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Commercial Airplanes 747 Requirements Bulletin ALERT Number: 747-53A2904 RB Original Issue: December 16, 2020 ATA System: 5312 SUBJECT: FUSELAGE - Center Section - STA 1000 Front Spar Shear Tie and Intercostal Lug Fitting Inspection and Repair 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.

9E991ECCN:

BOEING PROPRIETARY, CONFIDENTIAL AND/OR TRADE SECRET Copyright © 2020 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Unpublished Work.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: December 16, 2020 747-53A2904 RB 1 of 561

3.0

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Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

Original Issue: December 16, 2020 747-53A2904 RB 2 of 561 REQUIREMENTS BULLETIN 747-53A2904

ALERTALERT

BLANK PAGE

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Table of Contents

1. EFFECTIVITY7

A. Airplanes7

B. Spares Affected11

2. CONCURRENT REQUIREMENTS11

3. COMPLIANCE11

4. APPROVAL21

5. ACCOMPLISHMENT INSTRUCTIONS23

A. General Information23

B. Work Instructions24

FIGURE 1: LEFT SIDE - STA 1000 FRONT SPAR - SHEAR TIE AND INTERCOSTAL LUG FITTING -

DETAILED INSPECTION AND SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC)

INSPECTION [Group 1-2, Configuration 2]43

FIGURE 2: LEFT SIDE - STA 1000 FRONT SPAR - LBL 11.33 SHEAR TIE - REMOVAL [Group 2,

Configuration 2]50

FIGURE 3: LEFT SIDE - STA 1000 FRONT SPAR - LBL 11.33 SHEAR TIE - INSTALLATION [Group 2,

Configuration 2]55

FIGURE 4: LEFT SIDE - STA 1000 FRONT SPAR - LBL 11.33 INTERCOSTAL LUG FITTING - REMOVAL

[Group 2, Configuration 2]62

FIGURE 5: LEFT SIDE - STA 1000 FRONT SPAR - LBL 11.33 INTERCOSTAL LUG FITTING -

INSTALLATION [Group 2, Configuration 2]67

FIGURE 6: LEFT SIDE - STA 1000 FRONT SPAR - LBL 11.33 SHEAR TIE AND INTERCOSTAL LUG

FITTING - REMOVAL [Group 2, Configuration 2]74

FIGURE 7: LEFT SIDE - STA 1000 FRONT SPAR - LBL 11.33 SHEAR TIE AND INTERCOSTAL LUG

FITTING - INSTALLATION [Group 2, Configuration 2]80

FIGURE 8: LEFT SIDE - STA 1000 FRONT SPAR - LBL 33.99 SHEAR TIE - REMOVAL [Group 2,

Configuration 2]89

FIGURE 9: LEFT SIDE - STA 1000 FRONT SPAR - LBL 33.99 SHEAR TIE - INSTALLATION [Group 2,

Configuration 2]95

FIGURE 10: LEFT SIDE - STA 1000 FRONT SPAR - LBL 57.50 SHEAR TIE - REMOVAL [Group 2,

Configuration 2]103

FIGURE 11: LEFT SIDE - STA 1000 FRONT SPAR - LBL 57.50 SHEAR TIE - INSTALLATION [Group 2,

Configuration 2]109

FIGURE 12: LEFT SIDE - STA 1000 FRONT SPAR - LBL 75.92 SHEAR TIE - REMOVAL [Group 2,

Configuration 2]117

FIGURE 13: LEFT SIDE - STA 1000 FRONT SPAR - LBL 75.92 SHEAR TIE - INSTALLATION [Group 2,

Configuration 2]123

FIGURE 14: RIGHT SIDE - STA 1000 FRONT SPAR - SHEAR TIE AND INTERCOSTAL LUG FITTING -

DETAILED INSPECTION AND SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC)

INSPECTION [Group 1-2, Configuration 2]131

FIGURE 15: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 11.33 SHEAR TIE - REMOVAL [Group 2,

Configuration 2]138

FIGURE 16: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 11.33 SHEAR TIE - INSTALLATION [Group 2,

Configuration 2]143

FIGURE 17: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 11.33 INTERCOSTAL LUG FITTING - REMOVAL

[Group 2, Configuration 2]150

FIGURE 18: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 11.33 INTERCOSTAL LUG FITTING -

INSTALLATION [Group 2, Configuration 2]155

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

Original Issue: December 16, 2020 747-53A2904 RB 3 of 561 REQUIREMENTS BULLETIN 747-53A2904

ALERTALERT

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FIGURE 19: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 11.33 SHEAR TIE AND INTERCOSTAL LUG

FITTING - REMOVAL [Group 2, Configuration 2]162

FIGURE 20: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 11.33 SHEAR TIE AND INTERCOSTAL LUG

FITTING - INSTALLATION [Group 2, Configuration 2]168

FIGURE 21: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 33.99 SHEAR TIE - REMOVAL [Group 2,

Configuration 2]177

FIGURE 22: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 33.99 SHEAR TIE - INSTALLATION [Group 2,

Configuration 2]183

FIGURE 23: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 57.50 SHEAR TIE - REMOVAL [Group 2,

Configuration 2]191

FIGURE 24: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 57.50 SHEAR TIE - INSTALLATION [Group 2,

Configuration 2]197

FIGURE 25: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 75.92 SHEAR TIE - REMOVAL [Group 2,

Configuration 2]205

FIGURE 26: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 75.92 SHEAR TIE - INSTALLATION [Group 2,

Configuration 2]211

FIGURE 27: LEFT SIDE - STA 1000 FRONT SPAR - SHEAR TIE AND INTERCOSTAL LUG FITTING -

DETAILED INSPECTION AND SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC)

INSPECTION [Group 3, Configuration 1, 3]219

FIGURE 28: LEFT SIDE - STA 1000 FRONT SPAR - SHEAR TIE AND INTERCOSTAL LUG FITTING -

DETAILED INSPECTION AND SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC)

INSPECTION [Group 3, Configuration 2, 4]226

FIGURE 29: LEFT SIDE - STA 1000 FRONT SPAR - LBL 11.33 SHEAR TIE - REMOVAL [Group 3,

Configuration 1]233

FIGURE 30: LEFT SIDE - STA 1000 FRONT SPAR - LBL 11.33 SHEAR TIE - INSTALLATION [Group 3,

Configuration 1]238

FIGURE 31: LEFT SIDE - STA 1000 FRONT SPAR - LBL 11.33 SHEAR TIE - REMOVAL [Group 3,

Configuration 2]245

FIGURE 32: LEFT SIDE - STA 1000 FRONT SPAR - LBL 11.33 SHEAR TIE - INSTALLATION [Group 3,

Configuration 2]250

FIGURE 33: LEFT SIDE - STA 1000 FRONT SPAR - LBL 11.33 INTERCOSTAL LUG FITTING - REMOVAL

[Group 3]257

FIGURE 34: LEFT SIDE - STA 1000 FRONT SPAR - LBL 11.33 INTERCOSTAL LUG FITTING -

INSTALLATION [Group 3]262

FIGURE 35: LEFT SIDE - STA 1000 FRONT SPAR - LBL 11.33 SHEAR TIE AND INTERCOSTAL LUG

FITTING - REMOVAL [Group 3, Configuration 1]269

FIGURE 36: LEFT SIDE - STA 1000 FRONT SPAR - LBL 11.33 SHEAR TIE AND INTERCOSTAL LUG

FITTING - INSTALLATION [Group 3, Configuration 1]275

FIGURE 37: LEFT SIDE - STA 1000 FRONT SPAR - LBL 11.33 SHEAR TIE AND INTERCOSTAL LUG

FITTING - REMOVAL [Group 3, Configuration 2]284

FIGURE 38: LEFT SIDE - STA 1000 FRONT SPAR - LBL 11.33 SHEAR TIE AND INTERCOSTAL LUG

FITTING - INSTALLATION [Group 3, Configuration 2]291

FIGURE 39: LEFT SIDE - STA 1000 FRONT SPAR - LBL 33.99 SHEAR TIE - REMOVAL [Group 3,

Configuration 3]300

FIGURE 40: LEFT SIDE - STA 1000 FRONT SPAR - LBL 33.99 SHEAR TIE - INSTALLATION [Group 3,

Configuration 3]306

FIGURE 41: LEFT SIDE - STA 1000 FRONT SPAR - LBL 33.99 SHEAR TIE - REMOVAL [Group 3,

Configuration 4]315

FIGURE 42: LEFT SIDE - STA 1000 FRONT SPAR - LBL 33.99 SHEAR TIE - INSTALLATION [Group 3,

Configuration 4]321

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

Original Issue: December 16, 2020 747-53A2904 RB 4 of 561 REQUIREMENTS BULLETIN 747-53A2904

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FIGURE 43: LEFT SIDE - STA 1000 FRONT SPAR - LBL 57.50 SHEAR TIE - REMOVAL [Group 3,

Configuration 3]330

FIGURE 44: LEFT SIDE - STA 1000 FRONT SPAR - LBL 57.50 SHEAR TIE - INSTALLATION [Group 3,

Configuration 3]336

FIGURE 45: LEFT SIDE - STA 1000 FRONT SPAR - LBL 57.50 SHEAR TIE - REMOVAL [Group 3,

Configuration 4]345

FIGURE 46: LEFT SIDE - STA 1000 FRONT SPAR - LBL 57.50 SHEAR TIE - INSTALLATION [Group 3,

Configuration 4]351

FIGURE 47: LEFT SIDE - STA 1000 FRONT SPAR - LBL 75.92 SHEAR TIE - REMOVAL [Group 3,

Configuration 3]360

FIGURE 48: LEFT SIDE - STA 1000 FRONT SPAR - LBL 75.92 SHEAR TIE - INSTALLATION [Group 3,

Configuration 3]366

FIGURE 49: LEFT SIDE - STA 1000 FRONT SPAR - LBL 75.92 SHEAR TIE - REMOVAL [Group 3,

Configuration 4]375

FIGURE 50: LEFT SIDE - STA 1000 FRONT SPAR - LBL 75.92 SHEAR TIE - INSTALLATION [Group 3,

Configuration 4]381

FIGURE 51: RIGHT SIDE - STA 1000 FRONT SPAR - SHEAR TIE AND INTERCOSTAL LUG FITTING -

DETAILED INSPECTION AND SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC)

INSPECTION [Group 3, Configuration 1, 3]390

FIGURE 52: RIGHT SIDE - STA 1000 FRONT SPAR - SHEAR TIE AND INTERCOSTAL LUG FITTING -

DETAILED INSPECTION AND SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC)

INSPECTION [Group 3, Configuration 2, 4-6]397

FIGURE 53: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 11.33 SHEAR TIE - REMOVAL [Group 3,

Configuration 1]404

FIGURE 54: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 11.33 SHEAR TIE - INSTALLATION [Group 3,

Configuration 1]409

FIGURE 55: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 11.33 SHEAR TIE - REMOVAL [Group 3,

Configuration 2]416

FIGURE 56: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 11.33 SHEAR TIE - INSTALLATION [Group 3,

Configuration 2]421

FIGURE 57: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 11.33 INTERCOSTAL LUG FITTING - REMOVAL

[Group 3]428

FIGURE 58: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 11.33 INTERCOSTAL LUG FITTING -

INSTALLATION [Group 3]433

FIGURE 59: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 11.33 SHEAR TIE AND INTERCOSTAL LUG

FITTING - REMOVAL [Group 3, Configuration 1]440

FIGURE 60: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 11.33 SHEAR TIE AND INTERCOSTAL LUG

FITTING - INSTALLATION [Group 3, Configuration 1]446

FIGURE 61: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 11.33 SHEAR TIE AND INTERCOSTAL LUG

FITTING - REMOVAL [Group 3, Configuration 2]455

FIGURE 62: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 11.33 SHEAR TIE AND INTERCOSTAL LUG

FITTING - INSTALLATION [Group 3, Configuration 2]462

FIGURE 63: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 33.99 SHEAR TIE - REMOVAL [Group 3,

Configuration 3]471

FIGURE 64: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 33.99 SHEAR TIE - INSTALLATION [Group 3,

Configuration 3]477

FIGURE 65: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 33.99 SHEAR TIE - REMOVAL [Group 3,

Configuration 4]486

FIGURE 66: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 33.99 SHEAR TIE - INSTALLATION [Group 3,

Configuration 4]492

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

Original Issue: December 16, 2020 747-53A2904 RB 5 of 561 REQUIREMENTS BULLETIN 747-53A2904

ALERTALERT

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FIGURE 67: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 33.99 SHEAR TIE - REMOVAL [Group 3,

Configuration 5]501

FIGURE 68: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 33.99 SHEAR TIE - INSTALLATION [Group 3,

Configuration 5]507

FIGURE 69: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 57.50 SHEAR TIE - REMOVAL [Group 3,

Configuration 4]516

FIGURE 70: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 57.50 SHEAR TIE - INSTALLATION [Group 3,

Configuration 4]522

FIGURE 71: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 57.50 SHEAR TIE - REMOVAL [Group 3,

Configuration 6]531

FIGURE 72: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 57.50 SHEAR TIE - INSTALLATION [Group 3,

Configuration 6]538

FIGURE 73: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 75.92 SHEAR TIE - REMOVAL [Group 3,

Configuration 4]547

FIGURE 74: RIGHT SIDE - STA 1000 FRONT SPAR - RBL 75.92 SHEAR TIE - INSTALLATION [Group 3,

Configuration 4]553

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

Original Issue: December 16, 2020 747-53A2904 RB 6 of 561 REQUIREMENTS BULLETIN 747-53A2904

ALERTALERT

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Commercial Airplanes 747 Requirements Bulletin ALERT Number: 747-53A2904 RB Original Issue: December 16, 2020 ATA System: 5312 SUBJECT: FUSELAGE - Center Section - STA 1000 Front Spar Shear Tie and Intercostal Lug Fitting Inspection and Repair

THIS DOCUMENT IS SENT TO THE OPERATORS OF RECORD OF THE AIRPLANES SHOWN IN PARAGRAPH 1.A., EFFECTIVITY. IF AN AIRPLANE HAS BEEN LEASED OR SOLD, SEND THIS DOCUMENT TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS DOCUMENT TO THE NEW OWNER. THIS IS AN ENHANCED REQUIRED FOR COMPLIANCE DOCUMENT. THE BOEING

PROCESSES USED TO CREATE THE SERVICE BULLETIN (SB) AND THE REQUIREMENTS BULLETIN (RB) ENSURE THAT THE INFORMATION BETWEEN "RC START" AND "RC END" IN THE SB ARE IDENTICAL TO THE INFORMATION IN THE SAME SECTIONS (COMPLIANCE, WORK INSTRUCTIONS…) OF THE RB WHICH THE SB REFERS TO AS THE RELATED DOCUMENT.

1. Effectivity A. Airplanes This bulletin is applicable to 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SP, 747SR Airplane(s), line number(s) 1-1419 in 3 Group(s). Where the effectivity is presented with hyphens between line numbers, the airplane applicability means "through" and "inclusive", e.g. line numbers 1-9 means line numbers 1 through 9 inclusive.

The Variable Numbers and Group Information for the applicable airplanes is given below.

DESCRIPTIONCONFIGURATIONGROUP All 747-100/-100B/-100B SUD/-200B/-200C/-200F/-300/747SP/747SR aiplanes.

- 1 Airplanes without a main deck side cargo door or nose cargo door.1 Airplanes with a main deck side cargo door or nose cargo door.2 All 747-400/-400D/-400F airplanes.- 2 Airplanes without a main deck side cargo door.1 Airplanes with a main deck side cargo door.2 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

Original Issue: December 16, 2020 747-53A2904 RB 7 of 561

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DESCRIPTIONCONFIGURATIONGROUP All 747-400 airplanes modified to 747-400 Boeing Converted Freighter (BCF).

- 3 Airplanes with a standoff installed on the shear tie at BL 11.33 and no support angle.

1 Airplanes with a support angle installed on the shear tie at BL 11.33 and no standoff.

2 Airplanes with a standoff installed on the shear tie at BL 33.99, or BL

57.50, or BL 75.92.

3 Airplanes with no standoff installed on the shear tie at BL 33.99, or BL 57.50, or BL 75.92.

4 Airplanes with a water bracket installed on the shear tie at RBL 33.99.5 Airplanes with a support angle installed on the shear tie at RBL 57.50.6 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 GroupVariable Number 1RA001 - RA034 1RA101 - RA115 1RA161 - RA164 1RA201 - RA203 1RA216 - RA217 1RA245 - RA246 1RA251 - RA266 1RA301 - RA318 1RA351 - RA360 1RA369 - RA373 1RA401 - RA418 1RA501 - RA502 1RA521 - RA528 1RA532 - RA548 GroupVariable Number 1RA551 - RA552 1RA559 - RA561 1RA581 - RA582 1RA585 1RA601 - RA602 1RA631 - RA635 1RA651 - RA652 1RA671 - RA677 1RA701 - RA702 1RA721 - RA731 1RA741 - RA745 1RA749 - RA750 1RA761 - RA762 1RA781 - RA784 GroupVariable Number 1RA901 - RA916 1RB001 - RB016 1RB041 - RB044 1RB071 - RB075 1RB101 - RB102 1RB411 - RB413 1RB421 1RB601 - RB607 1RB681 - RB697 1RB711 1RB721 - RB723 1RB741 - RB748 1RD001 - RD004 1RD021 - RD022 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

Original Issue: December 16, 2020 747-53A2904 RB 8 of 561 REQUIREMENTS BULLETIN 747-53A2904

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GroupVariable Number 1RD041 - RD059 1RD071 - RD072 1RD081 - RD083 1RD091 - RD092 1RD101 - RD104 1RD121 - RD127 1RD131 - RD144 1RD166 - RD167 1RD171 - RD172 1RD181 - RD183 1RD201 - RD204 1RD221 - RD227 1RD231 - RD235 1RD241 - RD243 1RD251 - RD262 1RD271 - RD272 1RD291 - RD292 1RD301 - RD302 1RD311 1RD351 - RD358 1RD361 - RD366 1RD381 - RD383 1RD411 - RD414 1RD421 - RD426 1RD431 - RD435 1RD441 - RD442 1RD451 - RD456 1RD461 1RD471 - RD475 1RD513 - RD519 1RD531 - RD533 1RD551 1RD561 GroupVariable Number 1RD571 1RD581 - RD583 1RD591 - RD593 1RD601 - RD607 1RD621 - RD623 1RD641 - RD649 1RD651 - RD659 1RD661 1RD671 1RD681 - RD682 1RD691 - RD692 1RD701 - RD702 1RD721 - RD722 1RD741 - RD742 1RD751 - RD755 1RD761 1RD771 - RD775 1RD781 - RD783 1RD791 - RD792 1RE001 2RF001 - RF006 1RG001 - RG009 1RG091 1RG095 1RG101 - RG104 1RG121 - RG126 1RG141 - RG142 1RG161 - RG164 1RG171 - RG174 1RG191 - RG193 1RG211 - RG213 1RG221 - RG222 1RH101 - RH102 GroupVariable Number 1RH111 - RH112 1RH121 - RH122 1RJ131 - RJ133 1RJ151 - RJ152 1RJ301 - RJ303 1RJ321 - RJ322 1RJ331 - RJ333 2RL401 - RL403 2RL411 - RL436 2RL451 - RL456 2RL461 - RL462 2RL471 - RL481 2RL491 - RL492 2RL501 - RL502 2RL511 - RL516 2RL521 - RL522 2RL531 - RL534 2RL551 2RL561 - RL568 2RL571 - RL572 2RL576 - RL577 2RL579 2RL581 - RL586 2RL651 - RL655 2RL671 - RL675 2RL681 - RL684 2RL751 - RL752 2RM001 - RM007 2RM010 - RM013 2RM021 - RM024 2RM026 - RM030 2RM036 - RM045 2RM051 - RM053 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

Original Issue: December 16, 2020 747-53A2904 RB 9 of 561 REQUIREMENTS BULLETIN 747-53A2904

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GroupVariable Number 2RM071 2RM081 - RM084 2RM091 2RM096 - RM097 2RM116 - RM117 2RM126 - RM127 3RM128 2RM129 - RM132 2RM136 - RM147 2RM156 - RM158 2RM166 - RM177 2RM191 - RM192 2RM231 - RM233 2RM241 - RM246 2RM261 - RM264 2RM316 - RM318 2RM331 - RM333 2RM341 2RM351 - RM355 2RM366 - RM367 2RM401 - RM403 2RM426 2RM431 2RM441 - RM443 2RM445 2RM801 - RM803 2RM811 - RM813 2RM851 - RM859 2RM861 - RM863 2RM871 - RM899 2RM901 - RM906 2RM911 1RR001 - RR005 GroupVariable Number 1RR021 - RR025 1RR031 1RR201 - RR206 1RR221 - RR226 1RR261 - RR267 1RR301 - RR310 1RR331 - RR332 1RR336 1RR341 - RR345 1RR361 - RR362 1RR421 - RR422 1RR431 - RR432 1RR441 - RR442 1RR451 1RR501 - RR504 1RR521 - RR522 1RR526 1RR531 1RR551 - RR556 1RR561 1RR566 2RR701 2RR721 - RR724 2RR746 - RR748 2RR851 - RR856 2RR861 - RR862 2RR951 - RR952 1RS001 - RS002 1RS201 1RS211 - RS212 1RS221 - RS222 1RS231 - RS241 1RS251 - RS259 GroupVariable Number 1RS263 1RS265 - RS268 1RS271 - RS276 1RS291 - RS292 1RS301 - RS306 1RS311 - RS320 1RS331 - RS333 1RS341 - RS342 1RS699 1RS701 - RS703 1RS711 - RS713 1RS721 - RS722 1RS731 - RS732 1RS741 - RS743 1RS751 - RS752 1RS761 - RS762 1RS771 1RS781 - RS782 1RS786 2RT001 - RT014 3RT021 - RT022 3RT031 - RT033 2RT034 - RT035 2RT041 - RT047 3RT061 3RT071 - RT072 2RT073 - RT074 3RT075 2RT101 - RT103 2RT121 2RT131 - RT137 2RT151 - RT152 3RT161 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

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GroupVariable Number 2RT162 - RT163 3RT164 2RT165 - RT168 2RT401 - RT412 2RT431 - RT447 2RT451 - RT455 3RT456 2RT457 - RT460 3RT461 2RT462 - RT469 2RT471 - RT499 3RT501 2RT502 - RT505 3RT506 - RT510 2RT511 - RT512 3RT513 2RT514 - RT515 3RT516 2RT517 3RT518 - RT520 2RT521 - RT523 3RT524 2RT525 3RT526 GroupVariable Number 2RT527 3RT528 2RT529 3RT530 2RT531 - RT535 2RT551 - RT568 2RT571 3RT572 - RT579 2RT580 - RT591 2RT601 - RT641 3RT642 2RT643 - RT653 3RT654 - RT657 2RT671 - RT673 2RT681 - RT682 3RT691 - RT692 2RT693 - RT699 2RT701 - RT704 2RT711 - RT717 2RT741 - RT750 3RT751 - RT752 2RT753 - RT757 2RT776 - RT777 3RT781 - RT782 GroupVariable Number 2RT783 - RT784 2RT801 - RT803 2RT811 - RT814 2RT831 - RT836 3RT837 2RT861 - RT864 2RT876 - RT880 2RT931 - RT932 2RT945 - RT949 2RT951 - RT955 2RT966 3RT967 2RU001 - RU006 2RU016 - RU017 2RU031 - RU032 2RU051 - RU052 2RU059 - RU062 2RU081 - RU083 2RU101 - RU102 2RU121 - RU132 2RU801 - RU809 2RU831 - RU841 -- -- B. Spares Affected None.

2. CONCURRENT REQUIREMENTS None.

3. COMPLIANCE The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to Requirements Bulletin 747-53A2904 RB. The Airworthiness Directive will make the compliance tasks and times given in Requirements Bulletin 747-53A2904 RB mandatory.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

Original Issue: December 16, 2020 747-53A2904 RB 11 of 561 REQUIREMENTS BULLETIN 747-53A2904

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Accomplish the required actions, based on the applicable conditions in Tables 1 through 6, in accordance with Accomplishment Instructions.

When more than one OPTION is given for a CONDITION, do only one of the OPTION numbers. When more than one ACTION is given for a CONDITION or an OPTION, do all of the ACTION numbers for that CONDITION or OPTION.

Group 1-2, Configuration 1:

No further action required.

Group 1, Configuration 2:

Table 1: Detailed Inspection and Surface High Frequency Eddy Current (HFEC) Inspection of the STA 1000 Front Spar Shear Tie at Left Buttock Line (LBL) 11.33, LBL 33.99, LBL 57.50, LBL 75.92, and Intercostal Lug Fitting at LBL 11.33 Repeat Interval (Not to Exceed) Compliance Time (Whichever Occurs Later) ActionCondition -Within 1,900 flight cycles after the Original Issue date of Requirements Bulletin 747- 53A2904 RB.

Before 6,000 total flight cycles.

Do a detailed inspection and surface HFEC inspection of the STA 1000 front spar shear tie at LBL 11.33, LBL 33.99, LBL 57.50, LBL 75.92, and intercostal lug fitting at LBL

11.33 for any crack.

All airplanes.

-Before further flight.CONDITION 1 (ACTION 1):CONDITION 1:

Contact The Boeing Company for repair instructions and do the repair.

ANY CRACK FOUND ON

THE FRONT SPAR SHEAR TIE AT LBL 11.33, LBL 33.99, LBL 57.50, LBL

75.92, OR INTERCOSTAL

LUG FITTING AT LBL

11.33.

2,100 flight cycles.

-CONDITION 1 (ACTION 2):

Repeat detailed inspection and surface HFEC inspection of the STA 1000 front spar shear tie at LBL 11.33, LBL

33.99, LBL 57.50, LBL 75.92, and intercostal lug fitting at LBL 11.33 for any crack.

2,100 flight cycles.

-Repeat detailed inspection and surface HFEC inspection of the STA 1000 front spar shear tie at LBL 11.33, LBL

33.99, LBL 57.50, LBL 75.92, and intercostal lug fitting at LBL 11.33 for any crack.

CONDITION 2:

NO CRACK FOUND ON

THE FRONT SPAR SHEAR TIE AT LBL 11.33, LBL 33.99, LBL 57.50, LBL

75.92, OR INTERCOSTAL

LUG FITTING AT LBL

11.33.

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Original Issue: December 16, 2020 747-53A2904 RB 12 of 561 REQUIREMENTS BULLETIN 747-53A2904

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