEMS (ECS) BAY - WIRE CLAMP -

INSPECTION [Group 2] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

FIGURE 3: LEFT SIDE - ENVIRONMENTAL CONTROL SYSTEMS (ECS) BAY - WIRE CLAMP -

REPLACEMENT [Group 1] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

FIGURE 4: LEFT SIDE - ENVIRONMENTAL CONTROL SYSTEMS (ECS) BAY - WIRE CLAMP -

REPLACEMENT [Group 2] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

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BLANK PAGE
Commercial 

Airplanes 737

Service Bulletin

SPECIAL ATTENTION

Summary Number: 737-28-1303

Original Issue: April 26, 2012

ATA System: 2800

SUBJECT: FUEL - General - Left Environmental Control Systems Bay Wire Clamp - Inspection

and Replacement

BOEING RECOMMENDS THAT EACH OPERATOR EXAMINE THIS SERVICE BULLETIN IMMEDIATELY.

CONCURRENT REQUIREMENTS

None.

BACKGROUND

This service bulletin gives instructions to inspect and replace incorrect wire bundle clamp(s) installed on a wire

bundle in the left Environmental Control Systems (ECS) bay. A fully cushioned clamp should be installed to

prevent potential conductor to clamp short circuits. If this service bulletin is not done, conductor to clamp short

circuits could produce arcing from a hot short and introduce a potential ignition source in the center wing tank

and a subsequent fire or explosion.

During a drawing review, Boeing found that some callouts for the fully cushioned wire bundle clamp were

accidentally left out from the production drawings in the left ECS bay. This could lead to the installation of an

incorrect clamp. It was found that the incorrect clamp could be installed at two locations on 737-600 and -700

airplanes and one location on 737-800 and 900ER airplanes. The clamp(s) that should have been installed are

fully cushioned and part of the Special Federal Aviation Regulation (SFAR) 88 requirement. The production

drawings have now been corrected and airplane line number 3488 and subsequent have the correct clamp(s)

installed. Boeing initiated this service bulletin to address this condition.

Accomplishment of this service bulletin replaces incorrect wire bundle clamp(s) installed in the left ECS bay with

fully cushioned clamp(s). Installation of fully cushioned clamp(s) will prevent an electrical fault current paths to

the center wing tank caused by wiring hot shorts.

Boeing Service Related Problem (SRP) 737-SRP-28-0136 is related to this service bulletin.

Boeing Fleet Team Digest (FTD) 737NG-FTD-28-11001 is related to this service bulletin.

This table is provided to operators for planning purposes only. Refer to the applicable sections for more

information.

Planning Data Affected Reference

Spares Affected No Paragraph 1.A.2., Spares Affected

AD Related No Paragraph 1.E., Compliance

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Planning Data Affected Reference

Weight and Balance Change No Paragraph 1.H., Weight and Balance Changes

Electrical Load Changed No Paragraph 1.I., Electrical Load Data

Publications Affected No Paragraph 1.K., Publications Affected

Airplane Flight Operations Affected (Flight Crew No Paragraph 1.K., Publications Affected

Operations Manual and/or FAA Approved Airplane Flight Manual)

Kits/Parts Required No Paragraph 2.C.1., Kits/Parts

Paragraph 2.C.2., Parts and Materials Supplied

by the Operator

Operator Supplied Material Yes

Paragraph 2.F., Special Tooling Necessary to

do this Service Bulletin

Special Tooling Required No

ACTION

Get access to the left side ECS bay by opening the ECS bay access door 192CL. Do a Detailed Inspection of

the wire clamp installed at specified location(s). If TA0930034-10 clamp has not been installed, remove the

clamp and install a TA0930034-10 fully cushioned wire clamp. Close left side ECS bay access door 192CL.

EFFECTIVITY

737-600/-700/-800/-900ER Airplane(s). Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplane(s).

COMPLIANCE

The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to this service

bulletin. The Airworthiness Directive will make the compliance tasks and times given in this service bulletin

mandatory.

Boeing recommends that the inspection and change given in this service bulletin be done within 60 months after

the original issue date of this service bulletin.

INDUSTRY SUPPORT INFORMATION

Boeing warranty remedies are available for airplanes in warranty as of June 02, 2011. Please refer to Paragraph

2.B., Industry Support Information.

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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BLANK PAGE
Commercial 

Airplanes 737

Service Bulletin

SPECIAL ATTENTION

Number: 737-28-1303

Original Issue: April 26, 2012

ATA System: 2800

SUBJECT: FUEL - General - Left Environmental Control Systems Bay Wire Clamp - Inspection

and Replacement

BOEING RECOMMENDS THAT EACH OPERATOR EXAMINE THIS SERVICE BULLETIN IMMEDIATELY.

1. PLANNING INFORMATION

A. Effectivity

1. Airplanes

This service bulletin is for the airplane(s) shown below.

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

Serial Number data.

GROUP CONFIGURATION DESCRIPTION

737-600/-700 airplanes, line numbers 1820 thru 3487 that could have

two incorrect wire bundle clamps installed.

1 -

737-800/-900ER airplanes, line numbers 2007 thru 2040 and 2621

thru 3222 that could have one incorrect wire bundle clamp installed.

2 -

Airplane Models:

737-600, 737-700, 737-800, 737-900ER

Variable Number Group

YA977 - YA978 1

YB384 - YB392 1

YB575 1

YB578 - YB580 1

YB592 - YB598 1

YB633 - YB635 1

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Variable Number Group

YB671 - YB672 1

YB889 - YB893 1

YB964 - YB974 1

YB986 - YB996 1

YC095 2

YC743 2

YD415 - YD416 2

YE374 - YE383 1

YF001 - YF006 2

YF023 - YF039 2

YF046 2

YF052 - YF060 2

YF086 2

YF112 - YF114 2

YF116 - YF117 2

YF121 - YF122 2

YF191 - YF192 2

YF201 - YF241 2

YF401 - YF402 2

YF451 - YF454 2

YF501 - YF570 2

YF701 - YF705 2

YF801 2

YF831 - YF832 2

YF901 - YF902 2

YG094 - YG099 1

YG101 - YG103 1

YG111 - YG114 1

YG116 - YG128 1

YG203 - YG205 1

YG212 - YG214 1

YG221 - YG224 1

YG251 - YG252 1

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BOEING SERVICE BULLETIN 737-28-1303
Variable Number Group

YH011 - YH012 2

YH031 - YH047 2

YH054 - YH055 2

YH111 - YH130 2

YH207 2

YH301 - YH305 2

YH321 - YH322 2

YJ006 2

YJ010 2

YJ554 - YJ556 2

YJ565 - YJ575 2

YJ597 - YJ599 2

YJ874 - YJ880 2

YJ909 - YJ910 2

YK133 2

YK176 - YK177 2

YK186 2

YK191 2

YK196 2

YK201 - YK202 2

YK310 - YK312 2

YK333 2

YK338 - YK340 2

YK375 - YK378 2

YK437 - YK439 2

YK461 - YK465 2

YK471 2

YK486 - YK487 2

YK496 - YK497 2

YK521 - YK529 2

YK563 - YK565 2

YK567 - YK570 2

YK576 2

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BOEING SERVICE BULLETIN 737-28-1303
Variable Number Group

YK580 2

YK615 - YK616 2

YK626 - YK630 2

YK632 2

YK661 - YK664 2

YK671 - YK672 2

YK676 - YK677 2

YK681 - YK686 2

YK691 2

YK713 2

YK722 - YK723 2

YK759 - YK770 2

YK776 - YK778 2

YK885 - YK899 2

YK911 - YK912 2

YK919 2

YK952 - YK956 2

YK961 2

YK972 - YK980 2

YK985 - YK992 2

YL005 2

YL115 - YL130 2

YL208 - YL218 2

YL283 - YL284 2

YL320 - YL321 2

YL351 - YL353 2

YL374 2

YL401 2

YL427 - YL429 2

YL438 - YL444 2

YL473 - YL478 2

YL506 - YL509 2

YL534 2

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BOEING SERVICE BULLETIN 737-28-1303
Variable Number Group

YL541 - YL544 2

YL562 - YL568 2

YL592 2

YL611 - YL612 2

YL616 - YL617 2

YL621 2

YL626 2

YL631 - YL633 2

YL662 - YL664 2

YL676 - YL681 2

YL691 2

YL701 - YL702 2

YL731 2

YL751 - YL752 2

YL761 - YL769 2

YL801 - YL809 2

YL905 - YL910 2

YL921 - YL930 2

YL933 - YL936 2

YL951 - YL960 2

YM206 - YM242 1

YM273 - YM299 1

YM301 - YM397 1

YM506 - YM515 1

YM553 1

YM581 - YM582 1

YM591 - YM599 1

YM631 - YM634 1

YM641 - YM652 1

YM671 - YM674 1

YM691 - YM698 1

YM701 - YM710 1

YM761 - YM765 1

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BOEING SERVICE BULLETIN 737-28-1303
Variable Number Group

YN002 - YN016 1

YN021 - YN024 1

YN061 1

YN071 - YN082 1

YN091 - YN092 1

YN101 - YN112 1

YN121 1

YN201 - YN202 1

YN211 - YN219 1

YN231 - YN235 1

YN261 1

YQ001 - YQ003 2

YQ011 2

2. Spares Affected

None.

B. Concurrent Requirements

None.

C. Reason

This service bulletin gives instructions to inspect and replace incorrect wire bundle clamp(s) installed

on a wire bundle in the left Environmental Control Systems (ECS) bay. A fully cushioned clamp should

be installed to prevent potential conductor to clamp short circuits. If this service bulletin is not done,

conductor to clamp short circuits could produce arcing from a hot short and introduce a potential ignition

source in the center wing tank and a subsequent fire or explosion.

During a drawing review, Boeing found that some callouts for the fully cushioned wire bundle clamp

were accidentally left out from the production drawings in the left ECS bay. This could lead to the

installation of an incorrect clamp. It was found that the incorrect clamp could be installed at two locations

on 737-600 and -700 airplanes and one location on 737-800 and 900ER airplanes. The clamp(s) that

should have been installed are fully cushioned and part of the Special Federal Aviation Regulation

(SFAR) 88 requirement. The production drawings have now been corrected and airplane line number

3488 and subsequent have the correct clamp(s) installed. Boeing initiated this service bulletin to address

this condition.

Accomplishment of this service bulletin replaces incorrect wire bundle clamp(s) installed in the left ECS

bay with fully cushioned clamp(s). Installation of fully cushioned clamp(s) will prevent an electrical fault

current paths to the center wing tank caused by wiring hot shorts.

Boeing Service Related Problem (SRP) 737-SRP-28-0136 is related to this service bulletin.

Export Controlled ECCN: 9E991 - BOEING

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BOEING SERVICE BULLETIN 737-28-1303
Boeing Fleet Team Digest (FTD) 737NG-FTD-28-11001 is related to this service bulletin.

D. Description

Get access to the left side ECS bay by opening the ECS bay access door 192CL. Do a Detailed

Inspection of the wire clamp installed at specified location(s). If TA0930034-10 clamp has not been

installed, remove the clamp and install a TA0930034-10 fully cushioned wire clamp. Close left side

ECS bay access door 192CL.

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

Group 1:

Affected Maintenance Zones

Model Zone

737-600, 737-700 192

Group 2:

Affected Maintenance Zones

Model Zone

737-800, 737-900ER 192

E. Compliance

The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to

this service bulletin. The Airworthiness Directive will make the compliance tasks and times given in this

service bulletin mandatory.

Boeing recommends that the inspection and change given in this service bulletin be done within 60

months after the original issue date of this service bulletin.

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.

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.

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BOEING SERVICE BULLETIN 737-28-1303
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 inspect the work

• Time to cure the materials

• Time to make the parts

• Time to find the tools.

Group 1:

Task Number of Persons Task Hours Elapsed Hours

Open Access 1 0.50 0.50

FIGURE 1 1 0.30 0.30

Left Side Primary 2 4.00 2.00

Heat Exchanger Removal

FIGURE 3 (a) 1 0.40 0.40

Left Side Primary 2 4.00 2.00

Heat Exchanger Installation

Close Access 1 0.50 0.50

TOTAL FOR EACH AIRPLANE (b) 9.30 5.30

(a) Estimate does not include time for repair if damage to the wire bundle is found.

(b) Estimate is based on correct installation of all wire clamps.

Group 2:

Task Number of Persons Task Hours Elapsed Hours

Open Access 1 0.50 0.50

FIGURE 2 1 0.15 0.15

FIGURE 4 (a) 1 0.40 0.40

Close Access 1 0.50 0.50

TOTAL FOR EACH AIRPLANE (b) 1.15 1.15

(a) Estimate does not include time for repair if damage to the wire bundle is found.

(b) Estimate is based on correct installation of all wire clamps.

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BOEING SERVICE BULLETIN 737-28-1303
H. Weight and Balance Changes

None.

I. Electrical Load Data

Not changed.

J. References

1. Existing Data:

a. Service Bulletin Index D6-19567

b. Standard Wiring Practices Manual (SWPM) 20-10-11, 20-10-12, 20-10-13, 20-10-19

c. 737-600/700/800/900 Aircraft Maintenance Manual (AMM) 06-41-00, 21-51-03

d. Service Related Problem (SRP) 737-SRP-28-0136

e. Fleet Team Digest (FTD) 737-FTD-28-11001

2. Data Supplied with this Service Bulletin:

None.

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

Drawing Number Title

288A1139 Wire Bundle Instl - Left, A/C Pack Bay and Wing to Body Fairing

The table above lists applicable drawings used to prepare this service bulletin. The drawings are

not necessary to make the specified changes, and are not supplied with this service bulletin. The

drawings may not be applicable to all airplane configurations or operators.

K. Publications Affected

1. Publications:

None.

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 does not affect FCS, therefore DTIs are not 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 737-28-1303
M. Software Accomplishment Summary

Not affected.

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BOEING SERVICE BULLETIN 737-28-1303
2. MATERIAL INFORMATION

A. Material - Price and Availability

The operator can supply the parts and materials shown in Paragraph 2.C., Parts Necessary for Each

Airplane,. As an alternative, operators can purchase the parts from Boeing Spares. This service bulletin

does not show the Boeing price and supply data.

B. Industry Support Information

Boeing warranty remedies are available for 737-600/700/800/900ER airplanes in warranty as of June

02, 2011. For inspection man hour reimbursement for airplanes in warranty as of that date, send a

warranty claim to Boeing Commercial Airplanes Group - Warranties. If the condition described in this

service bulletin is found during the inspection for airplanes in warranty as of that date and additional

man hours and kits, parts, and/or special tools are required, send a warranty claim to Boeing Commercial

Airplanes Group - Warranties. Please refer to this service bulletin number and reference the airplane

variable number(s) in your purchase order.

C. Parts Necessary for Each Airplane

1. Kits/Parts

None

2. Parts and Materials Supplied by the Operator

Group 1:

Part Number / QTY Name Notes

Specification

TA0930034-10 2 Saddle Clamp (a) (b)

(a) The Quantity shown is the maximum amount that may be necessary if the inspection

shows incorrect clamp installation.

(b) Can be procured from TA Aerospace, Kirkhill-TA Division of Esterline Technologies

Corporation, (84971), 28065 Franklin Parkway, Valencia, California, 91380-9031.

Group 2:

Part Number / QTY Name Notes

Specification

TA0930034-10 1 Saddle Clamp (a) (b)

(a) The Quantity shown is the maximum amount that may be necessary if the inspection

shows incorrect clamp installation.

(b) Can be procured from TA Aerospace, Kirkhill-TA Division of Esterline Technologies

Corporation, (84971), 28065 Franklin Parkway, Valencia, California, 91380-9031.

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BOEING SERVICE BULLETIN 737-28-1303
3. Parts Modified and Reidentified

None

4. Parts Removed and Not Replaced

None

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 737-28-1303
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. Use the approved fastener and process material substitutions in accordance with

SRM Chapter 51.

4. Refer to the SWPM 20-10-11 and SWPM 20-10-12 for the wire installation procedures,

and SWPM 20-10-19 for the wire separation requirements, as accepted procedures.

5. If the length of any fastener specified in this service bulletin does not meet installation

standards given in SRM Chapter 51, then a fastener of the same specification, or

an approved substitute, with a length which meets the installation standards given

in SRM Chapter 51 may be used. In addition, washers may be installed for fastener

grip length in accordance with SRM Chapter 51.

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. These work instructions refer to procedures included in 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.

8. The instructions in Paragraph 3.B., Work Instructions and the figures can include

operation of tools or test equipment. Boeing Engineering Tool Drawings, the Illustrated

Tool and Equipment Manual, and the Special Tool and Ground Handling Drawing

Index contain data on versions of the tools or test equipment that you can use. It is

permitted to use replaced tools. It is not permitted to use superseded tools.

9. If it is necessary to remove more parts for access, you can remove those parts. If

you can get access without removing identified parts, it is not necessary to remove

all of the identified parts. Jacking and shoring limitations must be observed.

10. Where the work instructions include installation of a kept part, a new or serviceable

part with the same part number can be installed as an alternative to the kept part.

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BOEING SERVICE BULLETIN 737-28-1303
B. WORK INSTRUCTIONS

1. Get access to the left side ECS bay by opening ECS bay access door 192CL. Refer to

737-600/700/800/900 AMM 06-41-00 as an accepted procedure.

2. Group 1:

Remove the primary heat exchanger to get access to the wire clamps. Refer to 737-600/700/800/900

AMM 21-51-03 as an accepted procedure.

3. Do a Detailed Inspection of the wire bundle to make sure that TA0930034-10 wire clamps are

installed in accordance with FIGURE 1 or FIGURE 2:

a. Group 1:

In accordance with FIGURE 1.

(1) If the installed wire clamps are not TA0930034-10, replace wire clamp installation in

accordance with FIGURE 3.

(2) If the installed wire clamps are TA0930034-10, no more work is necessary.

b. Group 2:

In accordance with FIGURE 2.

(1) If the installed wire clamp is not TA0930034-10, replace wire clamp installation in

accordance with FIGURE 4.

(2) If the installed wire clamp is TA0930034-10, no more work is necessary.

4. Group 1:

Install the primary heat exchanger. Refer to 737-600/700/800/900 AMM 21-51-03 as an accepted

procedure.

5. Close the left side ECS bay access door 192CL. Refer to 737-600/700/800/900 AMM 06-41-00

as an accepted procedure.

6. Put the airplane back in a serviceable condition.

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This Figure applies only to: Group 1.

FIGURE 1: LEFT SIDE - ENVIRONMENTAL CONTROL SYSTEMS (ECS) BAY - WIRE CLAMP - INSPECTION

(SHEET 1 OF 3)

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FIGURE 1: LEFT SIDE - ENVIRONMENTAL CONTROL SYSTEMS (ECS) BAY - WIRE CLAMP - INSPECTION

(SHEET 2 OF 3)

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BOEING SERVICE BULLETIN 737-28-1303
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 for this figure.

Step Task Name Identification Qty More Data

1 Inspect Clamp - 2 (a)

(a) Do a Detailed Inspection of the clamp to make sure that the flanged cushions completely surrounds the

two metal strap sections of the clamp. Inspect to make sure that the P/N of the clamp installed is a

TA0930034-10 clamp.

FIGURE 1: LEFT SIDE - ENVIRONMENTAL CONTROL SYSTEMS (ECS) BAY - WIRE CLAMP - INSPECTION

(SHEET 3 OF 3)

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This Figure applies only to: Group 2.

FIGURE 2: LEFT SIDE - ENVIRONMENTAL CONTROL SYSTEMS (ECS) BAY - WIRE CLAMP - INSPECTION

(SHEET 1 OF 3)

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BOEING SERVICE BULLETIN 737-28-1303
FIGURE 2: LEFT SIDE - ENVIRONMENTAL CONTROL SYSTEMS (ECS) BAY - WIRE CLAMP - INSPECTION

(SHEET 2 OF 3)

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BOEING SERVICE BULLETIN 737-28-1303
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 for this figure.

Step Task Name Identification Qty More Data

1 Inspect Clamp - 1 (a)

(a) Do a Detailed Inspection of the clamp to make sure that the flanged cushions completely surrounds the

two metal strap sections of the clamp. Inspect to make sure that the P/N of the clamp installed is a

TA0930034-10 clamp.

FIGURE 2: LEFT SIDE - ENVIRONMENTAL CONTROL SYSTEMS (ECS) BAY - WIRE CLAMP - INSPECTION

(SHEET 3 OF 3)

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This Figure applies only to: Group 1.

FIGURE 3: LEFT SIDE - ENVIRONMENTAL CONTROL SYSTEMS (ECS) BAY - WIRE CLAMP -

REPLACEMENT

(SHEET 1 OF 3)

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BOEING SERVICE BULLETIN 737-28-1303
FIGURE 3: LEFT SIDE - ENVIRONMENTAL CONTROL SYSTEMS (ECS) BAY - WIRE CLAMP -

REPLACEMENT

(SHEET 2 OF 3)

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BOEING SERVICE BULLETIN 737-28-1303
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 for this figure.

Step Task Name Identification Qty More Data

1 Remove / Keep Fasteners - 4 (a)

2 Remove Clamp - -

3 Inspect Wire Bundle - 1 (b)

4 Install (New) Clamp TA0930034-10 2 (c) (a)

5 Install (Kept) Fastener - 4 (c) (a)

(a) The Quantity shown is the maximum amount that is necessary if both clamps must be replaced.

(b) Do a Detailed Inspection of the wire bundle for chaffing at the specified clamp locations. If damaged wires

are found, repair damaged wires. Refer to SWPM 20-10-13 as an accepted procedure for damage conditions and repair instructions.

(c) Refer to SWPM 20-10-12 as an accepted procedure.

FIGURE 3: LEFT SIDE - ENVIRONMENTAL CONTROL SYSTEMS (ECS) BAY - WIRE CLAMP -

REPLACEMENT

(SHEET 3 OF 3)

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BOEING SERVICE BULLETIN 737-28-1303
This Figure applies only to: Group 2.

FIGURE 4: LEFT SIDE - ENVIRONMENTAL CONTROL SYSTEMS (ECS) BAY - WIRE CLAMP -

REPLACEMENT

(SHEET 1 OF 2)

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BOEING SERVICE BULLETIN 737-28-1303
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 for this figure.

Step Task Name Identification Qty More Data

1 Remove / Keep Fastener - 2

2 Remove Clamp - 1

3 Inspect Wire Bundle - - (a)

4 Install (New) Clamp TA0930034-10 1 (b)

5 Install (Kept) Fastener - 2 (b)

(a) Do a Detailed Inspection of the wire bundle for chaffing at the specified clamp location. If damaged wires

are found, repair damaged wires. Refer to SWPM 20-10-13 as an accepted procedure for damage conditions and repair instructions.

(b) Refer to SWPM 20-10-12 as an accepted procedure.

FIGURE 4: LEFT SIDE - ENVIRONMENTAL CONTROL SYSTEMS (ECS) BAY - WIRE CLAMP -

REPLACEMENT

(SHEET 2 OF 2)

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BOEING SERVICE BULLETIN 737-28-1303