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Commercial Airplanes 757 Requirements Bulletin ALERT Number: 757-57A0075 RB Original Issue: August 25, 2021 ATA System: 5710 SUBJECT: WINGS - Center Wing - Rear Spar on Lower Wing Skin - Inspection 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:
Copyright © 2021 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Unpublished Work.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: August 25, 2021 757-57A0075 RB 1 of 32
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Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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Table of Contents
1. EFFECTIVITY5
A. Airplanes5
B. Spares Affected6
2. CONCURRENT REQUIREMENTS6
3. COMPLIANCE7
4. APPROVAL12
5. ACCOMPLISHMENT INSTRUCTIONS13
A. General Information13
B. Work Instructions14
FIGURE 1: CENTER WING BOX - REAR SPAR, LOWER SKIN AND LOWER CHORD - OPTION 1
SURFACE HFEC INSPECTION20
FIGURE 2: CENTER WING BOX - REAR SPAR, LOWER SKIN AND LOWER CHORD - OPTION 2
DETAILED INSPECTION23
FIGURE 3: CENTER WING BOX - REAR SPAR, LOWER SKIN AND LOWER CHORD - INTERNAL
ULTRASONIC AND DETAIL INSPECTION26
FIGURE 4: CENTER WING BOX - REAR SPAR, LOWER SKIN AND LOWER CHORD - INTERNAL
DETAILED INSPECTION30
Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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Commercial Airplanes 757 Requirements Bulletin ALERT Number: 757-57A0075 RB Original Issue: August 25, 2021 ATA System: 5710 SUBJECT: WINGS - Center Wing - Rear Spar on Lower Wing Skin - Inspection
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 757-200, 757-200CB, 757-200PF, 757-300 Airplane(s), line number(s) 1-1050 in 1 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.
DESCRIPTIONCONFIGURATIONGROUP 757-200, 757-200CB, 757-200PF, 757-300 Airplanes-1 Airplane Models:
757-200, 757-200CB, 757-200PF, 757-300 GroupVariable Number 1NA001 - NA028 1NA191 - NA199 1NA201 - NA239 1NA301 - NA305 1NA341 - NA352 1NA391 - NA399 GroupVariable Number 1NA401 - NA408 1NA441 - NA447 1NA501 - NA586 1NB001 - NB004 1NB021 - NB023 1NB036 - NB041 GroupVariable Number 1NB051 - NB053 1NB061 - NB073 1NB079 1NB131 - NB148 1NB161 - NB162 1NB166 - NB168 Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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GroupVariable Number 1NB201 - NB204 1NB221 - NB228 1NB230 1NB236 1NB239 1NB261 - NB267 1NB291 - NB299 1NB301 - NB302 1NB311 - NB312 1NB321 - NB331 1NB421 - NB438 1NB446 1NB451 - NB454 1NB501 - NB523 1NB561 1NB571 1NB581 - NB583 1NC001 - NC033 1NC041 - NC042 1NC051 - NC052 1NC056 - NC062 1NC066 - NC084 1NC091 - NC094 1NC151 1NC161 1NC901 - NC951 1NC971 - NC974 1ND001 - ND007 1ND011 - ND059 GroupVariable Number 1ND111 - ND113 1ND161 - ND199 1ND201 - ND203 1ND221 - ND225 1ND241 - ND248 1ND301 - ND322 1ND401 1ND891 1ND895 1NE001 - NE008 1NE011 - NE088 1NE091 - NE094 1NE141 - NE150 1NE161 - NE177 1NE201 - NE204 1NE301 - NE302 1NE311 - NE325 1NJ001 - NJ004 1NJ031 - NJ032 1NJ551 - NJ555 1NL001 - NL002 1NL006 - NL017 1NL101 - NL109 1NL141 1NL601 - NL616 1NN001 - NN002 1NN051 - NN052 1NP901 - NP904 1NS601 - NS616 GroupVariable Number 1NT001 - NT009 1NT201 - NT202 1NT231 - NT234 1NT237 - NT240 1NT242 1NT245 - NT248 1NT281 - NT289 1NT341 - NT347 1NT351 - NT360 1NT371 - NT373 1NT375 - NT379 1NT381 - NT386 1NT401 - NT409 1NT411 - NT412 1NT426 - NT427 1NT431 - NT432 1NT436 - NT438 1NT441 - NT442 1NT446 1NT701 - NT769 1NT791 - NT796 1NT861 - NT862 1NT881 - NT885 1NT901 - NT916 1NT971 - NT985 1NU031 - NU038 1NU701 - NU705 1NU721 - NU728 1NU731 - NU732 B. Spares Affected None.
2. CONCURRENT REQUIREMENTS None.
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3. COMPLIANCE The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to Requirements Bulletin 757-57A0075 RB. The Airworthiness Directive will make the compliance tasks and times given in Requirements Bulletin 757-57A0075 RB mandatory.
Accomplish the required actions, based on the applicable conditions in Table 1, Table 2 and Table 3 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.
Table 1: External or Internal Inspections of the Center Wing Box Lower Skin and Rear Spar Lower Chord Repeat Interval (Not to Exceed) Compliance Time (Whichever Occurs Later) ActionCondition -Within 4,000 flight cycles after the original issue date of Requirements Bulletin 757- 57A0075 RB.
Before 25,000 total flight cycles.
OPTION 1: Do an external High Frequency Eddy Current (HFEC) inspection of the center wing box lower skin and rear spar lower chord for any crack.
All Airplanes.
OPTION 2: Do an internal detailed inspection of the center wing box lower skin and rear spar lower chord for any crack.
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Table 1: External or Internal Inspections of the Center Wing Box Lower Skin and Rear Spar Lower Chord Repeat Interval (Not to Exceed) Compliance Time (Whichever Occurs Later) ActionCondition -Before further flight.CONDITION 1 (ACTION
1): Contact The Boeing Company for repair instructions and do the repair.
CONDITION 1: ANY
CRACK FOUND DURING OPTION 1 INSPECTION.
4,000 flight cycles.-CONDITION 1 ACTION 2 (OPTION 1): Repeat external High Frequency Eddy Current (HFEC) inspection of the center wing box lower skin and rear spar lower chord for any crack at the unrepaired areas.(a)(b) -Within 4,000 flight cycles after the most recent OPTION 1 inspection was done.
CONDITION 1 ACTION 2 (OPTION 2): Do an internal detailed inspection of the center wing box lower skin and rear spar lower chord for any crack at the unrepaired areas.(a)(b) 4,000 flight cycles.-CONDITION 2 (OPTION
1): Repeat external High Frequency Eddy Current (HFEC) inspection of the center wing box lower skin and rear spar lower chord for any crack.(a)(b) CONDITION 2: NO
CRACK FOUND DURING OPTION 1 INSPECTION.
-Within 4,000 flight cycles after the most recent OPTION 1 inspection was done.
CONDITION 2 (OPTION
2): Do an internal detailed inspection of the center wing box lower skin and rear spar lower chord for any crack.(a)(b) Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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Table 1: External or Internal Inspections of the Center Wing Box Lower Skin and Rear Spar Lower Chord Repeat Interval (Not to Exceed) Compliance Time (Whichever Occurs Later) ActionCondition -Before further flight.CONDITION 3 (ACTION
1): Contact The Boeing Company for repair instructions and do the repair.
CONDITION 3: ANY
CRACK FOUND DURING OPTION 2 INSPECTION.
-Within 6,000 flight cycles after the most recent OPTION 2 inspection was done.
CONDITION 3 ACTION 2 (OPTION 1): Do an external High Frequency Eddy Current (HFEC) inspection of the center wing box lower skin and rear spar lower chord for any crack at the unrepaired areas.(a)(b) 6,000 flight cycles.-CONDITION 3 ACTION 2 (OPTION 2): Repeat internal detailed inspection of the center wing box lower skin and rear spar lower chord for any crack at the unrepaired areas.(a)(b) -Within 6,000 flight cycles after the most recent OPTION 2 inspection was done.
CONDITION 4 (OPTION
1): Do an external High Frequency Eddy Current (HFEC) inspection of the center wing box lower skin and rear spar lower chord for any crack.(a)(b) CONDITION 4: NO
CRACK FOUND DURING OPTION 2 INSPECTION.
6,000 flight cycles.-CONDITION 4 (OPTION
2): Repeat internal detailed inspection of the center wing box lower skin and rear spar lower chord for any crack.(a)(b)
(a) After the accomplishment of this OPTION, it is acceptable to change the repeat action from this OPTION to any other OPTION under this CONDITION.
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Table 1: External or Internal Inspections of the Center Wing Box Lower Skin and Rear Spar Lower Chord Repeat Interval (Not to Exceed) Compliance Time (Whichever Occurs Later) ActionCondition
(b) It is not required to do the inspection in areas where a repair covers the affected inspection area if the repair meets the conditions that follow:
1. The repair is the corrective action to the crack condition identified in Requirements Bulletin 757-57A0075 RB and installed after the original issue date of Requirements Bulletin 757-57A0075 RB.
2. The installed repair was approved by the Boeing Organization Designation Authorization (ODA) via a FAA Form 8100-9.
Table 2: Internal Ultrasonic Inspection of the Center Wing Box Lower Chord and Detailed Inspection of the Lower Skin at the Rear Spar Repeat Interval (Not to Exceed) Compliance Time (Whichever Occurs Later) ActionCondition -Within 4,000 flight cycles after the original issue date of Requirements Bulletin 757- 57A0075 RB.
The compliance times given in 1., 2., and 3., whichever occurs first:
1. Before 120,000 total flight hours.
2. Before 50,000 total flight cycles.
3. Before the result of 80000-(0.5 X
TFH) - TFC is less than or equal to zero.
TFC = Total Flight Cycles Do an internal ultrasonic inspection of the center wing box lower chord and detailed inspection of the lower skin at the rear spar for any crack.
All Airplanes.
TFH = Total Flight Hours Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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Table 2: Internal Ultrasonic Inspection of the Center Wing Box Lower Chord and Detailed Inspection of the Lower Skin at the Rear Spar Repeat Interval (Not to Exceed) Compliance Time (Whichever Occurs Later) ActionCondition -Before further flight.CONDITION 5 (AC- TION 1): Contact The Boeing Company for repair instructions and do the repair.
CONDITION 5: ANY CRACK FOUND.
12,000 flight cycles.
-CONDITION 5 (AC- TION 2): Repeat internal ultrasonic inspection of the center wing box lower chord and detailed inspection of the lower skin at the rear spar for any crack at the unrepaired areas.(a) 12,000 flight cycles.
-CONDITION 2: Repeat internal ultrasonic inspection of the center wing box lower chord and detailed inspection of the lower skin at the rear spar for any crack.(a) CONDITION 6: NO CRACK FOUND.
(a) It is not required to do the inspection in areas where a repair covers the affected inspection area if the repair meets the conditions that follow:
1. The repair is the corrective action to the crack condition identified in Requirements Bulletin 757-57A0075 RB and installed after the original issue date of Requirements Bulletin 757-57A0075 RB.
2. The installed repair was approved by the Boeing Organization Designation Authorization (ODA) via a FAA Form 8100-9.
Table 3: Internal Detailed Inspection of the Center Wing Box Lower Skin and Rear Spar Lower Chord Repeat Interval (Not to Exceed) Compliance Time (Whichever Occurs Later) ActionCondition -Within 4,000 flight cycles after the original issue date of Requirements Bulletin 757- 57A0075 RB.
Before 50,000 total flight cycles.
Do an internal detailed inspection of the center wing box lower skin and rear spar lower chord for any crack.
All Airplanes.
Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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Table 3: Internal Detailed Inspection of the Center Wing Box Lower Skin and Rear Spar Lower Chord Repeat Interval (Not to Exceed) Compliance Time (Whichever Occurs Later) ActionCondition -Before further flight.CONDITION 7 (ACTION
1): Contact The Boeing Company for repair instructions and do the repair.
CONDITION 7: ANY CRACK FOUND.
12,000 flight cycles.
-CONDITION 7 (ACTION
2): Repeat internal detailed inspection of the center wing box lower skin and rear spar lower chord for any crack at the unrepaired areas.(a) 12,000 flight cycles.
-CONDITION 2: Repeat internal detailed inspection of the center wing box lower skin and rear spar lower chord for any crack.(a) CONDITION 8: NO CRACK FOUND.
(a) It is not required to do the inspection in areas where a repair covers the affected inspection area if the repair meets the conditions that follow:
1. The repair is the corrective action to the crack condition identified in Requirements Bulletin 757-57A0075 RB and installed after the original issue date of Requirements Bulletin 757-57A0075 RB.
2. The installed repair was approved by the Boeing Organization Designation Authorization (ODA) via a FAA Form 8100-9.
4. APPROVAL This Requirements Bulletin was examined by the Federal Aviation Administration (FAA). The changes specified in this document comply with the applicable regulations and are FAA approved, as well as European Union Aviation Safety Agency (EASA)/Joint Aviation Authorities (JAA) approved for all EASA/JAA approved airplanes listed in this Requirements Bulletin effectivity. This document and its approval were based on the airplane in its original Boeing delivery configuration or as modified by other Boeing changes.
If an airplane has a non-Boeing modification or repair that affects a component or system also affected by this Requirements Bulletin, the operator is responsible for obtaining appropriate regulatory agency approval before incorporating this Requirements Bulletin.
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