### 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. 9E991 ECCN: 

## 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 Unpublished Work.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.

Original Issue: January 15, 2013 747-21-2544 Revision 1: September 30, 2013 1 of 38 2.0Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1: September 30, 2013 2 of 38 **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 PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1: September 30, 2013 3 of 38 **BOEING SERVICE BULLETIN 747-21-2544**Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1: September 30, 2013 4 of 38 **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

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1: September 30, 2013 5 of 38Vertical 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** January 15, 2013 Original Issue: September 30, 2013 Revision 1:

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1: September 30, 2013 6 of 38 **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 PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1: September 30, 2013 7 of 38Boeing 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.
**Reference Affected**  **Planning Data** Paragraph 1.A.2., Spares Affected No Spares Affected Paragraph 1.E., Compliance and Paragraph 1.F., Approval Yes AD Related Paragraph 1.H., Weight and Balance Changes No Weight and Balance Change Paragraph 1.I., Electrical Load Data No Electrical Load Changed Paragraph 1.K., Publications Affected Yes Publications Affected Paragraph 1.K., Publications Affected No Airplane Flight Operations Affected (Flight CrewOperations Manual and/or FAA Approved Airplane Flight Manual) Paragraph 2.C.1., Kits/Parts Yes Kits/Parts Required Paragraph 2.C.2., Parts and Materials Supplied by the Operator Yes Operator Supplied Parts/Material Paragraph 2.F., Special Tooling Necessary to do this Service Bulletin No Special Tooling Required
**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.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1: September 30, 2013 8 of 38 **BOEING SERVICE BULLETIN 747-21-2544 MANPOWER**  **Elapsed Hours Total Task Hours**  **Airplanes** 0.75 0.75 Group 1 0.75 0.75 Group 2 0.75 0.75 Group 3
**MATERIAL INFORMATION** Boeing Supplied Parts. Refer to Paragraph 2.A., Material - Price and Availability.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1: September 30, 2013 9 of 38 **BOEING SERVICE BULLETIN 747-21-2544**Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1: September 30, 2013 10 of 38 **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.
**DESCRIPTION CONFIGURATION**  **GROUP** 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 **Group Variable Number**  2 RC002 - RC006 2 RC022 - RC025 1 RC502 - RC506

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1: September 30, 2013 11 of 38**Group Variable Number**  1 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

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1: September 30, 2013 12 of 38 **BOEING SERVICE BULLETIN 747-21-2544 Group**  **Variable Number** 1 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 3 RM801 - RM803 3 RM811 - RM813 1 RM851 - RM859 1 RM861 - RM862 1 RM871 - RM899 1 RM901 - RM906 3 RM911 1 RR701 1 RR721 - RR724 1 RR746 - RR748 1 RR851 - RR856 1 RR861 - RR862 1 RR951 - RR952 1 RT001 - RT009 3 RT010 - RT014

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1: September 30, 2013 13 of 38 **BOEING SERVICE BULLETIN 747-21-2544 Group**  **Variable Number** 1 RT021 - RT022 1 RT031 - RT033 3 RT034 - RT035 1 RT041 - RT043 1 RT045 - RT047 1 RT061 1 RT071 - RT075 1 RT101 - RT103 1 RT131 - RT133 3 RT134 - RT137 3 RT161 - RT168 1 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

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1: September 30, 2013 14 of 38 **BOEING SERVICE BULLETIN 747-21-2544 Group**  **Variable Number** 1 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 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 PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1: September 30, 2013 15 of 38 **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 Zone**  **Model** 145, 146 747-400, 747-400D, 747-400F, 747-8F

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1: September 30, 2013 16 of 38 **BOEING SERVICE BULLETIN 747-21-2544 Group 2:** 
**Affected Maintenance Zones Zone**  **Model** 145, 146 747-8 **Group 3:**
**Affected Maintenance Zones Zone**  **Model** 145, 146 747-400, 747-400F **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.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1: September 30, 2013 17 of 38 **BOEING SERVICE BULLETIN 747-21-2544 Group 1:**  **Elapsed Hours Task Hours**  **Number of Persons Task**  0.25 0.25 1 Open Access 0.25 0.25 1 FIGURE 1 0.25 0.25 1 Close Access 0.75 0.75 TOTAL FOR EACH AIRPLANE **Group 2: Elapsed Hours**  **Task Hours Number of Persons**  **Task** 0.25 0.25 1 Open Access 0.25 0.25 1 FIGURE 2 0.25 0.25 1 Close Access 0.75 0.75 TOTAL FOR EACH AIRPLANE **Group 3: Elapsed Hours**  **Task Hours Number of Persons**  **Task** 0.25 0.25 1 Open Access 0.25 0.25 1 FIGURE 3 0.25 0.25 1 Close Access 0.75 0.75 TOTAL FOR EACH AIRPLANE **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

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1: September 30, 2013 18 of 38 **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:
**Title Drawing Number**  Sensor Installation - Temperature Control, Bulk Cargo Compartment 215U2001 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: **Chapter-Section Publication**  21-44, 21-61 747 Aircraft Maintenance Manual 21-43 747 Illustrated Parts Catalog 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.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1: September 30, 2013 19 of 38 **BOEING SERVICE BULLETIN 747-21-2544**Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1: September 30, 2013 20 of 38 **BOEING SERVICE BULLETIN 747-21-2544**

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 Ser vice Bulletin (US**  **Dollars) ROLT as of the**  **original issue date of this Ser** **vice Bulletin (Cal endar Days)**  **QTY Date**  **Name Part Number** 

13.00 47 75 12/17/12 MARKER 215U2400-1 216 01/29/13 MARKER 215U2400-1 8.00 54 5 02/14/13 MARKER 215U2400-2 8.00 47 106 01/29/13 MARKER (a) BAC27EAC0158 33.33 47 80 01/29/13 MARKER (a) BAC27EAC0199 8.00 47 37 01/29/13 MARKER (a) BAC27EAC0206 8.00 54 38 01/29/13 MARKER (a) BAC27EAC535 8.00 54 12 01/29/13 MARKER (a) BAC27EAC536 8.00 54 12 02/08/13 MARKER (a) BAC27EAC820 (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.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1: September 30, 2013 21 of 38 **BOEING SERVICE BULLETIN 747-21-2544 Parts**  **Notes Existing Part**  **Number Name**  **QTY New Part Number**  **Figure 3 Figure 2**  **Figure 1** (a)

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

- MARKER 1 1 1 215U2400-1 (a) (b) BAC27EAC0158 MARKER 1
- 1 BAC27EAC0158 (a) (b) BAC27EAC0199 MARKER 1
- 1 BAC27EAC0199 (a) (b) BAC27EAC0206 MARKER 1
- 1 BAC27EAC0206 (a) (b) BAC27EAC535 MARKER 1
- 1 BAC27EAC535 (a) (b) BAC27EAC536 MARKER 1
- 1 BAC27EAC536 (a) (b) BAC27EAC820 MARKER

- - 1 BAC27EAC820 (a)

- MARKER

- 1
- 215U2400-2 (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.
**Notes Name**  **QTY Part Number /**  **Specification** (a) (b) Tape 1 roll

(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.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1: September 30, 2013 22 of 38 **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.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1: September 30, 2013 23 of 38 **BOEING SERVICE BULLETIN 747-21-2544**Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1: September 30, 2013 24 of 38 **BOEING SERVICE BULLETIN 747-21-2544**

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.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1: September 30, 2013 25 of 38 **BOEING SERVICE BULLETIN 747-21-2544 This Figure applies only to: Group 1.** 

**FIGURE 1: INSTALLATION OF TAPE AND MARKERS (SHEET 1 OF 4)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1 September 30, 2013 26 of 38 **BOEING SERVICE BULLETIN 747-21-2544 FIGURE 1: INSTALLATION OF TAPE AND MARKERS**  **(SHEET 2 OF 4)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1 September 30, 2013 27 of 38 **BOEING SERVICE BULLETIN 747-21-2544**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.
**More Data Qty**  **Identification Name**  **Task Step**  1
- MARKER Remove 1

**FIGURE 1: INSTALLATION OF TAPE AND MARKERS (SHEET 3 OF 4)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1 September 30, 2013 28 of 38 **BOEING SERVICE BULLETIN 747-21-2544 More Data**  **Qty Identification**  **Name Task**  **Step**

- 215U2001-100 TAPE Install (New) 2 1 215U2400-1 MARKER Install (New) 3 Reference APPENDIX A for which marker part number is effective for your aircraft. 1
- MARKER Install (New) 4

**FIGURE 1: INSTALLATION OF TAPE AND MARKERS (SHEET 4 OF 4)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1 September 30, 2013 29 of 38 **BOEING SERVICE BULLETIN 747-21-2544 This Figure applies only to: Group 2.** 

**FIGURE 2: INSTALLATION OF TAPE AND MARKERS (SHEET 1 OF 4)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1 September 30, 2013 30 of 38 **BOEING SERVICE BULLETIN 747-21-2544 FIGURE 2: INSTALLATION OF TAPE AND MARKERS**  **(SHEET 2 OF 4)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1 September 30, 2013 31 of 38 **BOEING SERVICE BULLETIN 747-21-2544**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.
**More Data Qty**  **Identification Name**  **Task Step**  1
- MARKER Remove 1

**FIGURE 2: INSTALLATION OF TAPE AND MARKERS (SHEET 3 OF 4)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1 September 30, 2013 32 of 38 **BOEING SERVICE BULLETIN 747-21-2544 More Data**  **Qty Identification**  **Name Task**  **Step**

- 215U2001-100 TAPE Install (New) 2 1 215U2400-1 MARKER Install (New) 3 1 215U2400-2 MARKER Install (New) 4

**FIGURE 2: INSTALLATION OF TAPE AND MARKERS (SHEET 4 OF 4)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1 September 30, 2013 33 of 38 **BOEING SERVICE BULLETIN 747-21-2544 This Figure applies only to: Group 3.** 

**FIGURE 3: INSTALLATION OF TAPE AND MARKERS (SHEET 1 OF 4)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1 September 30, 2013 34 of 38 **BOEING SERVICE BULLETIN 747-21-2544 FIGURE 3: INSTALLATION OF TAPE AND MARKERS**  **(SHEET 2 OF 4)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1 September 30, 2013 35 of 38 **BOEING SERVICE BULLETIN 747-21-2544**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.
**More Data Qty**  **Identification Name**  **Task Step**  1
- MARKER Remove 1

**FIGURE 3: INSTALLATION OF TAPE AND MARKERS (SHEET 3 OF 4)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1 September 30, 2013 36 of 38 **BOEING SERVICE BULLETIN 747-21-2544 More Data**  **Qty Identification**  **Name Task**  **Step**

- 215U2001-100 TAPE Install (New) 2 1 215U2400-1 MARKER Install (New) 3 Reference APPENDIX A for which marker part number is effective for your aircraft. 1
- MARKER Install (New) 4

**FIGURE 3: INSTALLATION OF TAPE AND MARKERS (SHEET 4 OF 4)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1 September 30, 2013 37 of 38 **BOEING SERVICE BULLETIN 747-21-2544 Marker Number**  **Airplane** BAC27EAC0158 RM011-RM012, RM021-RM024, RM026-RM027, 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 BAC27EAC0199 RF001-RF004, RM041-RM045, RM051-RM052, 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 BAC27EAC0206 RM001-RM002, RM146-RM147, RM156-RM157, 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 BAC27EAC535 RL401-RL403, RL411-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, 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 BAC27EAC536 RM013, RM028-RM030, RM039-RM040, RM130- RM132, RM177, RM233, RM242-RM246, RM317- RM318, RM351-RM355, RM366-RM367, RM431, RM441-RM443, RM445, RM801-RM803 BAC27EAC820 RC502-RC506, RC523, RC541, RC546, RC551- RC552, RC555-RC560, RC574-RC579, RC601-RC603

**APPENDIX A: MARKER EFFECTIVITY TABLE (SHEET 1 OF 1)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 15, 2013 747-21-2544 Revision 1 September 30, 2013 38 of 38 **BOEING SERVICE BULLETIN 747-21-2544**