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Commercial Airplanes 747 Requirements Bulletin ALERT Number: 747-53A2910 RB Original Issue: September 21, 2022 ATA System: 5300 SUBJECT: FUSELAGE STRUCTURE - General - Stringers Forward and Aft of the Pressure Bulkhead at Body Station (STA) 2360 Inspection EXPORT CONTROLLED - This technology or software is subject to the U.S. Export Administration Regulations (EAR), (15 C.F.R. Parts 730-774). No authorization from the U.S. Department of Commerce is required for export, re-export, in-country transfer, or access EXCEPT to country group E:1 or E:2 countries/persons per Supp.1 to Part 740 of the EAR.

9E991ECCN:

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: September 21, 2022 747-53A2910 RB 1 of 108

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Original Issue: September 21, 2022 747-53A2910 RB 2 of 108 REQUIREMENTS BULLETIN 747-53A2910

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Table of Contents

1 . E F F E C T I V I T Y5

A. Airplanes5

B . S p a r e s A f f e c t e d6

2. CONCURRENT REQUIREMENTS6

3 . C O M P L I A N C E6

4. APPROVAL ................................................ 1 9

5. ACCOMPLISHMENT INSTRUCTIONS .................................. 2 1 A. General Information ......................................... 2 1 B. Work Instructions ........................................... 2 2 FIGURE 1: LEFT SIDE - STRINGER ASSEMBLIES S-3L TO S-5L, FORWARD OF THE PRESSURE BULKHEAD AT STA 2360 - INSPECTION [Group 1] ..................... 3 5 FIGURE 2: LEFT SIDE - STRINGER ASSEMBLIES S-1L, S-2L, S-6L TO S-12L, S-14L, S-15L AND S-17L, FORWARD OF THE PRESSURE BULKHEAD AT STA 2360 - INSPECTION [Group 1] . . 40 FIGURE 3: LEFT SIDE - STRINGER ASSEMBLIES S-18L TO S-25L, S-34L, S-36L, S-38L, S-40L, S-42L, S-44L, S-46L AND S-48L TO S-51L, FORWARD OF THE PRESSURE BULKHEAD AT STA 2360 - INSPECTION [Group 1] ................................ 4 5 FIGURE 4: RIGHT SIDE - STRINGER ASSEMBLIES S-3R TO S-5R, FORWARD OF THE PRESSURE BULKHEAD AT STA 2360 - INSPECTION [Group 1] ..................... 4 9 FIGURE 5: RIGHT SIDE - STRINGER ASSEMBLIES S-1R, S-2R, S-6R TO S-12R, S-14R, S-15R AND S-17R, FORWARD OF THE PRESSURE BULKHEAD AT STA 2360 - INSPECTION [Group 1] .................................................. 5 4 FIGURE 6: RIGHT SIDE - STRINGER ASSEMBLIES S-18R TO S-25R, S-34R, S-36R, S-38R, S-40R, S-42R, S-44R, S-46R AND S-48R TO S-51R, FORWARD OF THE PRESSURE BULKHEAD AT STA 2360 - INSPECTION [Group 1] ............................ 5 9 FIGURE 7: LEFT SIDE - STRINGER ASSEMBLIES S-3L TO S-5L AND S-13L TO S-17L, FORWARD OF THE PRESSURE BULKHEAD AT STA 2360 - INSPECTION [Group 2] .......... 6 3 FIGURE 8: LEFT SIDE - STRINGER ASSEMBLIES S-1L, S-2L AND S-6L TO S-12L, FORWARD OF THE PRESSURE BULKHEAD AT STA 2360 - INSPECTION [Group 2] ............. 6 8 FIGURE 9: LEFT SIDE - STRINGER ASSEMBLIES S-18L TO S-25L, S-34L, S-36L, S-38L, S-40L, S-42L, S-44L, S-46L AND S-48L TO S-51L, FORWARD OF THE PRESSURE BULKHEAD AT STA 2360 - INSPECTION [Group 2] ................................ 7 3 FIGURE 10: RIGHT SIDE - STRINGER ASSEMBLIES S-3R TO S-5R AND S-13R TO S-17R, FORWARD OF THE PRESSURE BULKHEAD AT STA 2360 - INSPECTION [Group 2] ........ 7 7 FIGURE 11: RIGHT SIDE - STRINGER ASSEMBLIES S-1R, S-2R AND S-6R TO S-12R, FORWARD OF THE PRESSURE BULKHEAD AT STA 2360 - INSPECTION [Group 2] .......... 8 2 FIGURE 12: RIGHT SIDE - STRINGER ASSEMBLIES S-18R TO S-25R, S-34R, S-36R, S-38R, S-40R, S-42R, S-44R, S-46R, AND S-48R TO S-51R, FORWARD OF THE PRESSURE BULKHEAD AT STA 2360 - INSPECTION [Group 2] ............................ 8 7 FIGURE 13: LEFT SIDE - STRINGER ASSEMBLIES S-1L TO S-3L, AFT OF THE PRESSURE BULKHEAD AT STA 2360 - INSPECTION ................................. 9 1 FIGURE 14: LEFT SIDE - STRINGER ASSEMBLIES S-4L TO S-10L, S-12L TO S-16L, S-18L TO S-22L, S-24L TO S-26L, S-34L, S-36L, S-38L, S-40L, S-42L, S-44L, S-46L AND S-48L TO S-51L, AFT OF THE PRESSURE BULKHEAD AT STA 2360 - INSPECTION .............. 9 6 FIGURE 15: RIGHT SIDE - STRINGER ASSEMBLIES S-1R TO S-3R, AFT OF THE PRESSURE BULKHEAD AT STA 2360 - INSPECTION ................................ 1 0 0 FIGURE 16: RIGHT SIDE - STRINGER ASSEMBLIES S-4R TO S-10R, S-12R TO S-16R, S-18R TO S-22R, S-24R TO S-26R, S-34R, S-36R, S-38R, S-40R, S-42R, S-44R, S-46R AND S-48R TO S-51R, AFT OF THE PRESSURE BULKHEAD AT STA 2360 - INSPECTION ........... 1 0 5 Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.

Original Issue: September 21, 2022 747-53A2910 RB 3 of 108 REQUIREMENTS BULLETIN 747-53A2910

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Original Issue: September 21, 2022 747-53A2910 RB 4 of 108 REQUIREMENTS BULLETIN 747-53A2910

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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 747-8, 747-8F Airplane(s), line number(s) 1420-1574 in 2 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 747-8 Airplanes.-1 747-8F Airplanes.-2 Airplane Models:

747-8, 747-8F GroupVariable Number 1RC001 - RC009 1RC021 - RC040 1RC051 - RC060 1RC066 - RC072 GroupVariable Number 1RC076 - RC077 2RC501 - RC514 2RC521 - RC528 2RC531 - RC541 GroupVariable Number 2RC546 - RC566 2RC571 - RC582 2RC601 - RC610 2RC641 - RC644 Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.

Original Issue: September 21, 2022 747-53A2910 RB 5 of 108

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GroupVariable Number 2RC651 - RC652 2RC661 GroupVariable Number 2RC671 - RC674 2RC681 - RC696 GroupVariable Number 2RC701 - RC704 -- 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 747-53A2910 RB. The Airworthiness Directive will make the compliance tasks and times given in Requirements Bulletin 747-53A2910 RB mandatory.

Group 1:

Accomplish the required action(s), based on the applicable condition(s) in Table(s) 1, 2, 5, and 6, in accordance with Accomplishment Instructions.

Group 2:

Accomplish the required action(s), based on the applicable condition(s) in Table(s) 3, 4, 5, and 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.

Original Issue: September 21, 2022 747-53A2910 RB 6 of 108 REQUIREMENTS BULLETIN 747-53A2910

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Group 1:

Table 1: Left side, Inspection of Stringers Forward of the Pressure Bulkhead at Body Station (STA) 2360 Repeat Interval (Not to Exceed) Boeing Recommended Compliance Time (Whichever Occurs Later) ActionCondition -Within 36 months after the Original Issue date of Requirements Bulletin 747-53A2910 RB.

Before 8,000 total flight cycles or 8 years after the date of issuance of the original standard certificate of airworthiness or the original export certificate of airworthiness, whichever occurs first.

ACTION 1: Do a Low Frequency Eddy Current (LFEC) inspection of stringer sidewalls and a detailed inspection of stringer assemblies S- 3L to S-5L for any crack.

All Airplanes.

ACTION 2: Do a High Frequency Eddy Current (HFEC) inspection of stringer sidewalls and a detailed inspection of stringer assemblies S- 1L, S-2L, S-6L to S-12L, S- 14L, S-15L and S-17L for any crack.

ACTION 3: Do a detailed inspection of stringer assemblies S-18L to S-25L, S-34L, S-36L, S-38L, S-40L, S-42L, S-44L, S-46L and S-48L to S- 51L for any crack.

8,000 flight cycles or 8 years, whichever occurs first.

-Repeat the LFEC inspection of stringer sidewalls and the detailed inspection of stringer assemblies S-3L to S-5L for any crack.

CONDITION 1: NO

CRACK FOUND

DURING THE LFEC

INSPECTION OF

STRINGER SIDE-

WALLS AND THE

DETAILED INSPEC-

TION OF STRINGER ASSEMBLIES S-3L TO S-5L -Before further flight.CONDITION 2 (ACTION 1):

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

CONDITION 2: ANY

CRACK FOUND

DURING THE LFEC

INSPECTION OF

STRINGER SIDE-

WALLS OR THE DE-

TAILED INSPECTION

OF STRINGER AS- SEMBLIES S-3L TO S-5L 8,000 flight cycles or 8 years, whichever occurs first.

-CONDITION 2 (ACTION 2):

Repeat the LFEC inspection of stringer sidewalls and the detailed inspection of stringer assemblies S-3L to S-5L for any crack.

Original Issue: September 21, 2022 747-53A2910 RB 7 of 108 REQUIREMENTS BULLETIN 747-53A2910

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Group 1:

Table 1: Left side, Inspection of Stringers Forward of the Pressure Bulkhead at Body Station (STA) 2360 Repeat Interval (Not to Exceed) Boeing Recommended Compliance Time (Whichever Occurs Later) ActionCondition 8,000 flight cycles or 8 years, whichever occurs first.

-Repeat the HFEC inspection of stringer sidewalls and the detailed inspection of stringer assemblies S-1L, S-2L, S-6L to S-12L, S-14L, S-15L and S-17L for any crack.

CONDITION 3: NO

CRACK FOUND

DURING THE HFEC

INSPECTION OF

STRINGER SIDE-

WALLS AND THE

DETAILED INSPEC-

TION OF STRINGER ASSEMBLIES S-1L, S-2L, S-6L TO S-12L, S-14L, S-15L AND S- 17L -Before further flight.CONDITION 4 (ACTION 1):

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

CONDITION 4: ANY

CRACK FOUND

DURING THE HFEC

INSPECTION OF

STRINGER SIDE-

WALLS OR THE DE-

TAILED INSPECTION

OF STRINGER AS- SEMBLIES S-1L, S- 2L, S-6L TO S-12L, S-14L, S-15L AND S- 17L 8,000 flight cycles or 8 years, whichever occurs first.

-CONDITION 4 (ACTION 2):

Repeat the HFEC inspection of stringer sidewalls and the detailed inspection of stringer assemblies S-1L, S-2L, S-6L to S-12L, S-14L, S-15L and S-17L for any crack.

8,000 flight cycles or 8 years, whichever occurs first.

-Repeat the detailed inspection of stringer assemblies S- 18L to S-25L, S-34L, S-36L, S-38L, S-40L, S-42L, S-44L, S-46L and S-48L to S-51L for any crack.

CONDITION 5: NO

CRACK FOUND

DURING THE DE-

TAILED INSPECTION

Original Issue: September 21, 2022 747-53A2910 RB 8 of 108 REQUIREMENTS BULLETIN 747-53A2910

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Group 1:

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

CONDITION 6: ANY

CRACK FOUND

DURING THE DE-

TAILED INSPECTION

OF STRINGER AS- SEMBLIES S-18L TO S-25L, S-34L, S-36L, S-38L, S-40L, S-42L, S-44L, S-46L AND S- 48L TO S-51L 8,000 flight cycles or 8 years, whichever occurs first.

-CONDITION 6 (ACTION 2):

Repeat the detailed inspection of stringer assemblies S- 18L to S-25L, S-34L, S-36L, S-38L, S-40L, S-42L, S-44L, S-46L and S-48L to S-51L for any crack.

Group 1:

Table 2: Right side, Inspection of Stringers Forward of the Pressure Bulkhead at Body Station (STA) 2360 Repeat Interval (Not to Exceed) Boeing Recommended Compliance Time (Whichever Occurs Later) ActionCondition -Within 36 months after the Original Issue date of Requirements Bulletin 747-53A2910 RB.

ACTION 1: Do a LFEC inspection of stringer sidewalls and a detailed inspection of stringer assemblies S-3R to S-5R for any crack.

All Airplanes.

ACTION 2: Do a HFEC inspection of stringer sidewalls and a detailed inspection of stringer assemblies S-1R, S- 2R, S-6R to S-12R, S-14R, S-15R and S-17R for any crack.

ACTION 3: Do a detailed inspection of stringer assemblies S-18R to S-25R, S-34R, S-36R, S-38R, S-40R, S-42R, S-44R, S-46R and S-48R to S-51R for any crack.

Original Issue: September 21, 2022 747-53A2910 RB 9 of 108 REQUIREMENTS BULLETIN 747-53A2910

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Group 1:

Table 2: Right side, Inspection of Stringers Forward of the Pressure Bulkhead at Body Station (STA) 2360 Repeat Interval (Not to Exceed) Boeing Recommended Compliance Time (Whichever Occurs Later) ActionCondition 8,000 flight cycles or 8 years, whichever occurs first.

-Repeat the LFEC inspection of stringer sidewalls and the detailed inspection of stringer assemblies S-3R to S-5R for any crack.

CONDITION 7: NO

CRACK FOUND

DURING THE LFEC

INSPECTION OF

STRINGER SIDE-

WALLS AND THE

DETAILED INSPEC-

TION OF STRINGER ASSEMBLIES S-3R TO S-5R -Before further flight.CONDITION 8 (ACTION 1):

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

CONDITION 8: ANY

CRACK FOUND

DURING THE LFEC

INSPECTION OF

STRINGER SIDE-

WALLS OR THE DE-

TAILED INSPECTION

OF STRINGER AS- SEMBLIES S-3R TO S-5R 8,000 flight cycles or 8 years, whichever occurs first.

-CONDITION 8 (ACTION 2):

Repeat the LFEC inspection of stringer sidewalls and the detailed inspection of stringer assemblies S-3R to S-5R for any crack.

8,000 flight cycles or 8 years, whichever occurs first.

-Repeat the HFEC inspection of stringer sidewalls and the detailed inspection of stringer assemblies S-1R, S-2R, S-6R to S-12R, S-14R, S-15R and S-17R for any crack.

CONDITION 9: NO

CRACK FOUND

DURING THE HFEC

INSPECTION OF

STRINGER SIDE-

WALLS AND THE

DETAILED INSPEC-

Original Issue: September 21, 2022 747-53A2910 RB 10 of 108 REQUIREMENTS BULLETIN 747-53A2910

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Group 1:

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

CONDITION 10: ANY

CRACK FOUND

DURING THE HFEC

INSPECTION OF

STRINGER SIDE-

WALLS OR THE DE-

TAILED INSPECTION

OF STRINGER AS- SEMBLIES S-1R, S- 2R, S-6R TO S-12R, S-14R, S-15R AND S- 17R 8,000 flight cycles or 8 years, whichever occurs first.

-CONDITION 10 (ACTION 2):

Repeat the HFEC inspection of stringer sidewalls and the detailed inspection of stringer assemblies S-1R, S-2R, S-6R to S-12R, S-14R, S-15R and S-17R for any crack.

8,000 flight cycles or 8 years, whichever occurs first.

-Repeat the detailed inspection of stringer assemblies S- 18R to S-25R, S-34R, S-36R, S-38R, S-40R, S-42R, S-44R, S-46R and S-48R to S-51R for any crack.

CONDITION 11: NO

CRACK FOUND

DURING THE DE-

TAILED INSPECTION

OF STRINGER AS- SEMBLIES S-18R TO S-25R, S-34R, S-36R, S-38R, S-40R, S-42R, S-44R, S-46R AND S- 48R TO S-51R -Before further flight.CONDITION 12 (ACTION 1):

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

CONDITION 12: ANY

CRACK FOUND

DURING THE DE-

TAILED INSPECTION

OF STRINGER AS- SEMBLIES S-18R TO S-25R, S-34R, S-36R, S-38R, S-40R, S-42R, S-44R, S-46R AND S- 48R TO S-51R 8,000 flight cycles or 8 years, whichever occurs first.

-CONDITION 12 (ACTION 2):

Repeat the detailed inspection of stringer assemblies S- 18R to S-25R, S-34R, S-36R, S-38R, S-40R, S-42R, S-44R, S-46R and S-48R to S-51R for any crack.

Original Issue: September 21, 2022 747-53A2910 RB 11 of 108 REQUIREMENTS BULLETIN 747-53A2910

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Group 2:

Table 3: Left side, Inspection of Stringers Forward of the Pressure Bulkhead at Body Station (STA) 2360 Repeat Interval (Not to Exceed) Boeing Recommended Compliance Time (Whichever Occurs Later) ActionCondition -Within 36 months after the Original Issue date of Requirements Bulletin 747-53A2910 RB.

ACTION 1: Do a Low Frequency Eddy Current (LFEC) inspection of stringer sidewalls and a detailed inspection of stringer assemblies S- 3L to S-5L and S-13L to S- 17L for any crack.

All Airplanes.

ACTION 2: Do a High Frequency Eddy Current (HFEC) inspection of stringer sidewalls and a detailed inspection of stringer assemblies S- 1L, S-2L and S-6L to S-12L for any crack.

ACTION 3: Do a detailed inspection of stringer assemblies S-18L to S-25L, S-34L, S-36L, S-38L, S-40L, S-42L, S-44L, S-46L and S-48L to S- 51L for any crack.

8,000 flight cycles or 8 years, whichever occurs first.

-Repeat the LFEC inspection of stringer sidewalls and the detailed inspection of stringer assemblies S-3L to S-5L and S-13L to S-17L for any crack.

CONDITION 13: NO

CRACK FOUND

DURING THE LFEC

INSPECTION OF

STRINGER SIDE-

WALLS AND THE

DETAILED INSPEC-

TION OF STRINGER ASSEMBLIES S-3L TO S-5L AND S-13L TO S-17L -Before further flight.CONDITION 14 (ACTION 1):

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

CONDITION 14: ANY

CRACK FOUND

DURING THE LFEC

INSPECTION OF

STRINGER SIDE-

WALLS OR THE DE-

TAILED INSPECTION

OF STRINGER AS- SEMBLIES S-3L TO S-5L AND S-13L TO S-17L 8,000 flight cycles or 8 years, whichever occurs first.

-CONDITION 14 (ACTION 2):

Repeat the LFEC inspection of stringer sidewalls and the detailed inspection of stringer assemblies S-3L to S-5L and S-13L to S-17L for any crack.

Original Issue: September 21, 2022 747-53A2910 RB 12 of 108 REQUIREMENTS BULLETIN 747-53A2910

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