Boeing Special Attention Service Bulletin 747-27-2422: No revision named, text

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Commercial Airplane Group 747

SPECIAL ATTENTION Service Bulletin Number: 747-27-2422 Date: October 30, 2008 ATA System: 2751 SUBJECT: FLIGHT CONTROLS - Trailing Edge Flap System - Transmission Positions 4 and 5 No-back Brake Replacement

BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2008 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter.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, BBJ, DC-8, DC-9, DC-10, MD-10, MD-11, MD-80, MD-88, MD-90, and the red-white-and-blue 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.

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Table of Contents Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1. PLANNING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 A. Effectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

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

2. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 B. Concurrent Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 C. Reason . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 D. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 E. Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 F. Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 G. Manpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 H. Weight and Balance Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 I. Electrical Load Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 J. References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

1. Existing Data: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

2. Data supplied with this Service Bulletin: . . . . . . . . . . . . . . . . . . . . . . . . . 27

3. Installation Drawings Used in the Preparation of this Service Bulletin: . . . . . . . . . . 27 K. Publications Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 L. Interchangeability and Intermixability of Parts . . . . . . . . . . . . . . . . . . . . . . . . . 27

2. MATERIAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 A. Material - Price and Availability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 B. Industry Support Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 C. Parts Necessary For Each Airplane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

1. Kits/Parts: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

2. Parts and Materials Supplied by the Operator: . . . . . . . . . . . . . . . . . . . . . . 30

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

4. Parts Removed and Not Replaced: . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 D. Parts Necessary to Change Spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 E. Special Tooling - Price and Availability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 F. Special Tooling Necessary to do this Service Bulletin . . . . . . . . . . . . . . . . . . . . . 34

3. ACCOMPLISHMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 A. GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 B. WORK INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 FIGURE 1: FLIGHT CONTROLS - Trailing Edge Flap Transmission Replacement - Left Wing. . . . . 36 FIGURE 2: FLIGHT CONTROLS - Trailing Edge Flap Transmission Replacement - Right Wing . . . . 38 FIGURE 3: FLIGHT CONTROLS - Trailing Edge Flap Transmission No-Back Brake Replacement . . 40

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Commercial Airplane Group 747

SPECIAL ATTENTION Service Bulletin Number: 747-27-2422 Summary Date: October 30, 2008 ATA System: 2751 SUBJECT: FLIGHT CONTROLS - Trailing Edge Flap System - Transmission Positions 4 and 5 No-back Brake Replacement BOEING RECOMMENDS THAT EACH OPERATOR EXAMINE THIS SERVICE BULLETIN IMMEDIATELY.

CONCURRENT REQUIREMENTS None.

BACKGROUND This service bulletin gives the instructions and the necessary parts to replace the inboard Trailing Edge (TE) flap transmission carbon disk no-back brakes with skewed roller no-back brakes at the TE flap transmission, positions 4 and 5. The new skewed roller no-back brake will improve the disk brake friction coefficient variation and brake pressure plate deflection under load, reducing potential inboard flap blow-back. The flap blow-back occurs when the no-back brake fails to hold the TE flap in the commanded position. A flap blow-back can result in a decrease of the aerodynamic controllability of the airplane, which could adversely affect the airplane’s continued safe flight and landing.

Since 1999, four operators have reported that the inboard TE flaps blew back due to the failure of a transmission carbon disk no-back brake. The no-back brake did not hold the TE flaps in the commanded position. On approach, with landing flaps 25 or 30 selected, the inboard TE flaps failed to hold the commanded position and blew back to, approximately, flaps 10/15. This failure can cause an asymmetric flap blow-back if a torque tube becomes disconnected in combination with a failed no-back brake, or cause a symmetric flap blow-back if the hydraulic motor torque is lost in combination with two failed no-back brakes.

Boeing Service Related Problem (SRP) 747-SRP-27-0177 is related to this service bulletin.

ACTION Airplane Work

1. Remove Flap Transmission (positions 4 and 5) Component Work

1. Disassemble Flap Transmission

2. Replace Flap Transmission parts

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3. Assemble Flap Transmission

4. Change Flap Transmission part numbers

5. Do a functional test of the Flap Transmission Airplane Work

1. Install changed Flap Transmission (positions 4 and 5)

2. Do a functional test of the Flap operation

EFFECTIVITY 747-100/200/300/400/SR airplanes and excluding 747SP airplanes. Refer to Paragraph 1.A.1, Airplanes, for the list of affected airplanes.

COMPLIANCE Boeing recommends that this service bulletin be done not more than 5 years from the date on this service bulletin.

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.

INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are available for airplanes in warranty as of December 13, 2001. Please refer to Paragraph 2.B, Industry Support Information.

MANPOWER

MATERIAL INFORMATION Boeing Supplied Kits/Parts.

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

Airplanes Total Task Hours Elapsed Hours All 22 11 Components Total Task Hours Elapsed Hours All 3 3

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NO. 4 AND 5

NO-BACK BRAKE

REPLACE TRANSMISSION

TYPICAL TRANSMISSION SHOWN SEE A

FLAP TRANSMISSION UP FWD A U70261

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Commercial Airplane Group 747

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. An equivalent change is on subsequent production airplanes. Refer to PRR 85901-59S for data about this change.

Airplane models:

747-100 747-100B 747-100B SUD 747-200B 747-200C 747-200F 747-300 747-400 747-400D 747-400F 747SR

IDENTIFICATION BY CUSTOMER, CUSTOMER CODE, GROUP AND VARIABLE NUMBER AAR A/C ENG. SALES & LEASING (AFD) 1 RB681–RB682

AERO CONTROLS (AEO) 1 RA722–RA723

AEROLINEAS ARGENTINAS (ARG) 1 RD122–RD127 RT701–RT702 RT704

GROUP CONFIGURATION DESCRIPTION 1 - 747 airplanes, line numbers 1-1405, except 747SP airplanes.

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AEROSUR (REO) 1R S 2 3 5 AFRICA UNITED HOLDING CO. (UHD) 1 RB010 RD513

AFX (AXL) 1 RD201

AGES AIRCRAFT SALES & LEASING (AGJ) 1R B 0 0 4

AIR ATLANTA ICELANDIC (AID) 1 RB411–RB413 RB421 RD141–RD142 RD144 RD414 RD456 RD647–RD648 RD755 RD771 RD774 RR204 RR206 RR332 RS211 RS233 RS237 RS332–RS333 RT515 RT751

AIR CANADA (ACN) 1 RA749–RA750 RD531

AIR CHINA (BEJ) 1 RD782–RD783 RM341 RM811–RM813 RR451 RT031–RT035 RT878–RT880

AIR CHINA CARGO (CGC) 1 RL501–RL502 RT101 RT103

AIR FRANCE (AFA) 1 RD655 RD657–RD659 RD721–RD722 RD791 RL671–RL675 RM401–RM403 RR306 RR308–RR309 RT071–RT075 RT121 RT591 RT711–RT716

AIR GULF FALCON (GFG) 1R A 5 3 5 R A 5 3 7

AIR INDIA (AIN) 1 RA729 RA731 RS781–RS782 RT749 RU001–RU006

AIR NEW ZEALAND (ANZ) 1 RM082 RM191–RM192 RT671–RT673 RT703 RT932

AIR PACIFIC (APC) 1 RT502 RT504

AIR PULLMANTUR (PUL) 1 RS331 RT523 RT525

AIR UNIVERSAL (UVL) 1 RD291 RD649

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AIRBRIDGE CARGO (ABM) 1 RL576–RL577 RL579 RS762

ALBARAKA (AAB) 1 RB102

ALL NIPPON AIRWAYS (ANA) 1 RM231 RT753–RT755 RT776–RT777 RU831–RU841

AMERICAN AIRLINES (AAL) 1 RA266

AMIRI FLIGHT (ABD) 1 RM084 RT137

ARKIA ISRAELI AIRLINES (ARK) 1 RA253

ASIANA AIRLINES (AAR) 1 RM071 RM861–RM863 RR746–RR747 RT131–RT136 RU032

ATLAS AIR (TLS) 1 RD361–RD366 RD641 RD646 RD691–RD692 RD753–RD754 RJ333 RM891–RM899 RM901–RM906 RR301 RR748 RS722 RT752

AVIATION EXPOSURE MANAGEMENT (EXU) 1 RD131–RD132 RD143 AVION AIRCRAFT TRADING H.F. (VNG) 1 RT633–RT634 RT756

AWAS (AWW) 1 RJ321

BAHRAIN ROYAL FLIGHT (BHR) 1R M 4 2 6

BANC OF AMERICA LEASING (SBC) 1 RA106 RD001–RD002

BOEING (TBC) 1 RR222–RR223 BOEING AIRCRAFT HOLDING CO. (BHC) 1 RB691 RB693 RD181 RD451–RD454 RJ132

BOEING WICHITA MOD CENTER (WMC) 1 RD455

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BRITISH AIRWAYS (BAB) 1 RM096–RM097 RM136–RM145 RM261–RM264 RT471–RT499 RU121–RU132 C.A.L. CARGO AIR LINES (CRG) 1 RJ331–RJ332 C.I.T. LEASING CORPORATION (TCI) 1 RB011 RD047

CAPITAL ASSET MANAGEMENT (CPG) 1 RD053

CARGAIR (CGL) 1 RD203

CARGO B AIRLINES (CBO) 1 RD751 RR307 RR561

CARGOLUX AIRLINES (CLX) 1 RM881–RM890 RR701 RR721–RR724

CATHAY PACIFIC AIRWAYS (CAT) 1 RD358 RD581–RD583 RL581 RM856–RM859 RR441–RR442 RR951–RR952 RT451–RT469 RT508 RT511–RT512 RT514 RT517–RT518 RT522 RT528–RT529 RT781–RT782

CHINA AIRLINES (CHI) 1 RL411–RL430 RL481 RM021–RM024 RM441–RM443 RM445 RT636–RT640

CHINA CARGO (CIQ) 1 RL521–RL522

CHINA SOUTHERN AIRLINES (GUN) 1 RL751–RL752

CORSAIR (COR) 1 RS239–RS240 RT613–RT614 RT616 RT618–RT619 RT621

DRAGONAIR (DRG) 1 RR522 RS741 RS771 RT510 RT513 RT516 RT524

DUBAI AIR WING (DAW) 1 RD622 RM167–RM168 RT102

EL AL ISRAEL AIRLINES (ELA) 1 RD442 RJ152 RM091 RR225–RR226 RU081–RU083

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