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Commercial Airplanes 737 Requirements Bulletin ALERT Number: 737-57A1344 RB Original Issue: February 18, 2019 ATA System: 5730 SUBJECT: WINGS - Plates/Skin - Inspection of Upper Skin at Wing Buttock Line 157 Between Stringer 4 and 5 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 © 2019 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Unpublished Work.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: February 18, 2019 737-57A1344 RB 1 of 15
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Table of Contents
1. EFFECTIVITY5
A. Airplanes5
B. Spares Affected5
2. CONCURRENT REQUIREMENTS5
3. COMPLIANCE6
4. APPROVAL8
5. ACCOMPLISHMENT INSTRUCTIONS9
A. General Information9
B. Work Instructions10
FIGURE 1: LEFT UPPER WING SKIN - SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC) AND
GENERAL VISUAL INSPECTION [Group 2-3]12
FIGURE 2: RIGHT UPPER WING SKIN - SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC) AND
GENERAL VISUAL INSPECTION [Group 2-3]14
Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.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Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.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 737 Requirements Bulletin ALERT Number: 737-57A1344 RB Original Issue: February 18, 2019 ATA System: 5730 SUBJECT: WINGS - Plates/Skin - Inspection of Upper Skin at Wing Buttock Line 157 Between Stringer 4 and 5
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 737-100, 737-200, 737-200C, 737-300, 737-400, 737-500 Airplane(s), line number(s) 1-3132 in 3 Group(s).
DESCRIPTIONCONFIGURATIONGROUP 737-100, 737-200, 737-200C, Airplane with line numbers 1-291.-1 737-200, 737-200C, Airplane with line numbers 292-1585.-2 737-300, 737-400, 737-500, Airplane with line numbers 1001-3132.-3 B. Spares Affected None.
2. CONCURRENT REQUIREMENTS None.
Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 18, 2019 737-57A1344 RB 5 of 15
3. COMPLIANCE The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to Requirements Bulletin 737-57A1344 RB. The Airworthiness Directive will make the compliance tasks and times given in Requirements Bulletin 737-57A1344 RB mandatory.
Accomplish the required actions, based on the applicable conditions in Tables 1 and 2 in accordance with the 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:
Boeing endorses the FAA rules related to Limit of Validity (LOV) and recommends immediate and permanent removal from service of any airplanes upon reaching the LOV, whether or not it is operated under FAA jurisdiction. As such, Boeing no longer provides maintenance instructions for airplanes that have accumulated flight cycles beyond the LOV. Airplanes in Group 1 (line numbers 1-291) have accumulated flight cycles beyond the LOV of the maintenance program. 14 CFR 121.1115 and 129.115 prohibit operation of an airplane beyond its LOV.
Group 2:
Table 1: Surface High Frequency Eddy Current (HFEC) and general visual inspection of the upper wing skin.
Repeat Interval (Not to Exceed) Compliance Time (Whichever Occurs Later) ActionCondition -Within 2,000 flight cycles after the original issue date of Requirements Bulletin 737- 57A1344 RB.
Before 30,000 total flight cycles.
Do a surface HFEC inspection of the upper wing skin at WBL 157, between stringer 4 and stringer 5, and a general visual inspection of the upper wing skin in the adjacent rib bay areas for any crack.
All Airplanes -Before further flight.ACTION 1: Contact The Boeing Company for repair instructions and do the repair.
CONDITION 1: ANY
CRACK FOUND 2,000 flight cycles.-ACTION 2: Repeat the surface HFEC inspection of the upper wing skin at WBL 157, between stringer 4 and stringer 5, and general visual inspection of the upper wing skin in the adjacent rib bay areas for any crack in the unrepaired area.
Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 18, 2019 737-57A1344 RB 6 of 15 REQUIREMENTS BULLETIN 737-57A1344
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Group 2:
Table 1: Surface High Frequency Eddy Current (HFEC) and general visual inspection of the upper wing skin.
Repeat Interval (Not to Exceed) Compliance Time (Whichever Occurs Later) ActionCondition 2,000 flight cycles.-Repeat the surface HFEC inspection of the upper wing skin at WBL 157, between stringer 4 and stringer 5, and general visual inspection of the upper wing skin in the adjacent rib bay areas for any crack.
CONDITION 2: NO
CRACK FOUND Group 3:
Table 2: Surface High Frequency Eddy Current (HFEC) and general visual inspection of the upper wing skin.
Repeat Interval (Not to Exceed) Compliance Time (Whichever Occurs Later) ActionCondition -Within 4,500 flight cycles after the original issue date of Requirements Bulletin 737- 57A1344 RB.
Before 30,000 total flight cycles.
Do a surface HFEC inspection of the upper wing skin at WBL 157, between stringer 4 and stringer 5, and a general visual inspection of the upper wing skin in the adjacent rib bay areas for any crack.
All Airplanes -Before further flight.ACTION 1: Contact The Boeing Company for repair instructions and do the repair.
CONDITION 1: ANY
CRACK FOUND 4,500 flight cycles.-ACTION 2: Repeat the surface HFEC inspection of the upper wing skin at WBL 157, between stringer 4 and stringer 5, and general visual inspection of the upper wing skin in the adjacent rib bay areas for any crack in the unrepaired area.
4,500 flight cycles.-Repeat the surface HFEC inspection of the upper wing skin at WBL 157, between stringer 4 and stringer 5, and general visual inspection of the upper wing skin in the adjacent rib bay areas for any crack.
CONDITION 2: NO
CRACK FOUND Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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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 Aviation Safety Agency (EASA)/Joint Aviation Authorities (JAA) approved for all EASA/JAA approved airplanes listed in the service 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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Original Issue: February 18, 2019 737-57A1344 RB 8 of 15 REQUIREMENTS BULLETIN 737-57A1344
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5. ACCOMPLISHMENT INSTRUCTIONS A. GENERAL INFORMATION NOTE: 1. This is an Enhanced Required for Compliance document. There will be a separate Service Bulletin (SB) and a separate Requirements Bulletin (RB). If an RB is mandated by an Airworthiness Directive (AD), then all applicable requirements specified in the RB must be done. For the related SB, some locations are marked RC Start and RC End to identify the requirements that are restated from the RB. For the related SB, the areas between RC Start and RC End, including sub-steps and any figures identified between RC Start and RC End, must be done to comply with the AD.
Therefore, an Alternative Method of Compliance (AMOC) is required for any deviations to steps between RC Start and RC End, including substeps and identified figures.
For the related SB, the steps not between RC Start and RC End may be deviated from using accepted methods in accordance with the operator's maintenance or inspection program without obtaining approval of an AMOC; this is provided that the steps between RC Start and RC End, including sub-steps and identified figures, can still be done as specified, and the airplane can be put back in an airworthy condition.
Figures not required for compliance are omitted from the RB.
2. 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.
3. The compliance times for the actions in WORK INSTRUCTIONS are in Compliance.
4. Boeing Service Letter 737-SL-51-042, Damage Reporting and Repair Plan/Design Guidelines, is an acceptable procedure to request information from Boeing for additional structural repair instructions. The Service Letter describes what information must be provided to Boeing before a structural repair can be provided.
5. Unless shown differently, these dimensions and tolerances are used:
– Linear dimensions are in inches – Tolerance on linear dimensions, other than rivet and bolt edge margins, is plus or minus 0.03 inch – Tolerance on rivet and bolt edge margin is plus or minus 0.05 inch – Angular tolerance is plus or minus 2 degrees – Hole dimensions for standard solid rivets and fasteners are in Structural Repair Manual (SRM) Chapter 51 – Torque Values:
— Values for structural fasteners are given in 737 Structural Repair Manual, Chapter 51.
— Values for airframe maintenance tasks are included in Chapter 20 of 737 Aircraft Maintenance Manual (AMM).
— Values for electrical maintenance tasks are included in Chapter 20 of Standard Wiring Practices Manual (SWPM).
— Values for engine maintenance tasks are included in Chapter 70 of 737 Aircraft Maintenance Manual (AMM).
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— Non-standard torque values for maintenance tasks are included in the applicable installation step.
6. These work instructions refer to procedures included in 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.
7. If it is necessary to remove more parts for access, you can remove those parts. If you can get access without removing identified parts, it is not necessary to remove all of the identified parts. Jacking and shoring limitations must be observed.
8. A General Visual Inspection is defined as: A visual examination of an interior or exterior area, installation or assembly to detect obvious damage, failure or irregularity.
This level of inspection is made from within touching distance, unless otherwise specified. A mirror may be necessary to enhance visual access to all exposed surfaces in the inspection area. This level of inspection is made under normally available lighting conditions such as daylight, hangar lighting, flashlight or drop-light and may require removal or opening of access panels or doors. Stands, ladders or platforms may be required to gain proximity to the area being checked. Basic cleaning may be required to ensure appropriate visibility.
9. 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.
B. WORK INSTRUCTIONS Actions Required for Compliance
1. Requirements Group 1:
Boeing endorses the FAA rules related to Limit of Validity (LOV) and recommends immediate and permanent removal from service of any airplanes upon reaching the LOV, whether or not it is operated under FAA jurisdiction. As such, Boeing no longer provides maintenance instructions for airplanes that have accumulated flight cycles beyond the LOV. Airplanes in Group 1 (line numbers 1-291) have accumulated flight cycles beyond the LOV of the maintenance program. 14 CFR
121.1115 and 129.115 prohibit operation of an airplane beyond its LOV.
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Original Issue: February 18, 2019 737-57A1344 RB 10 of 15 REQUIREMENTS BULLETIN 737-57A1344
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Group 2-3:
Table 1: Surface High Frequency Eddy Current (HFEC) and general visual inspection of the upper wing skin.
Refer to the listed procedures in SB 737-57A1344 Original Issue or later approved revisions as an accepted procedure.
Method of Compliance ActionCondition -FIGURE 1Do a surface HFEC inspection of the upper wing skin at WBL 157, between stringer 4 and stringer 5, and a general visual inspection of the upper wing skin in the adjacent rib bay areas for any crack.
All Airplanes FIGURE 2 --ACTION 1: Contact The Boeing Company for repair instructions and do the repair.
CONDITION 1: ANY
CRACK FOUND -FIGURE 1ACTION 2: Repeat the surface HFEC inspection of the upper wing skin at WBL 157, between stringer 4 and stringer 5, and general visual inspection of the upper wing skin in the adjacent rib bay areas for any crack in the unrepaired area.
FIGURE 2 -FIGURE 1Repeat the surface HFEC inspection of the upper wing skin at WBL 157, between stringer 4 and stringer 5, and general visual inspection of the upper wing skin in the adjacent rib bay areas for any crack.
CONDITION 2: NO CRACK FOUND FIGURE 2 Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 18, 2019 737-57A1344 RB 11 of 15 REQUIREMENTS BULLETIN 737-57A1344
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REQUIREMENTS BULLETIN 737-57A1344
ALERT ALERT This Figure applies only to: Group 2-3.
WBL
135.50 _S-6 WBL _S-5
157.00 DRY . S-4 BAY WBL . S-3
183.40 777 3 1 30 13) + 39 39
REAR SPAR 17 IBD
GENERAL VISUAL
INSPECTION AREA HFEC INSPECTION AREA A-A 2849641 FIGURE 1: LEFT UPPER WING SKIN - SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC) AND
GENERAL VISUAL INSPECTION (SHEET 1 OF 2) Original Issue: February 18, 2019 Export Controlled ECCN: 9E991 Copyright © Unpublished 737-57A1344 RB Work - See page 1 for details. 12 of 15