### Commercial **Airplanes** 

# 747 Service Bulletin **SPECIAL ATTENTION Number: 747-52-2286**  Original Issue: September 28, 2007 Revision 1: October 28, 2010 ATA System: 5200 **SUBJECT:** DOORS - Forward, Aft and Nose Cargo Doors - Cargo Door Control Switch - Replacement Export of this technology is controlled under the United States Export Administration Regulations (EAR) (15 CFR 730-774). An export license may be required before it is used for development, production or use by foreign persons from specific countries. The controller of this data has the individual responsibility to abide by all export laws.9E991 ECCN: 

## BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2007 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter. Boeing also claims copyright in this document as a compilation and/or collective work. This document includes proprietary information owned by The Boeing Company and/or one or more third parties. Treatment of the document and the information it contains is governed by contract with Boeing. For more information, contact The Boeing Company, P.O. Box 3707, Seattle, Washington 98124. Boeing, the Boeing signature, the Boeing symbol, 707, 717, 727, 737, 747, 757, 767, 777, 787, Dreamliner, BBJ, DC-8, DC-9, DC-10, KC-10, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8A, Poseidon and the Boeing livery 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BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1: October 28, 2010 1 of 36 2.0BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1: October 28, 2010 2 of 36 **BOEING SERVICE BULLETIN 747-52-2286**

BLANK PAGE**Table of Contents** Revision Transmittal Sheet............................................ 5 Summary...................................................... 7 1. PLANNING INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 A. Effectivity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 1. Airplanes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2. Spares Affected. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 B. Concurrent Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 C. Reason. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 D. Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 E. Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 F. Approval. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 G. Manpower. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 H. Weight and Balance Changes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 I. Electrical Load Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 J. References. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 1. Existing Data:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 2. Data supplied with this Service Bulletin:. . . . . . . . . . . . . . . . . . . . . . . . . . . 24 3. Installation Drawings Used in the Preparation of this Service Bulletin:. . . . . . . . . . . 24 K. Publications Affected. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 L. Interchangeability and Intermixability of Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . 25 2. MATERIAL INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 A. Material - Price and Availability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 B. Industry Support Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 C. Parts Necessary For Each Airplane. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 1. Kits/Parts:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 2. Parts and Materials Supplied by the Operator:. . . . . . . . . . . . . . . . . . . . . . . . 27 3. Parts Modified and Reidentified:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 4. Parts Removed and Not Replaced:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 D. Parts Necessary to Change Spares. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 E. Special Tooling - Price and Availability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 F. Special Tooling Necessary to do this Service Bulletin. . . . . . . . . . . . . . . . . . . . . . . 27 3. ACCOMPLISHMENT INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 A. GENERAL INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 B. WORK INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 FIGURE 1: REPLACE CARGO DOOR CONTROL SWITCH - FORWARD CARGO DOOR. . . . . . 31 FIGURE 2: REPLACE CARGO DOOR CONTROL SWITCH - AFT CARGO DOOR. . . . . . . . . . 33 FIGURE 3: REPLACE CARGO DOOR CONTROL SWITCH - NOSE CARGO DOOR [Group 2-3] . . 35

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1: October 28, 2010 3 of 36 **BOEING SERVICE BULLETIN 747-52-2286**BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1: October 28, 2010 4 of 36 **BOEING SERVICE BULLETIN 747-52-2286**

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### Commercial **Airplanes** 

# 747 Service Bulletin **SPECIAL ATTENTION Revision Transmittal Sheet**  **Number: 747-52-2286** Original Issue: September 28, 2007 Revision 1: October 28, 2010 ATA System: 5200 **SUBJECT:** DOORS - Forward, Aft and Nose Cargo Doors - Cargo Door Control Switch - Replacement This revision includes all pages of the service bulletin. **COMPLIANCE INFORMATION RELATED TO THIS REVISION** No more work is necessary on airplanes changed in accordance with the original issue of this service bulletin. 747-400F Airplanes line number 1382 through 1419 were added to the service bulletin effectivity as new Group 3. Federal Aviation Administration (FAA) Airworthiness Directive AD 2009-22-08 is related to this service bulletin. **REASON FOR REVISION** This revision is sent to add 747-400F airplanes line number 1382 through 1419 as new Group 3. It had previously been planned that scheduled cargo door control switch replacement on these airplanes would be addressed by a revision to the 747-400 Maintenance Planning Document (MPD), Boeing Document D621U400. However, it was later determined that those airplanes would be added to this service bulletin rather than revising the 747-400 MPD. In addition, in Paragraph 1.E., Compliance, the table was changed to add Group 3, and to clarify the compliance time for Group 1 and Group 2. "Within 6 years from the date of issuance of the original certificate of airworthiness or the original export certificate of airworthiness" has been included as an option to "within 24 months after the original issue date on this service bulletin". References to FAA AD 2009-22-08 were added as part of this revision. 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** September 28, 2007 Original Issue: October 28, 2010 Revision 1:

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1: October 28, 2010 5 of 36BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1: October 28, 2010 6 of 36 **BOEING SERVICE BULLETIN 747-52-2286**

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### Commercial **Airplanes** 

# 747 Service Bulletin **SPECIAL ATTENTION Summary**  **Number: 747-52-2286** Original Issue: September 28, 2007 Revision 1: October 28, 2010 ATA System: 5200 **SUBJECT:** DOORS - Forward, Aft and Nose Cargo Doors - Cargo Door Control Switch - Replacement BOEING RECOMMENDS THAT EACH OPERATOR EXAMINE THIS SERVICE BULLETIN IMMEDIATELY. **CONCURRENT REQUIREMENTS** None. **BACKGROUND** Boeing has received 12 reports from 8 operators of problems associated with uncommanded operation of the Forward and Aft Cargo Doors. 10 of these reports came from 757 airplanes. Further testing of the Cargo Door Control Switch found that the switch remained in the CLOSE position after it was released, causing the door to continue moving. The cause of the switch failure (Part Number MS25307-272) is related to the rated switch operation cycle life. The switch is located in the external control panel forward of each lower lobe cargo door and aft of the nose cargo door. The number of flight cycles for these airplanes were between 9,390 and 22,529. On one occasion an employee was killed, trapped between the cargo door and door frame. Failure to replace the Cargo Door Control Switch can result in injuries to persons and damage to the airplane and equipment. The MS25307-272 Cargo Door Control Switch is not installed at the nose cargo door on 747-200C and 747-200F airplanes. This bulletin establishes the replacement interval and gives replacement details for the Forward, Aft and Nose Cargo Door Control Switches. Boeing Service Related Problem (SRP) 747-SRP-52-0084 is related to this service bulletin. **ACTION** Replace the Forward, Aft and Nose Cargo Door Control Switches at the times given in Paragraph 1.E., Compliance. **EFFECTIVITY** All 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SP, 747SR Airplanes. Refer to Paragraph 1.A.1 Airplanes, for the list of affected airplanes.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1: October 28, 2010 7 of 36**COMPLIANCE** Federal Aviation Administration (FAA) Airworthiness Directive AD 2009-22-08 is related to this service bulletin. See Service Bulletin Paragraph 1.E. for compliance information. **INDUSTRY SUPPORT INFORMATION** Boeing warranty remedies are not available for the repair procedures given in this service bulletin. **MANPOWER Elapsed Hours**  **Total Task Hours Airplanes**  3.25 3.25 Group 1 4.25 4.25 Group 2 and Group 3
**MATERIAL INFORMATION** Operator Supplied Parts/Materials. Refer to Paragraph 2.A., Material - Price and Availability.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1: October 28, 2010 8 of 36 **BOEING SERVICE BULLETIN 747-52-2286**BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1: October 28, 2010 9 of 36 **BOEING SERVICE BULLETIN 747-52-2286**BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1: October 28, 2010 10 of 36 **BOEING SERVICE BULLETIN 747-52-2286**

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### Commercial **Airplanes** 

# 747 Service Bulletin **SPECIAL ATTENTION Number: 747-52-2286**  Original Issue: September 28, 2007 Revision 1: October 28, 2010 ATA System: 5200 **SUBJECT:** DOORS - Forward, Aft and Nose Cargo Doors - Cargo Door Control Switch - Replacement BOEING RECOMMENDS THAT EACH OPERATOR EXAMINE THIS SERVICE BULLETIN IMMEDIATELY. **1. PLANNING INFORMATION A. Effectivity**  1. Airplanes Refer to Service Bulletin Index Document D6-30300 Part 3 for Airplane Variable Number, Line Number, and Serial Number data. This service bulletin is for the airplanes shown below.
**DESCRIPTION CONFIGURATION**  **GROUP** 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747SP, 747SR Airplanes, Line number 1 through 1381 - 1

747-400F Airplanes, Line number 968 through 1381

- 2 747-400F Airplanes, Line number 1382 through 1419

- 3

Airplane Models: 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SP, 747SR **Group Variable Number**  1 RA001 - RA034 1 RA101 - RA115 1 RA161 - RA164

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1: October 28, 2010 11 of 36**Group Variable Number**  1 RA201 - RA203 1 RA216 - RA217 1 RA245 - RA246 1 RA251 - RA266 1 RA301 - RA318 1 RA351 - RA360 1 RA369 - RA373 1 RA401 - RA418 1 RA501 - RA502 1 RA521 - RA528 1 RA532 - RA548 1 RA551 - RA552 1 RA559 - RA561 1 RA581 - RA582 1 RA585 1 RA601 - RA602 1 RA631 - RA635 1 RA651 - RA652 1 RA671 - RA677 1 RA701 - RA702 1 RA721 - RA731 1 RA741 - RA745 1 RA749 - RA750 1 RA761 - RA762 1 RA781 - RA784 1 RA901 - RA916 1 RB001 - RB016 1 RB041 - RB044 1 RB071 - RB075 1 RB101 - RB102 1 RB411 - RB413 1 RB421 1 RB601 - RB607

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1: October 28, 2010 12 of 36 **BOEING SERVICE BULLETIN 747-52-2286 Group**  **Variable Number** 1 RB681 - RB697 1 RB711 1 RB721 - RB723 1 RB741 - RB748 1 RD001 - RD004 1 RD021 - RD022 1 RD041 - RD059 1 RD071 - RD072 1 RD081 - RD083 1 RD091 - RD092 1 RD101 - RD104 1 RD121 - RD127 1 RD131 - RD144 1 RD166 - RD167 1 RD171 - RD172 1 RD181 - RD183 1 RD201 - RD204 1 RD221 - RD227 1 RD231 - RD235 1 RD241 - RD243 1 RD251 - RD262 1 RD271 - RD272 1 RD291 - RD292 1 RD301 - RD302 1 RD311 1 RD351 - RD358 1 RD361 - RD366 1 RD381 - RD383 1 RD411 - RD414 1 RD421 - RD426 1 RD431 - RD435 1 RD441 - RD442 1 RD451 - RD456

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1: October 28, 2010 13 of 36 **BOEING SERVICE BULLETIN 747-52-2286 Group**  **Variable Number** 1 RD461 1 RD471 - RD475 1 RD513 - RD519 1 RD531 - RD533 1 RD551 1 RD561 1 RD571 1 RD581 - RD583 1 RD591 - RD593 1 RD601 - RD607 1 RD621 - RD623 1 RD641 - RD649 1 RD651 - RD659 1 RD661 1 RD671 1 RD681 - RD682 1 RD691 - RD692 1 RD701 - RD702 1 RD721 - RD722 1 RD741 - RD742 1 RD751 - RD755 1 RD761 1 RD771 - RD775 1 RD781 - RD783 1 RD791 - RD792 1 RE001 1 RF001 - RF006 1 RG001 - RG009 1 RG091 1 RG095 1 RG101 - RG104 1 RG121 - RG126 1 RG141 - RG142

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1: October 28, 2010 14 of 36 **BOEING SERVICE BULLETIN 747-52-2286 Group**  **Variable Number** 1 RG161 - RG164 1 RG171 - RG174 1 RG191 - RG193 1 RG211 - RG213 1 RG221 - RG222 1 RH101 - RH102 1 RH111 - RH112 1 RH121 - RH122 1 RJ131 - RJ133 1 RJ151 - RJ152 1 RJ301 - RJ303 1 RJ321 - RJ322 1 RJ331 - RJ333 2 RL401 - RL403 2 RL411 - RL436 2 RL451 - RL456 2 RL461 - RL462 2 RL471 - RL473 3 RL474 - RL481 2 RL491 - RL492 2 RL501 - RL502 2 RL511 - RL512 3 RL513 - RL516 2 RL521 3 RL522 2 RL531 3 RL532 - RL534 3 RL551 3 RL561 - RL568 3 RL571 - RL572 3 RL576 - RL577 3 RL579 3 RL581 - RL586

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1: October 28, 2010 15 of 36 **BOEING SERVICE BULLETIN 747-52-2286 Group**  **Variable Number**2 RL651 - RL655 2 RL671 - RL675 2 RL681 - RL683 3 RL684 2 RL751 - RL752 1 RM001 - RM007 1 RM010 - RM013 1 RM021 - RM024 1 RM026 - RM030 1 RM036 - RM045 1 RM051 - RM053 1 RM071 1 RM081 - RM084 1 RM091 1 RM096 - RM097 1 RM116 - RM117 1 RM126 - RM132 1 RM136 - RM147 1 RM156 - RM158 1 RM166 - RM177 1 RM191 - RM192 1 RM231 - RM233 1 RM241 - RM246 1 RM261 - RM264 1 RM316 - RM318 1 RM331 - RM333 1 RM341 1 RM351 - RM355 1 RM366 - RM367 1 RM401 - RM403 1 RM426 1 RM431 1 RM441 - RM443

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1: October 28, 2010 16 of 36 **BOEING SERVICE BULLETIN 747-52-2286 Group**  **Variable Number** 1 RM445 1 RM801 - RM803 1 RM811 - RM813 2 RM851 - RM859 2 RM861 - RM863 2 RM871 - RM889 3 RM890 2 RM891 - RM899 2 RM901 - RM906 2 RM911 1 RR001 - RR005 1 RR021 - RR025 1 RR031 1 RR201 - RR206 1 RR221 - RR226 1 RR261 - RR267 1 RR301 - RR310 1 RR331 - RR332 1 RR336 1 RR341 - RR345 1 RR361 - RR362 1 RR421 - RR422 1 RR431 - RR432 1 RR441 - RR442 1 RR451 1 RR501 - RR504 1 RR521 - RR522 1 RR526 1 RR531 1 RR551 - RR556 1 RR561 1 RR566 2 RR701

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1: October 28, 2010 17 of 36 **BOEING SERVICE BULLETIN 747-52-2286 Group**  **Variable Number**2 RR721 - RR724 2 RR746 - RR748 2 RR851 - RR856 2 RR861 - RR862 2 RR951 - RR952 1 RS001 - RS002 1 RS201 1 RS211 - RS212 1 RS221 - RS222 1 RS231 - RS241 1 RS251 - RS259 1 RS263 1 RS265 - RS268 1 RS271 - RS276 1 RS291 - RS292 1 RS301 - RS306 1 RS311 - RS320 1 RS331 - RS333 1 RS341 - RS342 1 RS699 1 RS701 - RS703 1 RS711 - RS713 1 RS721 - RS722 1 RS731 - RS732 1 RS741 - RS743 1 RS751 - RS752 1 RS761 - RS762 1 RS771 1 RS781 - RS782 1 RS786 1 RT001 - RT014 1 RT021 - RT022 1 RT031 - RT035

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1: October 28, 2010 18 of 36 **BOEING SERVICE BULLETIN 747-52-2286 Group**  **Variable Number** 1 RT041 - RT047 1 RT061 1 RT071 - RT075 1 RT101 - RT103 1 RT121 1 RT131 - RT137 1 RT151 - RT152 1 RT161 - RT168 1 RT401 - RT412 1 RT431 - RT447 1 RT451 - RT469 1 RT471 - RT499 1 RT501 - RT535 1 RT551 - RT568 1 RT571 - RT591 1 RT601 - RT657 1 RT671 - RT673 1 RT681 - RT682 1 RT691 - RT699 1 RT701 - RT704 1 RT711 - RT717 1 RT741 - RT757 1 RT776 - RT777 1 RT781 - RT784 1 RT801 - RT803 1 RT811 - RT814 1 RT831 - RT837 1 RT861 - RT864 1 RT876 - RT880 1 RT931 - RT932 1 RT945 - RT949 1 RT951 - RT955 1 RT966 - RT967

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1: October 28, 2010 19 of 36 **BOEING SERVICE BULLETIN 747-52-2286 Group**  **Variable Number** 1 RU001 - RU006 1 RU016 - RU017 1 RU031 - RU032 1 RU051 - RU052 1 RU059 - RU062 1 RU081 - RU083 1 RU101 - RU102 1 RU121 - RU132 1 RU801 - RU809 1 RU831 - RU841 2. Spares Affected None. **B. Concurrent Requirements** None. **C. Reason** Boeing has received 12 reports from 8 operators of problems associated with uncommanded operation of the Forward and Aft Cargo Doors. 10 of these reports came from 757 airplanes. Further testing of the Cargo Door Control Switch found that the switch remained in the CLOSE position after it was released, causing the door to continue moving. The cause of the switch failure (Part Number MS25307-272) is related to the rated switch operation cycle life. The switch is located in the external control panel forward of each lower lobe cargo door and aft of the nose cargo door. The number of flight cycles for these airplanes were between 9,390 and 22,529. On one occasion an employee was killed, trapped between the cargo door and door frame. Failure to replace the Cargo Door Control Switch can result in injuries to persons and damage to the airplane and equipment. The MS25307-272 Cargo Door Control Switch is not installed at the nose cargo door on 747-200C and 747-200F airplanes. This bulletin establishes the replacement interval and gives replacement details for the Forward, Aft and Nose Cargo Door Control Switches. Revision 1 is sent to add 747-400F airplanes line number 1382 through 1419 as new Group 3. It had previously been planned that scheduled cargo door control switch replacement on these airplanes would be addressed by a revision to the 747-400 Maintenance Planning Document (MPD), Boeing Document D621U400. However, it was later determined that those airplanes would be added to this service bulletin rather than revising the 747-400 MPD. In addition, in Paragraph 1.E., Compliance, the

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1: October 28, 2010 20 of 36 **BOEING SERVICE BULLETIN 747-52-2286**table was changed to add Group 3, and to clarify the compliance time for Group 1 and Group 2. "Within 6 years from the date of issuance of the original certificate of airworthiness or the original export certificate of airworthiness" has been included as an option to "within 24 months after the original issue date on this service bulletin". References to FAA AD 2009-22-08 were also added as part of Revision 1. Boeing Service Related Problem (SRP) 747-SRP-52-0084 is related to this service bulletin. **D. Description** Replace the Forward, Aft and Nose Cargo Door Control Switches at the times given in Paragraph 1.E., Compliance. 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** 122, 142 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747SP, 747SR **Group 2-3:**
**Affected Maintenance Zones Zone**  **Model** 122, 142, 211 747-400F **E. Compliance** Federal Aviation Administration (FAA) Airworthiness Directive AD 2009-22-08 is related to this service bulletin.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1: October 28, 2010 21 of 36 **BOEING SERVICE BULLETIN 747-52-2286 Table 1: Cargo Door Control Switch Replacement**  **Repeat Interval (Not to Exceed)**  **Compliance Time (Whichever Occurs Later)**  **Action Condition**  6 years Within 6 years from the date of issuance of theoriginal certificate of airworthiness or the original export certificate of airworthiness. Within 24 months after the original issuedate on this service bulletin. Replace the Control Switch in the external control panels for the Forward and Aft Cargo Doors in accordance withParagraph 3.B., Work Instructions, Part 1. Group 1 Airplanes

6 years Within 6 years from the date of issuance of theoriginal certificate of airworthiness or the original export certificate of airworthiness. Within 24 months after the original issuedate on this service bulletin. Replace the Control Switch in the external control panels for the Forward and Aft Cargo Doors and for the NoseCargo Door in accordance with Paragraph 3.B., Work Instructions, Part 2. Group 2 Airplanes

6 years Within 6 years from the date of is- suance of the original certificateof airworthiness or the original export certificate of airworthiness. Replace the Control Switch in the external control panels for the Forward and Aft Cargo Doors and for the NoseCargo Door in accordance with Paragraph 3.B., Work Instructions, Part 2. Group 3 Airplanes

**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. The Manager of the FAA Seattle Aircraft Certification Office (ACO) approves the modification defined in this service bulletin with the corresponding compliance times specified in Table 1 under Paragraph 1.E., Compliance of Service Bulletin 747-52-2286 Revision 1 as an AMOC to the corresponding requirements of paragraphs (c), (f) and (h) of AD 2009-22-08. All provisions of AD 2009-22-08 that are not specifically referenced in this paragraph remain fully applicable and must be complied with.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1: October 28, 2010 22 of 36 **BOEING SERVICE BULLETIN 747-52-2286 G. Manpower**  The table below shows an estimate of the task hours necessary to do this replacement 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: Table 1** **- Replacement of the Forward and Aft Cargo Door Control Switches Elapsed Hours**  **Task Hours Number of Per-**  **sons Task** 
0.50 0.50 1 Open Access Replace Cargo Door Control Switch 1.00 1.00 1 Figure 1 1.00 1.00 1 Figure 2 0.50 0.50 1 Close Access 0.25 0.25 1 Test Cargo Doors 3.25 3.25 TOTAL FOR EACH AIRPLANE **Group 2-3: Table 2** **- Replacement of the Forward, Aft and Nose Cargo Door Control Switches Elapsed Hours**  **Task Hours Number of Per-**  **sons Task** 
0.50 0.50 1 Open Access Replace Cargo Door Control Switch 1.00 1.00 1 Figure 1 1.00 1.00 1 Figure 2 1.00 1.00 1 Figure 3 0.50 0.50 1 Close Access 0.25 0.25 1 Test Cargo Doors 4.25 4.25 TOTAL FOR EACH AIRPLANE

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1: October 28, 2010 23 of 36 **BOEING SERVICE BULLETIN 747-52-2286 H. Weight and Balance Changes**  None. **I. Electrical Load Data** Not changed. **J. References** 1. Existing Data: a. Service Related Problem (SRP) 747-SRP-52-0084 b. 747-400 Aircraft Maintenance Manual (AMM) 52-31-00, 52-31-17, 52-34, 52-34-00, 52-34-10 c. 747-100/200/300 Aircraft Maintenance Manual (AMM) 52-34, 52-34-00, 52-34-10 d. 747-100/200/300 Baggage and Cargo Loading Manual (BCLM) 25-53, 25-57 e. 747-400 Baggage and Cargo Loading Manual (BCLM) 25-53, 25-57 f. Standard Wiring Practices Manual (SWPM) 20-10-11, 20-10-12, 20-30-00 g. Federal Aviation Administration (FAA) Airworthiness Directive 2009-22-08 2. Data supplied with this Service Bulletin: None. 3. Installation Drawings Used in the Preparation of this Service Bulletin:
**Title Drawing Number**  Switch Instl- Cargo Door Control & Lights 65B41786 Electrical Installation - Forward Cargo Door, Wire and Equipment 65B07320 Electrical Installation - Aft Cargo Door, Wire and Equipment 65B07323 Nose Door and Light Control Assembly 284U1590 These drawings were used to prepare this service bulletin. These drawings are not necessary to make the specified changes, and are not supplied with this service bulletin. These drawings may not be applicable to all airplane configurations or operators. **K. Publications Affected** 1. Publications: **Chapter-Section Publication**  747-100/200/300 AMM 52-34, 747-400 AMM 52-34, 747-400 AMM 52-31-00 747 Maintenance Manual

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1: October 28, 2010 24 of 36 **BOEING SERVICE BULLETIN 747-52-2286 Chapter-Section**  **Publication** 747-100/200/300 BCLM 25-53, 747- 100/200/300 BCLM 25-57, 747-400 BCLM 25-53, 747-400 BCLM 25-57 747 Baggage/Cargo Loading Manual

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.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1: October 28, 2010 25 of 36 **BOEING SERVICE BULLETIN 747-52-2286**BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1: October 28, 2010 26 of 36 **BOEING SERVICE BULLETIN 747-52-2286**

BLANK PAGE**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 not available for the repair procedures given in this service bulletin. **C. Parts Necessary For Each Airplane** 1. Kits/Parts: None. 2. Parts and Materials Supplied by the Operator:
**Notes Name**  **QTY Part Number /**  **Specification** Cargo door control switch. Group 1 airplanes only require 2 Toggle Switches. Toggle Switch 3 MS25307-272

BMS5-45 Class A is an acceptable alternate sealant. Sealant

- BMS5-37

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.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1: October 28, 2010 27 of 36 **BOEING SERVICE BULLETIN 747-52-2286**BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1: October 28, 2010 28 of 36 **BOEING SERVICE BULLETIN 747-52-2286**

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. These work instructions refer to procedures included on other Boeing documents. When the words "refer to" are used and the operator has an accepted alternative procedure, the accepted alternative procedure can be used. When the words "in accordance with" are included in the instruction, the procedure in the Boeing document must be used. 4. Refer to the Boeing Standard Wiring Practices Manuals SWPM 20-10-11and SWPM 20-10-12 for the wire installation procedures. **B. WORK INSTRUCTIONS Group 1:**  **PART 1 - FORWARD AND AFT CARGO DOOR CONTROL SWITCH REPLACEMENT** 1. Get access to the applicable access panel, 122AR for the forward cargo door control switch and 142AR for the aft cargo door control switch. 2. Replace Cargo Door Control Switch for the forward cargo door in accordance with FIGURE 1. 3. Replace Cargo Door Control Switch for the aft cargo door in accordance with FIGURE 2. 4. Test the forward and aft cargo doors. Position cargo door control switch to OPEN then to CLOSE and check that door operates. Refer to 747-100/200/300 AMM 52-34-00 and 747-400 AMM 52-34-00 as accepted procedures. 5. Put the airplane back to a serviceable condition. **Group 2-3: PART 2 - FORWARD, AFT AND NOSE CARGO DOOR CONTROL SWITCH REPLACEMENT**  1. Get access to the applicable access panel, 122AR for the forward cargo door control switch, 142AR for the aft cargo door control switch and H121 for the nose cargo door control switch. 2. Replace Cargo Door Control Switch for the forward cargo door in accordance with FIGURE 1. 3. Replace Cargo Door Control Switch for the aft cargo door in accordance with FIGURE 2.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1: October 28, 2010 29 of 36 **BOEING SERVICE BULLETIN 747-52-2286**4. Replace Cargo Door Control Switch for the nose cargo door in accordance with FIGURE 3. 5. Test the forward, aft and nose cargo doors. Position cargo door control switch to OPEN then to CLOSE and check that door operates. Refer to 747-100/200/300 AMM 52-34-00, 747-400 AMM 52-34-00 and 747-400 AMM 52-31-00 as accepted procedures. 6. Put the airplane back to a serviceable condition.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1: October 28, 2010 30 of 36 **BOEING SERVICE BULLETIN 747-52-2286**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.

**FIGURE 1: REPLACE CARGO DOOR CONTROL SWITCH - FORWARD CARGO DOOR (SHEET 1 OF 2)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1 October 28, 2010 31 of 36 **BOEING SERVICE BULLETIN 747-52-2286 MORE DATA**  **QTY IDENTIFICATION**  **NAME TASK**  **STEP** Refer to 747-100/200/300 AMM 52-34-10 or 747-400 AMM 52-34-107 as an accepted procedure. 1 MS25307-272 Cargo Door Control Switch Remove 1

Refer to 747-100/200/300 AMM 52-34-10 or 747-400 AMM 52-34-10 as an accepted procedure. (a) 1 MS25307-272 Cargo Door Control Switch Install (New) 2

(a) Remove old sealant from wire connectors. Brush coat the switch terminals with BMS5-37 or BMS5-45 Class A sealant after all wires are connected. Refer to SWPM 20-30-00 as an accepted procedure.

**FIGURE 1: REPLACE CARGO DOOR CONTROL SWITCH - FORWARD CARGO DOOR (SHEET 2 OF 2)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1 October 28, 2010 32 of 36 **BOEING SERVICE BULLETIN 747-52-2286**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.

**FIGURE 2: REPLACE CARGO DOOR CONTROL SWITCH - AFT CARGO DOOR (SHEET 1 OF 2)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1 October 28, 2010 33 of 36 **BOEING SERVICE BULLETIN 747-52-2286 MORE DATA**  **QTY IDENTIFICATION**  **NAME TASK**  **STEP** Refer to 747-100/200/300 AMM 52-34-10 or 747-400 AMM 52-34-10 as an accepted procedure. 1 MS25307-272 Cargo Door Control Switch Remove 1

Refer to 747-100/200/300 AMM 52-34-10 or 747-400 AMM 52-34-10 as an accepted procedure. (a) 1 MS25307-272 Cargo Door Control Switch Install (New) 2

(a) Remove old sealant from wire connectors. Brush coat the switch terminals with BMS5-37 or BMS5-45 Class A sealant after all wires are connected. Refer to SWPM 20-30-00 as an accepted procedure.

**FIGURE 2: REPLACE CARGO DOOR CONTROL SWITCH - AFT CARGO DOOR (SHEET 2 OF 2)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1 October 28, 2010 34 of 36 **BOEING SERVICE BULLETIN 747-52-2286 This Figure applies only to: Group 2-3.** 

**FIGURE 3: REPLACE CARGO DOOR CONTROL SWITCH - NOSE CARGO DOOR (SHEET 1 OF 2)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1 October 28, 2010 35 of 36 **BOEING SERVICE BULLETIN 747-52-2286**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.
**MORE DATA QTY**  **IDENTIFICATION NAME**  **TASK STEP**  Refer to 747-400 AMM 52-31- 17 as an accepted procedure. 1 MS25307-272 Cargo Door Control Switch Remove 1
Refer to 747-400 AMM 52-31- 17 as an accepted procedure. (a) 1 MS25307-272 Cargo Door Control Switch Install (New) 2

(a) Remove old sealant from wire connectors. Brush coat the switch terminals with BMS5-37 or BMS5-45 Class A sealant after all wires are connected. Refer to SWPM 20-30-00 as an accepted procedure.

**FIGURE 3: REPLACE CARGO DOOR CONTROL SWITCH - NOSE CARGO DOOR (SHEET 2 OF 2)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 28, 2007 747-52-2286 Revision 1 October 28, 2010 36 of 36 **BOEING SERVICE BULLETIN 747-52-2286**