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Commercial Airplanes 737 Requirements Bulletin ALERT Number: 737-57A1337 RB Original Issue: September 14, 2017 ATA System: 5711 SUBJECT: WINGS - Wing Spars - Rear Spar Web, Upper and Lower Chord from Wing Buttock Line 91 to 155 - 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:
BOEING PROPRIETARY, CONFIDENTIAL AND/OR TRADE SECRET Copyright © 2017 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Unpublished Work.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: September 14, 2017 737-57A1337 RB 1 of 39
3.0
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 14, 2017 737-57A1337 RB 2 of 39 REQUIREMENTS BULLETIN 737-57A1337
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Table of Contents
1. EFFECTIVITY5
A. Airplanes5
B. Spares Affected5
2. CONCURRENT REQUIREMENTS5
3. COMPLIANCE5
4. APPROVAL11
5. ACCOMPLISHMENT INSTRUCTIONS13
A. General Information13
B. Work Instructions14
FIGURE 1: LEFT WING - WBL 149 TO WBL 152 - REAR SPAR WEB AND UPPER CHORD - DETAILED
INSPECTION (AREA 1) [Group 2]20
FIGURE 2: RIGHT WING - WBL 149 TO WBL 152 - REAR SPAR WEB AND UPPER CHORD - DETAILED
INSPECTION (AREA 1) [Group 2]22
FIGURE 3: LEFT WING - WBL 149 TO WBL 152 - REAR SPAR UPPER CHORD - SURFACE HFEC
INSPECTION (AREA 1) [Group 2]24
FIGURE 4: RIGHT WING - WBL 149 TO WBL 152 - REAR SPAR UPPER CHORD - SURFACE HFEC
INSPECTION (AREA 1) [Group 2]26
FIGURE 5: LEFT WING - WBL 91 TO WBL 155 - REAR SPAR WEB, UPPER AND LOWER CHORD -
DETAILED INSPECTION (AREA 2) [Group 2]28
FIGURE 6: RIGHT WING - WBL 91 TO WBL 155 - REAR SPAR WEB, UPPER AND LOWER CHORD -
DETAILED INSPECTION (AREA 2) [Group 2]31
FIGURE 7: LEFT WING - WBL 91 TO WBL 155 - REAR SPAR WEB, UPPER AND LOWER CHORD - SURFACE HFEC INSPECTION AND DETAILED INSPECTION (AREA 2) [Group 2] . . . 34 FIGURE 8: RIGHT WING - WBL 91 TO WBL 155 - REAR SPAR WEB, UPPER AND LOWER CHORD - SURFACE HFEC INSPECTION AND DETAILED INSPECTION (AREA 2) [Group 2] . . . 37 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 14, 2017 737-57A1337 RB 3 of 39 REQUIREMENTS BULLETIN 737-57A1337
ALERTALERT
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 14, 2017 737-57A1337 RB 4 of 39 REQUIREMENTS BULLETIN 737-57A1337
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Commercial Airplanes 737 Requirements Bulletin ALERT Number: 737-57A1337 RB Original Issue: September 14, 2017 ATA System: 5711 SUBJECT: WINGS - Wing Spars - Rear Spar Web, Upper and Lower Chord from Wing Buttock Line 91 to 155 - 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 service bulletin is applicable to all 737-100/200/200C/300/400/500 Airplanes.
DESCRIPTIONCONFIGURATIONGROUP 737-100/200/200C Airplanes, line numbers 1 thru 291.-1 737-200/200C/300/400/500 Airplanes, line numbers 292 thru 3132.-2 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 737-57A1337 RB. The Airworthiness Directive will make the compliance tasks and times given in Requirements Bulletin 737-57A1337 RB mandatory.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 14, 2017 737-57A1337 RB 5 of 39
Accomplish the required actions, based on the applicable conditions in Table 1 and Table 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 number or an OPTION number, do all of the ACTION numbers for that CONDITION number or OPTION number.
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: Detailed inspection or surface High Frequency Eddy Current (HFEC) inspection for any crack in the rear spar structure on the left and right wing from Wing Buttock Line (WBL) 149 to WBL 152 (Area
1) Repeat Interval (Not to Exceed) Compliance Time (Whichever Occurs Later) ActionCondition -Within 3,000 flight cycles after the original issue date of Requirements Bulletin 737- 57A1337 RB.
Before 45,000 total flight cycles.
OPTION 1: Do a detailed inspection of the rear spar web and upper chord on the left and right wing from WBL 149 to WBL 152 for any crack.
All Airplanes -Within 4,500 flight cycles after the original issue date of Requirements Bulletin 737- 57A1337 RB.
Before 45,000 total flight cycles.
OPTION 2: Do a surface HFEC inspection of the rear spar upper chord on the left and right wing from WBL 149 to WBL 152 for any crack.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 14, 2017 737-57A1337 RB 6 of 39 REQUIREMENTS BULLETIN 737-57A1337
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Group 2:
Table 1: Detailed inspection or surface High Frequency Eddy Current (HFEC) inspection for any crack in the rear spar structure on the left and right wing from Wing Buttock Line (WBL) 149 to WBL 152 (Area
1) Repeat Interval (Not to Exceed) Compliance Time (Whichever Occurs Later) ActionCondition -Before further flight.ACTION 1: Contact The Boeing Company for repair instructions and do the repair.
CONDITION 1: ANY
CRACK FOUND DURING OPTION 1 INSPECTION 3,000 flight cycles.
(b) -ACTION 2 (OPTION 1):
Repeat the detailed inspection of the rear spar web and upper chord on the left and right wing from WBL 149 to WBL 152 for any crack in unrepaired areas. (b)
(a)Within 3,000 flight cycles after the most recent OPTION 1 inspection was done.
ACTION 2 (OPTION 2):
Do a surface HFEC inspection of the rear spar upper chord on the left and right wing from WBL 149 to WBL 152 for any crack in unrepaired areas. (a) 3,000 flight cycles.
(b) -OPTION 1: Repeat the detailed inspection of the rear spar web and upper chord on the left and right wing from WBL 149 to WBL 152 for any crack.
(b) CONDITION 2: NO
CRACK FOUND DURING OPTION 1 INSPECTION
(a)Within 3,000 flight cycles after the most recent OPTION 1 inspection was done.
OPTION 2: Do a surface HFEC inspection of the rear spar upper chord on the left and right wing from WBL 149 to WBL 152 for any crack. (a) -Before further flight.Contact The Boeing Company for repair instructions and do the repair.
CONDITION 3: ANY
CRACK FOUND DURING OPTION 2 INSPECTION Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 14, 2017 737-57A1337 RB 7 of 39 REQUIREMENTS BULLETIN 737-57A1337
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Group 2:
Table 1: Detailed inspection or surface High Frequency Eddy Current (HFEC) inspection for any crack in the rear spar structure on the left and right wing from Wing Buttock Line (WBL) 149 to WBL 152 (Area
1) Repeat Interval (Not to Exceed) Compliance Time (Whichever Occurs Later) ActionCondition
(a)Within 4,500 flight cycles after the most recent OPTION 2 inspection was done.
OPTION 1: Do a detailed inspection of the rear spar web and upper chord on the left and right wing from WBL 149 to WBL 152 for any crack.
(a) CONDITION 4: NO
CRACK FOUND DURING OPTION 2 INSPECTION 4,500 flight cycles.
(b) -OPTION 2: Repeat the surface HFEC inspection of the rear spar upper chord on the left and right wing from WBL 149 to WBL 152 for any crack.
(b)
(a) This is not a terminating action. Refer to the applicable condition for further actions.
(b) It is acceptable to change the repeat action from this OPTION to any other OPTION under this CONDI- TION. The next OPTION must be done within the compliance time for the most recent OPTION.
Group 2:
Table 2: Detailed inspection, or surface HFEC inspection and detailed inspection, for any crack in the rear spar structure on the left and right wing from WBL 91 to WBL 155 (Area 2) Repeat Interval (Not to Exceed) Compliance Time (Whichever Occurs Later) ActionCondition -Within 3,000 flight cycles after the original issue date of Requirements Bulletin 737- 57A1337 RB.
Before 45,000 total flight cycles.
OPTION 1: Do a detailed inspection of the rear spar web and the upper and lower chord on the left and right wing from WBL 91 to WBL 155 for any crack.
All Airplanes -Within 4,500 flight cycles after the original issue date of Requirements Bulletin 737- 57A1337 RB.
Before 45,000 total flight cycles.
OPTION 2: Do a surface HFEC inspection of the rear spar web, and a detailed inspection of the upper and lower chord, on the left and right wing from WBL 91 to WBL 155 for any crack.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 14, 2017 737-57A1337 RB 8 of 39 REQUIREMENTS BULLETIN 737-57A1337
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Group 2:
Table 2: Detailed inspection, or surface HFEC inspection and detailed inspection, for any crack in the rear spar structure on the left and right wing from WBL 91 to WBL 155 (Area 2) Repeat Interval (Not to Exceed) Compliance Time (Whichever Occurs Later) ActionCondition -Before further flight.ACTION 1: Contact The Boeing Company for repair instructions and do the repair.
CONDITION 5: ANY
CRACK FOUND DURING OPTION 1 INSPECTION 3,000 flight cycles.
(b) -ACTION 2 (OPTION 1):
Repeat the detailed inspection of the rear spar web and the upper and lower chord on the left and right wing from WBL 91 to WBL 155 for any crack in unrepaired areas. (b)
(a)Within 3,000 flight cycles after the most recent OPTION 1 inspection was done.
ACTION 2 (OPTION 2):
Do a surface HFEC inspection of the rear spar web, and a detailed inspection of the upper and lower chord, on the left and right wing from WBL 91 to WBL 155 for any crack in unrepaired areas. (a) 3,000 flight cycles.
(b) -OPTION 1: Repeat the detailed inspection of the rear spar web and the upper and lower chord on the left and right wing from WBL 91 to WBL 155 for any crack. (b) CONDITION 6: NO
CRACK FOUND DURING OPTION 1 INSPECTION
(a)Within 3,000 flight cycles after the most recent OPTION 1 inspection was done.
OPTION 2: Do a surface HFEC inspection of the rear spar web, and a detailed inspection of the upper and lower chord, on the left and right wing from WBL 91 to WBL 155 for any crack. (a) Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 14, 2017 737-57A1337 RB 9 of 39 REQUIREMENTS BULLETIN 737-57A1337
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Group 2:
Table 2: Detailed inspection, or surface HFEC inspection and detailed inspection, for any crack in the rear spar structure on the left and right wing from WBL 91 to WBL 155 (Area 2) Repeat Interval (Not to Exceed) Compliance Time (Whichever Occurs Later) ActionCondition -Before further flight.ACTION 1: Contact The Boeing Company for repair instructions and do the repair.
CONDITION 7: ANY
CRACK FOUND DURING OPTION 2 INSPECTION
(a)Within 4,500 flight cycles after the most recent OPTION 2 inspection was done.
ACTION 2 (OPTION 1):
Do a detailed inspection of the rear spar web and the upper and lower chord on the left and right wing from WBL 91 to WBL 155 for any crack in unrepaired areas. (a) 4,500 flight cycles.
(b) -ACTION 2 (OPTION 2):
Repeat the surface HFEC inspection of the rear spar web, and the detailed inspection of the upper and lower chord, on the left and right wing from WBL 91 to WBL 155 for any crack in unrepaired areas. (b)
(a)Within 4,500 flight cycles after the most recent OPTION 2 inspection was done.
OPTION 1: Do a detailed inspection of the rear spar web and the upper and lower chord on the left and right wing from WBL 91 to WBL 155 for any crack. (a) CONDITION 8: NO
CRACK FOUND DURING OPTION 2 INSPECTION 4,500 flight cycles.
(b) -OPTION 2: Repeat the surface HFEC inspection of the rear spar web, and the detailed inspection of the upper and lower chord, on the left and right wing from WBL 91 to WBL 155 for any crack.
(b)
(a) This is not a terminating action. Refer to the applicable condition for further actions.
(b) It is acceptable to change the repeat action from this OPTION to any other OPTION under this CONDI- TION. The next OPTION must be done within the compliance time for the most recent OPTION.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 14, 2017 737-57A1337 RB 10 of 39 REQUIREMENTS BULLETIN 737-57A1337
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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.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 14, 2017 737-57A1337 RB 11 of 39 REQUIREMENTS BULLETIN 737-57A1337
ALERTALERT
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 14, 2017 737-57A1337 RB 12 of 39 REQUIREMENTS BULLETIN 737-57A1337