Commercial 

Airplanes 747

Service Bulletin

SPECIAL ATTENTION

Number: 747-21-2544

Original Issue: January 15, 2013

Revision 1: September 30, 2013

ATA System: 2144

SUBJECT: AIR CONDITIONING - Aft Cargo Compartment Heating System - Marker and Tape

Installation

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 © 2013 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Unpublished Work.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, Dreamliner,

BBJ, DC-8, DC-9, DC-10, KC-10, KC-46, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8, 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.

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1 of 38

2.0
Export Controlled ECCN: 9E991 - BOEING

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BOEING SERVICE BULLETIN 747-21-2544

BLANK PAGE
Table of Contents

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

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

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

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

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

2. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

B. Concurrent Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

C. Reason . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

D. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

E. Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

F. Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

G. Manpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

H. Weight and Balance Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

I. Electrical Load Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

J. References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

1. Existing Data: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

2. Data Supplied with this Service Bulletin: . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

3. Installation Drawings Used in the Preparation of this Service Bulletin: . . . . . . . . . . . 19

K. Publications Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

L. Interchangeability and Intermixability of Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

M. Software Accomplishment Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2. MATERIAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

A. Material - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

B. Industry Support Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

C. Parts Necessary for Each Airplane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

1. Kits/Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

2. Parts and Materials Supplied by the Operator . . . . . . . . . . . . . . . . . . . . . . . . 22

3. Parts Modified and Reidentified . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

4. Parts Removed and Not Replaced . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

D. Parts Necessary to Change Spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

E. Special Tooling - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

F. Special Tooling Necessary to do this Service Bulletin . . . . . . . . . . . . . . . . . . . . . . . 23

3. ACCOMPLISHMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

A. GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

B. WORK INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

FIGURE 1: INSTALLATION OF TAPE AND MARKERS [Group 1] . . . . . . . . . . . . . . . . . . . . 26

FIGURE 2: INSTALLATION OF TAPE AND MARKERS [Group 2] . . . . . . . . . . . . . . . . . . . . 30

FIGURE 3: INSTALLATION OF TAPE AND MARKERS [Group 3] . . . . . . . . . . . . . . . . . . . . 34

APPENDIX A: MARKER EFFECTIVITY TABLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Export Controlled ECCN: 9E991 - BOEING

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BOEING SERVICE BULLETIN 747-21-2544
Export Controlled ECCN: 9E991 - BOEING

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BOEING SERVICE BULLETIN 747-21-2544

BLANK PAGE
Commercial 

Airplanes 747

Service Bulletin

SPECIAL ATTENTION

Revision Transmittal Sheet Number: 747-21-2544

Original Issue: January 15, 2013

Revision 1: September 30, 2013

ATA System: 2144

SUBJECT: AIR CONDITIONING - Aft Cargo Compartment Heating System - Marker and Tape

Installation

This revision includes all pages of the service bulletin.

COMPLIANCE INFORMATION RELATED TO THIS REVISION

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.

Airplanes RL421-RL430, RL432-RL436, RL451-RL456, RL461-RL462, RL471-RL481, RL491-RL492,

RL501-RL502, RL511-RL516, RL521-RL522, RL531-RL534, RL551, RL561, RL563-RL568, RL571-RL572,

RL576-RL577, RL579, RL581-RL586, RL674-RL675, RL683, RL684, RM030, RM403, RM431, RM441-RM443,

RM445, RM859, RM880, and RM888-RM890 were added to Group 1 of this service bulletin effectivity.

No more work is necessary on the airplane(s) changed in accordance with the original issue of this service

bulletin.

REASON FOR REVISION

This revision is sent to update the airplane effectivity by adding and removing airplanes. Airplanes were added

to the effectivity that are affected by the aft cargo overheat issue and should have this marker and tape installed.

The airplanes that were removed have dual cargo heat installed and are not affected by the aft cargo overheat

issue.

These sections were changed:

1. Summary, Compliance, Added possible AD paragraph.

2. Paragraph 1.A., Effectivity; added airplanes to Group 1.

3. Paragraph 1.C., Reason; Added Revision 01 statement.

4. Paragraph 1.D., Description; Added Revision 01 statement.

5. Paragraph 1.E., Compliance, Added possible AD paragraph.

6. Appendix A, Updated Marker Effectivity Table

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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

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Revision 1: September 30, 2013

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BOEING SERVICE BULLETIN 747-21-2544
Commercial 

Airplanes 747

Service Bulletin

SPECIAL ATTENTION

Summary Number: 747-21-2544

Original Issue: January 15, 2013

Revision 1: September 30, 2013

ATA System: 2144

SUBJECT: AIR CONDITIONING - Aft Cargo Compartment Heating System - Marker and Tape

Installation

BOEING RECOMMENDS THAT EACH OPERATOR EXAMINE THIS SERVICE BULLETIN IMMEDIATELY.

CONCURRENT REQUIREMENTS

None.

BACKGROUND

This service bulletin provides visual warning and information for cargo handlers to make sure that cargo does

not block the Zone Temperature Sensor (ZTS) in the bulk cargo compartment. Keeping the bulk cargo

compartment ZTS clear of cargo will prevent excessive temperatures in the aft lower lobe cargo compartment.

If this service bulletin is not done, the aft lower lobe cargo compartment could overheat and if present, temperature

sensitive cargo may release flammable vapors which could result in a fire or explosion if exposed to an ignition

source.

One operator has reported very high temperatures, up to 67 Degrees Celsius near the floor in the aft lower lobe

cargo compartment. This occurred when the Aft Cargo Air Conditioning (ACAC) was selected OFF and Aft Cargo

Heat was selected ON. The operator also noted that loose cargo blocked the cover plate for the Bulk Cargo

Zone Temperature Sensor (ZTS).

The Aft Cargo Heat system is controlled by three temperature switches (two control switches and one overheat

switch) located in the Bulk Zone ZTS Assembly. When the air inlet to this assembly becomes blocked by loaded

or shifted cargo, the temperature switches fail to receive an adequate sample of compartment air. Under these

conditions, the switches will not command the system valves properly. Since the temperature inside the ZTS

Assembly will be influenced by the cold cheek temperatures, the result is that the switches may fail to shut off

the flow of hot air to the lower lobe cargo compartment, causing compartment temperatures to rise beyond 60

degrees C. Temperature sensitive cargo must be packaged to prevent exposure to high temperatures only if

the contents begin to give off flammable vapors below 60 Degrees Celsius. Flammable vapors can be released

into the aft lower lobe cargo compartment if temperature sensitive cargo is present that releases flammable

vapors above 60 Degrees Celsius.

This service bulletin installs black and yellow striped tape and a marker that provides information for cargo

handlers. By adding an additional marker and tape this will provide a warning that cargo must be placed away

from the ZTS in the bulk cargo compartment so that temperature readings are not adversely affected.

Boeing Service Related Problem (SRP) 747-SRP-21-0194 is related to this service bulletin.

Export Controlled ECCN: 9E991 - BOEING

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Boeing Fleet Team Digest (FTD) 747 FTD 21-12008 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

Paragraph 1.E., Compliance and Paragraph

1.F., Approval

AD Related Yes

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

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

Publications Affected Yes 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 Yes Paragraph 2.C.1., Kits/Parts

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

by the Operator

Operator Supplied Parts/Material Yes

Paragraph 2.F., Special Tooling Necessary to

do this Service Bulletin

Special Tooling Required No

ACTION (PRR 85901-121S)

Remove existing marker. Install tape. Install markers.

EFFECTIVITY

747-400, 747-400D, 747-400F, 747-8, 747-8F 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 change given in this service bulletin be done within 12 months after the Revision

01 date of this service bulletin.

INDUSTRY SUPPORT INFORMATION

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

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BOEING SERVICE BULLETIN 747-21-2544
MANPOWER

Airplanes Total Task Hours Elapsed Hours

Group 1 0.75 0.75

Group 2 0.75 0.75

Group 3 0.75 0.75

MATERIAL INFORMATION

Boeing Supplied Parts.

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

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Export Controlled ECCN: 9E991 - BOEING

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BOEING SERVICE BULLETIN 747-21-2544
Commercial 

Airplanes 747

Service Bulletin

SPECIAL ATTENTION

Number: 747-21-2544

Original Issue: January 15, 2013

Revision 1: September 30, 2013

ATA System: 2144

SUBJECT: AIR CONDITIONING - Aft Cargo Compartment Heating System - Marker and Tape

Installation

BOEING RECOMMENDS THAT EACH OPERATOR EXAMINE THIS SERVICE BULLETIN IMMEDIATELY.

1. PLANNING INFORMATION

A. Effectivity

1. Airplanes

Refer to Service Bulletin Index D6-30300 Part 3 for Airplane Variable Number, Line Number, and

Serial Number data.

This service bulletin is for the airplane(s) shown below. An equivalent change is on subsequent

production airplanes. Refer to PRR 85901-121S for data about this change.

GROUP CONFIGURATION DESCRIPTION

747-400, 747-400D, 747-400F and 747-8F Airplanes with Zone

Temperature Sensors on the left wall of the bulk cargo compartment.

1 -

747-8 Passenger Airplanes with Zone Temperature Sensors on the

right wall of the bulk cargo compartment.

2 -

747-400 and 747-400F Airplanes with Zone Temperature Sensors

on the ceiling of the bulk cargo compartment.

3 -

Airplane Models:

747-400, 747-400D, 747-400F, 747-8, 747-8F

Variable Number Group

RC002 - RC006 2

RC022 - RC025 2

RC502 - RC506 1

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Variable Number Group

RC523 1

RC541 1

RC546 1

RC551 - RC552 1

RC555 - RC560 1

RC574 - RC579 1

RC601 - RC603 1

RL401 - RL403 1

RL411 - RL436 1

RL451 - RL456 1

RL461 - RL462 1

RL471 - RL481 1

RL491 - RL492 1

RL501 - RL502 1

RL511 - RL516 1

RL521 - RL522 1

RL531 - RL534 1

RL551 1

RL561 1

RL563 - RL568 1

RL571 - RL572 1

RL576 - RL577 1

RL579 1

RL581 - RL586 1

RL651 - RL655 1

RL671 - RL675 1

RL681 - RL684 1

RL751 - RL752 1

RM001 - RM007 1

RM010 - RM013 1

RM021 - RM024 1

RM026 - RM030 1

RM036 - RM040 1

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BOEING SERVICE BULLETIN 747-21-2544
Variable Number Group

RM071 1

RM091 1

RM116 - RM117 1

RM126 - RM132 1

RM146 - RM147 1

RM156 - RM158 1

RM166 - RM177 1

RM231 - RM233 1

RM241 - RM246 1

RM316 - RM318 1

RM341 1

RM351 - RM355 1

RM366 - RM367 1

RM401 - RM403 1

RM426 1

RM431 1

RM441 - RM443 1

RM445 1

RM801 - RM803 3

RM811 - RM813 3

RM851 - RM859 1

RM861 - RM862 1

RM871 - RM899 1

RM901 - RM906 1

RM911 3

RR701 1

RR721 - RR724 1

RR746 - RR748 1

RR851 - RR856 1

RR861 - RR862 1

RR951 - RR952 1

RT001 - RT009 1

RT010 - RT014 3

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BOEING SERVICE BULLETIN 747-21-2544
Variable Number Group

RT021 - RT022 1

RT031 - RT033 1

RT034 - RT035 3

RT041 - RT043 1

RT045 - RT047 1

RT061 1

RT071 - RT075 1

RT101 - RT103 1

RT131 - RT133 1

RT134 - RT137 3

RT161 - RT168 3

RT401 - RT412 1

RT433 - RT447 1

RT456 1

RT501 - RT510 1

RT513 1

RT516 1

RT518 - RT520 1

RT524 1

RT526 1

RT528 1

RT530 - RT535 1

RT571 - RT588 1

RT590 1

RT601 - RT614 1

RT616 - RT630 1

RT633 - RT634 1

RT636 - RT657 1

RT681 - RT682 1

RT691 - RT699 1

RT701 - RT704 1

RT714 - RT717 1

RT744 - RT757 1

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BOEING SERVICE BULLETIN 747-21-2544
Variable Number Group

RT776 - RT777 1

RT781 - RT784 1

RT801 - RT803 1

RT811 - RT814 1

RT837 1

RT861 - RT864 1

RT877 - RT880 1

RT951 - RT955 1

RT966 - RT967 1

RU002 - RU006 1

RU016 - RU017 1

RU031 - RU032 1

RU061 - RU062 1

RU081 - RU083 1

RU101 - RU102 1

RU803 1

RU805 1

RU808 - RU809 1

RU831 1

RU833 - RU834 1

RU836 - RU837 1

RU840 - RU841 1

2. Spares Affected

None.

B. Concurrent Requirements

None.

C. Reason

This service bulletin provides visual warning and information for cargo handlers to make sure that cargo

does not block the Zone Temperature Sensor (ZTS) in the bulk cargo compartment. Keeping the bulk

cargo compartment ZTS clear of cargo will prevent excessive temperatures in the aft lower lobe cargo

compartment. If this service bulletin is not done, the aft lower lobe cargo compartment could overheat

and if present, temperature sensitive cargo may release flammable vapors which could result in a fire

or explosion if exposed to an ignition source.

Export Controlled ECCN: 9E991 - BOEING

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BOEING SERVICE BULLETIN 747-21-2544
One operator has reported very high temperatures, up to 67 Degrees Celsius near the floor in the aft

lower lobe cargo compartment. This occurred when the Aft Cargo Air Conditioning (ACAC) was selected

OFF and Aft Cargo Heat was selected ON. The operator also noted that loose cargo blocked the cover

plate for the Bulk Cargo Zone Temperature Sensor (ZTS).

The Aft Cargo Heat system is controlled by three temperature switches (two control switches and one

overheat switch) located in the Bulk ZTS Assembly. When the air inlet to this assembly becomes

blocked by loaded or shifted cargo, the temperature switches fail to receive an adequate sample of

compartment air. Under these conditions, the switches will not command the system valves properly.

Since the temperature inside the ZTS Assembly will be influenced by the cold cheek temperatures, the

result is that the switches may fail to shut off the flow of hot air to the lower lobe cargo compartment,

causing compartment temperatures to rise beyond 60 degrees C. Temperature sensitive cargo must

be packaged to prevent exposure to high temperatures only if the contents begin to give off flammable

vapors below 60 Degrees Celsius. Flammable vapors can be released into the aft lower lobe cargo

compartment if temperature sensitive cargo is present that releases flammable vapors above 60 Degrees

Celsius.

This service bulletin installs black and yellow striped tape and a marker that provides information for

cargo handlers. By adding an additional marker and tape this will provide a warning that cargo must

be placed away from the ZTS in the bulk cargo compartment so that temperature readings are not

adversely affected.

Boeing Service Related Problem (SRP) 747-SRP-21-0194 is related to this service bulletin.

Boeing Fleet Team Digest (FTD) 747 FTD 21-12008 is related to this service bulletin.

Revision 01 is sent to update the airplane effectivity by adding and removing airplanes. Airplanes were

added to the effectivity that are affected by the aft cargo overheat issue and should have this marker

and tape installed. The airplanes that were removed have dual cargo heat installed and are not affected

by the aft cargo overheat issue.

D. Description

Remove existing marker. Install tape. Install markers.

Revision 01 - No more work is necessary on airplanes changed in accordance with the original issue

of this service bulletin.

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

Group 1:

Affected Maintenance Zones

Model Zone

747-400, 747-400D, 747-400F, 145, 146

747-8F

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BOEING SERVICE BULLETIN 747-21-2544
Group 2:

Affected Maintenance Zones

Model Zone

747-8 145, 146

Group 3:

Affected Maintenance Zones

Model Zone

747-400, 747-400F 145, 146

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 change given in this service bulletin be done within 12 months after the

Revision 01 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.

G. Manpower

The table below shows an estimate of the task hours necessary to do this change 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.

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BOEING SERVICE BULLETIN 747-21-2544
Group 1:

Task Number of Persons Task Hours Elapsed Hours

Open Access 1 0.25 0.25

FIGURE 1 1 0.25 0.25

Close Access 1 0.25 0.25

TOTAL FOR EACH AIRPLANE 0.75 0.75

Group 2:

Task Number of Persons Task Hours Elapsed Hours

Open Access 1 0.25 0.25

FIGURE 2 1 0.25 0.25

Close Access 1 0.25 0.25

TOTAL FOR EACH AIRPLANE 0.75 0.75

Group 3:

Task Number of Persons Task Hours Elapsed Hours

Open Access 1 0.25 0.25

FIGURE 3 1 0.25 0.25

Close Access 1 0.25 0.25

TOTAL FOR EACH AIRPLANE 0.75 0.75

H. Weight and Balance Changes

None.

I. Electrical Load Data

Not changed.

J. References

1. Existing Data:

a. Engineering Change Memo PRR 85901-121S

b. Boeing Service Related Problem (SRP) 747-SRP-21-0194

c. Service Bulletin Index D6-30300

d. 747 Fleet Team Digest (FTD) 21-12008

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BOEING SERVICE BULLETIN 747-21-2544
2. Data Supplied with this Service Bulletin:

None.

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

Drawing Number Title

215U2001 Sensor Installation - Temperature Control, Bulk Cargo Compartment

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:

Publication Chapter-Section

747 Aircraft Maintenance Manual 21-44, 21-61

747 Illustrated Parts Catalog 21-43

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.

M. Software Accomplishment Summary

Not affected.

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BLANK PAGE
2. MATERIAL INFORMATION

A. Material - Price and Availability

Boeing can supply the parts shown in Paragraph 2.C., Parts Necessary for Each Airplane. Operators

are encouraged to share schedule requirements with Boeing for incorporation of the service bulletin.

The parts are subject to the terms and conditions of the Boeing standard purchase order

acknowledgment. Prices are in United States Dollars. Terms: Net 30 days.

Reference this service bulletin and submit your purchase order by one of these methods:

1. Order on-line via ATA Spec 2000 or The Boeing PART Page

2. Fax to (206) 662-7145

REFER TO THE BOEING PART PAGE ON MYBOEINGFLEET.COM OR CONTACT FIRST RESPONDER

AT FR@BOEING.COM FOR THE LATEST REORDER LEAD TIME (ROLT) AND PRICE INFORMATION

Unit Price as of

the original issue

date of this Service Bulletin (US

Dollars)

ROLT as of the

original issue

date of this Service Bulletin (Calendar Days)

Part Number Name Date QTY

215U2400-1 MARKER 12/17/12 75 47 13.00

215U2400-1 MARKER 01/29/13 216

215U2400-2 MARKER 02/14/13 5 54 8.00

BAC27EAC0158 MARKER (a) 01/29/13 106 47 8.00

BAC27EAC0199 MARKER (a) 01/29/13 80 47 33.33

BAC27EAC0206 MARKER (a) 01/29/13 37 47 8.00

BAC27EAC535 MARKER (a) 01/29/13 38 54 8.00

BAC27EAC536 MARKER (a) 01/29/13 12 54 8.00

BAC27EAC820 MARKER (a) 02/08/13 12 54 8.00

(a) Refer to Appendix A for marker effectivity.

B. Industry Support Information

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

C. Parts Necessary for Each Airplane

1. Kits/Parts

To get the kits/parts shown below, refer to Paragraph 2.A., Material - Price and Availability.

NOTE: The parts below and the items shown in Paragraph 2.C.2., Parts and Materials Supplied

by the Operator, are necessary for each airplane.

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Parts

Existing Part Notes

Number

New Part Number QTY Name

Figure 1 Figure 2 Figure 3

215U2001-100 1 1 1 TAPE - (a)

215U2400-1 1 1 1 MARKER - (a)

BAC27EAC0158 1 - 1 MARKER BAC27EAC0158 (a) (b)

BAC27EAC0199 1 - 1 MARKER BAC27EAC0199 (a) (b)

BAC27EAC0206 1 - 1 MARKER BAC27EAC0206 (a) (b)

BAC27EAC535 1 - 1 MARKER BAC27EAC535 (a) (b)

BAC27EAC536 1 - 1 MARKER BAC27EAC536 (a) (b)

BAC27EAC820 1 - - MARKER BAC27EAC820 (a) (b)

215U2400-2 - 1 - MARKER - (a)

(a) This part is used in production.

(b) Refer to Appendix A for marker effectivity.

2. Parts and Materials Supplied by the Operator

The following parts or materials are necessary to do the change in this service bulletin. Parts and

materials in the manuals given in Paragraph 1.J., References, can also be necessary. Examine

operator part and material supply to make sure all necessary parts and materials are available.

Part Number / QTY Name Notes

Specification

1 roll Tape (a) (b)

(2"

wide)

215U2001-100 (3M

#5702)

(a) 3M #5702 is manufactured by 3M, 3M Center, St. Paul, MN 55144-1000 or their website

is www.shop3m.com.

(b) Boeing also stocks this material and you may order the tape from Boeing.

3. Parts Modified and Reidentified

None.

4. Parts Removed and Not Replaced

None.

D. Parts Necessary to Change Spares

None.

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BOEING SERVICE BULLETIN 747-21-2544
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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BLANK PAGE
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

– Tolerance on linear dimensions, other than rivet and bolt edge margins, is plus

or minus 0.03 inch

4. 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.

5. 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.

B. WORK INSTRUCTIONS

Group 1:

1. Remove existing marker and install tape and new markers in accordance with FIGURE 1.

2. Put the airplane back to a serviceable condition.

Group 2:

1. Remove existing marker and install tape and new markers in accordance with FIGURE 2.

2. Put the airplane back to a serviceable condition.

Group 3:

1. Remove existing marker and install tape and new markers in accordance with FIGURE 3.

2. Put the airplane back to a serviceable condition.

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This Figure applies only to: Group 1.

FIGURE 1: INSTALLATION OF TAPE AND MARKERS

(SHEET 1 OF 4)

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FIGURE 1: INSTALLATION OF TAPE AND MARKERS

(SHEET 2 OF 4)

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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 each airplane.

Step Task Name Identification Qty More Data

1 Remove MARKER - 1

FIGURE 1: INSTALLATION OF TAPE AND MARKERS

(SHEET 3 OF 4)

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Step Task Name Identification Qty More Data

2 Install (New) TAPE 215U2001-100 -

3 Install (New) MARKER 215U2400-1 1

Reference APPENDIX A for which

marker part number

is effective for your

aircraft.

4 Install (New) MARKER - 1

FIGURE 1: INSTALLATION OF TAPE AND MARKERS

(SHEET 4 OF 4)

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This Figure applies only to: Group 2.

FIGURE 2: INSTALLATION OF TAPE AND MARKERS

(SHEET 1 OF 4)

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FIGURE 2: INSTALLATION OF TAPE AND MARKERS

(SHEET 2 OF 4)

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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 each airplane.

Step Task Name Identification Qty More Data

1 Remove MARKER - 1

FIGURE 2: INSTALLATION OF TAPE AND MARKERS

(SHEET 3 OF 4)

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Step Task Name Identification Qty More Data

2 Install (New) TAPE 215U2001-100 -

3 Install (New) MARKER 215U2400-1 1

4 Install (New) MARKER 215U2400-2 1

FIGURE 2: INSTALLATION OF TAPE AND MARKERS

(SHEET 4 OF 4)

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This Figure applies only to: Group 3.

FIGURE 3: INSTALLATION OF TAPE AND MARKERS

(SHEET 1 OF 4)

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FIGURE 3: INSTALLATION OF TAPE AND MARKERS

(SHEET 2 OF 4)

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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 each airplane.

Step Task Name Identification Qty More Data

1 Remove MARKER - 1

FIGURE 3: INSTALLATION OF TAPE AND MARKERS

(SHEET 3 OF 4)

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Step Task Name Identification Qty More Data

2 Install (New) TAPE 215U2001-100 -

3 Install (New) MARKER 215U2400-1 1

Reference APPENDIX A for which

marker part number

is effective for your

aircraft.

4 Install (New) MARKER - 1

FIGURE 3: INSTALLATION OF TAPE AND MARKERS

(SHEET 4 OF 4)

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BOEING SERVICE BULLETIN 747-21-2544
Airplane Marker Number

RM011-RM012, RM021-RM024, RM026-RM027, BAC27EAC0158

RM036-RM038, RM071, RM091, RM116-RM117,

RM126-RM129, RM166-RM176, RM231-RM232,

RM241, RM316, RT001-RT014, RT061, RT101-RT103,

RT131-RT137, RT161-RT168, RT401-RT412, RT531-

RT535, RT571-RT590, RT601-RT614, RT616-RT630,

RT633-RT634, RT636-RT657, RT681-RT682, RT691-

RT699, RT744-RT757, RT776-RT777, RT801-RT803,

RT811-RT814, RT861-RT864, RT951-RT955, RT966-

RT967, RU002-RU006, RU016-RU017, RU031-RU032,

RU061-RU062, RU081-RU083, RU803, RU805,

RU808-RU809, RU831, RU833-RU837, RU840-RU841

RF001-RF004, RM041-RM045, RM051-RM052, BAC27EAC0199

RM081-RM084, RM096-RM097, RM136-RM145,

RM191-RM192, RM261-RM264, RM331-RM333,

RT021-RT022, RT121, RT151-RT152, RT452-RT460,

RT462-RT469, RT471-RT499, RT501-RT530, RT551-

RT567, RT831-RT835, RT837, RT931-RT932, RT945-

RT949, RU051-RU052, RU059-RU060, RU121-RU132

RM001-RM002, RM146-RM147, RM156-RM157, BAC27EAC0206

RM811-RM812, RM851, RM911, RR701, RR721-

RR724, RR746-RR748, RR851-RR856, RR861-RR862,

RR951-RR952, RT031-RT035, RT041-RT047, RT071-

RT075, RT433-RT447, RT701-RT704, RT714-RT717,

RT781-RT784, RT877-RT880, RU101-RU102

RL401-RL403, RL411-RL436, RL451-RL456, RL461- BAC27EAC535

RL462, RL471-RL481, RL491-RL492, RL501-RL502,

RL511-RL516, RL521-RL522, RL531-RL534, RL551,

RL561, RL563-RL568, RL571-RL572, RL576-RL577,

RL579, RL581-RL586, RL651-RL655, RL671-RL675,

RL681-RL684, RL751-RL752, RM003-RM007, RM010,

RM158, RM341, RM401-RM403, RM426, RM813,

RM852-RM859, RM861-RM862, RM871-RM899,

RM901-RM906

RM013, RM028-RM030, RM039-RM040, RM130- BAC27EAC536

RM132, RM177, RM233, RM242-RM246, RM317-

RM318, RM351-RM355, RM366-RM367, RM431,

RM441-RM443, RM445, RM801-RM803

RC502-RC506, RC523, RC541, RC546, RC551- BAC27EAC820

RC552, RC555-RC560, RC574-RC579, RC601-RC603

APPENDIX A: MARKER EFFECTIVITY TABLE

(SHEET 1 OF 1)

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