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Commercial Airplanes 737 Service Bulletin ALERT Number: 737-53A1361 Original Issue: July 17, 2018 ATA System: 5311 SUBJECT: FUSELAGE - Frames and Bulkheads - Section 43 Lower Lobe Frames from STA 380 to STA 520, 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 © 2018 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Unpublished Work.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: July 17, 2018 737-53A1361 1 of 133
3.0
Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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Table of Contents
S u m m a r y5
1. PLANNING INFORMATION9
A . E f f e c t i v i t y9
1. Airplanes9
2 . S p a r e s A f f e c t e d ........................................ 1 9 B. Concurrent Requirements ...................................... 1 9 C. Reason ................................................ 1 9 D. Description .............................................. 2 0 E. Compliance .............................................. 2 1 F . A p p r o v a l ............................................... 2 6 G. Manpower .............................................. 2 6 H. Weight and Balance Changes .................................... 2 8 I. Electrical Load Data ......................................... 2 8 J . R e f e r e n c e s .............................................. 2 8
1. Existing Data: ......................................... 2 8
2. Data Supplied with this Service Bulletin: ........................... 2 9
3. Installation Drawings Used in the Preparation of this Service Bulletin: ........... 2 9 K. Publications Affected ........................................ 3 0 L. Interchangeability and Intermixability of Parts ........................... 3 0 M. Software Accomplishment Summary ................................ 3 0
2. MATERIAL INFORMATION ........................................ 3 1 A. Material - Price and Availability ................................... 3 1 B. Industry Support Information .................................... 3 1 C. Parts Necessary for Each Airplane ................................. 3 1 1 . K i t s / P a r t s ............................................ 3 1
2. Parts and Materials Supplied by the Operator ........................ 3 1
3. Parts Modified and Reidentified ................................ 3 1
4. Parts Removed and Not Replaced .............................. 3 1 D. Parts Necessary to Change Spares ................................. 3 1 E. Special Tooling - Price and Availability ............................... 3 1 F. Special Tooling Necessary to do this Service Bulletin ....................... 3 1
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 3 3 A. GENERAL INFORMATION ..................................... 3 3 B. WORK INSTRUCTIONS ....................................... 3 5 FIGURE 1: LOWER LOBE FRAMES FROM STA 380 TO STA 520 LEFT SIDE - INSPECTION [Group 2] .................................................. 4 8 FIGURE 2: LOWER LOBE FRAMES FROM STA 380 TO STA 520 RIGHT SIDE - INSPECTION [Group 2] .................................................. 5 0 FIGURE 3: LOWER LOBE FRAMES FROM STA 380 TO STA 520 LEFT SIDE - INSPECTION [Group 3] .................................................. 5 2 FIGURE 4: LOWER LOBE FRAMES FROM STA 380 TO STA 520 RIGHT SIDE - INSPECTION [Group 3] .................................................. 5 4 FIGURE 5: LOWER LOBE FRAMES FROM STA 380 TO STA 520 LEFT SIDE - INSPECTION [Group 4] .................................................. 5 6 FIGURE 6: LOWER LOBE FRAMES FROM STA 380 TO STA 520 RIGHT SIDE - INSPECTION [Group 4] .................................................. 5 9 Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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FIGURE 7: LOWER LOBE FRAMES FROM STA 380 TO STA 520 LEFT SIDE - INSPECTION [Group 5] .................................................. 6 2 FIGURE 8: LOWER LOBE FRAMES FROM STA 380 TO STA 520 RIGHT SIDE - INSPECTION [Group 5] .................................................. 6 5 FIGURE 9: LOWER LOBE FRAMES FROM STA 380 TO STA 520 LEFT SIDE - INSPECTION [Group 6] .................................................. 6 8 FIGURE 10: LOWER LOBE FRAMES FROM STA 380 TO STA 520 RIGHT SIDE - INSPECTION [Group 6] .................................................. 7 0 FIGURE 11: LOWER LOBE FRAMES FROM STA 380 TO STA 520 LEFT SIDE - INSPECTION [Group 2] .................................................. 7 2 FIGURE 12: LOWER LOBE FRAMES FROM STA 380 TO STA 520 RIGHT SIDE - INSPECTION [Group 2] .................................................. 7 6 FIGURE 13: LOWER LOBE FRAMES FROM STA 380 TO STA 520 LEFT SIDE - INSPECTION [Group 3] .................................................. 7 9 FIGURE 14: LOWER LOBE FRAMES FROM STA 380 TO STA 520 RIGHT SIDE - INSPECTION [Group 3] .................................................. 8 5 FIGURE 15: LOWER LOBE FRAMES FROM STA 380 TO STA 520 LEFT SIDE - INSPECTION [Group 4] .................................................. 8 8 FIGURE 16: LOWER LOBE FRAMES FROM STA 380 TO STA 520 RIGHT SIDE - INSPECTION [Group 4] .................................................. 9 2 FIGURE 17: LOWER LOBE FRAMES FROM STA 380 TO STA 520 LEFT SIDE - INSPECTION [Group 5] .................................................. 9 5 FIGURE 18: LOWER LOBE FRAMES FROM STA 380 TO STA 520 RIGHT SIDE - INSPECTION [Group 5] .................................................. 9 9 FIGURE 19: LOWER LOBE FRAMES FROM STA 380 TO STA 520 LEFT SIDE - INSPECTION [Group 6] ................................................. 1 0 2 FIGURE 20: LOWER LOBE FRAMES FROM STA 380 TO STA 520 RIGHT SIDE - INSPECTION [Group 6] ................................................. 1 0 6 FIGURE 21: LOWER LOBE FRAME AT STA 380 INTEGRAL INBOARD CHORD AN D WEB LEFT SIDE - INSPECTION [Group 2, 4-5] ................................. 1 0 9 FIGURE 22: LOWER LOBE FRAME AT STA 380 INTEGRAL INBOARD CHORD AN D WEB RIGHT SIDE - INSPECTION [Group 2, 4-5] ................................. 1 1 3 FIGURE 23: LOWER LOBE FRAME AT STA 380 INTEGRAL INBOARD CHORD AN D WEB LEFT SIDE - INSPECTION [Group 6] .................................... 1 1 6 FIGURE 24: LOWER LOBE FRAME AT STA 380 INTEGRAL INBOARD CHORD AN D WEB RIGHT SIDE - INSPECTION [Group 6] .................................... 1 2 0 APPENDIX A: LOGIC DIAGRAM TABLE 2: INSPECTIONS OF THE SECTION 43 LOWER LOBE FRAMES FROM STA 380 TO STA 520, LEFT AND RIGHT SIDE [Group 2-6] ........... 1 2 3 APPENDIX B: LOGIC DIAGRAM TABLE 3: HIGH FREQUENCY EDDY CURRENT INSPECTIONS OF THE SECTION 43 LOWER LOBE FRAMES FROM STA 380 TO STA 520, LEFT AND RIGHT SIDE [Group 2-6] .......................................... 1 2 5 APPENDIX C: LOGIC DIAGRAM TABLE 4: HIGH FREQUENCY EDDY CURRENT INSPECTIONS OF THE LOWER LOBE FRAME INTEGRAL INBOARD CHORD AND WEB AT STA 380, LEFT AND RIGHT SIDE [Group 2, 4-6] ................................. 1 2 9 APPENDIX D: TYPICAL FRAME CONSTRUCTION AND COMPONENT IDENTIFICATION [Group 2-6] . 132 Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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Commercial Airplanes 737 Service Bulletin ALERT SummaryNumber: 737-53A1361Original Issue: July 17, 2018 ATA System: 5311 SUBJECT: FUSELAGE - Frames and Bulkheads - Section 43 Lower Lobe Frames from STA 380 to STA 520, 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.
CONCURRENT REQUIREMENTS None.
BACKGROUND This service bulletin provides instructions to inspect the Section 43 lower lobe (below the passenger floor) fuselage frames from STA 380 to STA 520 for any crack. Frame cracking is the result of fatigue caused by cyclic pressurization of the fuselage. If cracks are not detected and repaired, they can grow until the frames sever.
Continued operation of the airplane with multiple adjacent severed frames could result in uncontrolled decompression of the airplane. Also, the combination of a severed frame and fuselage skin chem-mill cracks in this area could result in an uncontrolled decompression of the airplane.
Fleet data demonstrates that frame web and frame integral inboard chord cracking is occurring on multiple airplanes in multiple locations below the passenger floor in Section 43 from STA 380 to STA 520. At the frame web stringer cutouts between stringers S-23 and S-28 left and right side, there have been five reports of cracking at multiple frame locations occurring between 59,648 and 64,421 total flight cycles and between 72,998 and 82,393 total flight hours. The cracks were between 0.5 inches and 1.4 inches in length. At the STA 380 frame, between S-20 and S-22 left side, there have been five reports of frame integral inboard chord cracking at multiple bulkhead attachment holes occurring between 31,640 and 68,093 total flight cycles and between 34,337 and 76,555 total flight hours. The cracks were as long as 1 inch in length. There have also been three reports of cracking in the frame integral inboard chords between STA 400 and STA 420 at the channel-cargo floor support attachments, S-25 left side, occurring between 57,617 and 73,174 total flight cycles and between 66,575 and 80,536 total flight hours. The cracks were as long as 0.125 inches in length.
Refer to Boeing Service Bulletins 737-53A1160, 737-53A1279 and 737-53A1323 for other reports of frame cracking and required inspections that are not addressed in this service bulletin.
Boeing Service Related Problem 737-SRP-53-0505 is related to this service bulletin.
Boeing Fleet Team Digest (FTD) 737-FTD-53-10004 is related to this service bulletin.
Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
Original Issue: July 17, 2018 737-53A1361 5 of 133
This table is provided to operators for planning purposes only. Refer to the applicable sections for more information.
ReferenceAffectedPlanning Data Paragraph 1.A.2., Spares AffectedNoSpares Affected Paragraph 1.E., Compliance and Paragraph
1.F., Approval YesAD Related Paragraph 1.H., Weight and Balance ChangesNoWeight and Balance Change Paragraph 1.I., Electrical Load DataNoElectrical Load Changed Paragraph 1.K., Publications AffectedNoPublications Affected Paragraph 1.K., Publications AffectedNoAirplane Flight Operations Affected (Flight Crew Operations Manual and/or FAA Approved Airplane Flight Manual) Paragraph 2.C.1., Kits/PartsNoKits/Parts Required Paragraph 2.C.2., Parts and Materials Supplied by the Operator NoOperator Supplied Parts/Material Paragraph 2.F., Special Tooling Necessary to do this Service Bulletin NoSpecial Tooling Required ACTION Group 1:
The Boeing Company endorses the new 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, The Boeing Company no longer provides maintenance instructions for airplanes that have accumulated flight cycles beyond the LOV. Airplanes in Group 1 (line number 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 2-6:
Do PART 2: Detailed and General Visual Inspection of the Section 43 lower lobe frames from STA 380 to STA 520, left and right side for any crack. If any crack is found, contact The Boeing Company for repair instructions and do the repair and repeat PART 2 left and right side for any crack. If no crack is found, repeat PART 2 left and right side for any crack.
Group 2-6:
Do a general visual inspection to determine if there are any repairs in the PART 3 eddy current inspection zones.
For any repairs found contact The Boeing Company for alternative inspections to this service bulletin and do the inspection(s) and any corrective actions as applicable. Also do PART 3: High Frequency Eddy Current (HFEC) Inspection at the unrepaired areas of the Section 43 lower lobe frames from STA 380 to STA 520, left and right side for any crack. If no repairs are found do PART 3, left and right side for any crack. If any crack is found, contact The Boeing Company for repair instructions and do the repair and repeat PART 3 left and right side for any crack. If no crack is found, repeat PART 3 left and right side for any crack.
Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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Group 2, 4-6:
Do a general visual inspection to determine if there are any repairs in the PART 4 eddy current inspection zones.
For any repairs found contact The Boeing Company for alternative inspections to this service bulletin and do the inspection(s) and any corrective actions as applicable. Also do PART 4: High Frequency Eddy Current (HFEC) inspection at the unrepaired areas of the lower lobe frame integral inboard chord and web at STA 380, left and right side for any crack. If no repairs are found do PART 4, left and right side for any crack. If any crack is found, contact The Boeing Company for repair instructions and do the repair and repeat PART 4 left and right side for any crack. If no crack is found, repeat PART 4 left and right side for any crack.
EFFECTIVITY 737-100, 737-200, 737-200C, 737-300, 737-400, 737-500 Airplanes. Refer to Paragraph 1.A., Effectivity, for the list of affected airplanes.
COMPLIANCE The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to this service bulletin. The Airworthiness Directive will make the compliance tasks and times given in this service bulletin mandatory.
Refer to Paragraph 1.E., Compliance.
INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are not available for the inspection given in this service bulletin.
MANPOWER Refer to Paragraph 1.G., Manpower.
MATERIAL INFORMATION None.
Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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BOEING SERVICE BULLETIN 737-53A1361
ALERT ALERT GROUPS 2, 4-6:
DO PART 4: HIGH FREQUENCY EDDY
CURRENT (HFEC) INSPECTION OF THE
LOWER LOBE FRAME INTEGRAL INBOARD CHORD AND WEB AT STA 380 LEFT SIDE STA 380 LEVO GROUPS 2-6:
DO PART 3: HIGH FREQUENCY EDDY
CURRENT (HFEC) INSPECTIONS OF THE SECTION 43 LOWER LOBE FRAMES FROM STA 380 TO 520,
LEFT SIDE DO PART 2: DETAILED AND GENERAL
VISUAL INSPECTIONS OF THE SECTION 43 LOWER LOBE FRAMES FROM STA 380 TO STA 520 RIGHT SIDE 00 GROUPS 2-6: DO PART 2: DETAILED AND GENERAL
VISUAL INSPECTIONS OF THE SECTION 43 LOWER LOBE FRAMES
- FROM STA 380 TO STA 520 LEFT SIDE ~S-17L GROUPS 2, 4-6:
DO PART 4: HIGH FREQUENCY EDDY
CURRENT (HFEC) INSPECTION OF
THE LOWER LOBE FRAME INTEGRAL
INBOARD CHORD AND WEB AT STA BL-O 380 RIGHT SIDE 00000 S-17R STA 380 GROUPS 2-6:
DO PART 3: HIGH FREQUENCY EDDY 737-200 / -300 / -400 / -500 (737-200C SAME AS 737-200 BL-O STA CURRENT (HFEC) INSPECTIONS OF THE SECTION 43 LOWER LOBE EXCEPT FOR CARGO DOOR ABOVE S-17 ON LEFT HAND SIDE) 520 RIGHT SIDE FRAMES FROM STA 380 TO STA 520, 2550177 Original Issue: July 17, 2018 Export Controlled ECCN: 9E991 737-53A1361 Copyright © Unpublished Work - See page 1 for details. 8 of 133
Commercial Airplanes 737 Service Bulletin ALERT Number: 737-53A1361 Original Issue: July 17, 2018 ATA System: 5311 SUBJECT: FUSELAGE - Frames and Bulkheads - Section 43 Lower Lobe Frames from STA 380 to STA 520, 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.
1. PLANNING INFORMATION A. Effectivity
1. Airplanes Refer to Service Bulletin Index D6-19567 Part 3 for Airplane Variable Number, Line Number, and Serial Number data.
This service bulletin is applicable to 737-100/-200/-200C/-300/-400/-500 Airplanes, line numbers 1-2565 in six groups. The Variable Numbers and Group Information for the applicable airplanes is given below.
DESCRIPTIONCONFIGURATIONGROUP 737-100/-200/-200C Airplanes, Line Numbers 1-291.-1 737-200 Airplanes, Line Numbers 292 - 1585.-2 737-200C Airplanes, Line Numbers 294 - 1113.-3 737-300 Airplanes, Line Numbers 1001 - 2565.-4 737-400 Airplanes, Line Numbers 1487 - 2564.-5 737-500 Airplanes, Line Numbers 1718 - 2553.-6 Airplane Models:
737-100, 737-200, 737-200C, 737-300, 737-400, 737-500 Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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GroupVariable Number 1PA001 - PA022 1PA099 1PA231 - PA232 1PC001 - PC005 1PG001 - PG075 1PG199 1PG201 - PG230 1PG251 - PG255 1PG271 - PG279 1PG301 - PG314 1PG331 - PG332 1PG351 - PG356 1PG375 1PG401 - PG403 1PG431 - PG442 1PG471 - PG475 1PG501 - PG505 1PG571 - PG583 2PG584 - PG586 1PG621 - PG630 1PG651 - PG652 1PG701 - PG705 2PH001 2PH011 - PH013 2PH021 - PH024 1PH701 - PH715 1PH731 - PH732 1PH741 - PH742 2PH743 1PJ001 - PJ002 2PJ003 - PJ009 1PJ031 - PJ032 Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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GroupVariable Number 1PJ071 - PJ072 1PJ101 - PJ104 2PJ105 - PJ119 2PJ201 - PJ219 5PJ301 - PJ302 5PJ551 - PJ552 2PK026 - PK029 2PK041 - PK053 2PK061 - PK070 2PK081 - PK082 2PK091 - PK099 2PK101 - PK103 2PK111 - PK120 2PK141 - PK146 2PK201 - PK204 2PK211 - PK223 2PK231 - PK241 2PK251 - PK258 2PK271 - PK274 2PK281 - PK289 2PK291 2PK301 - PK318 2PK341 2PK351 - PK361 2PK391 2PK431 - PK433 2PK451 - PK452 2PK461 - PK469 2PK495 2PK501 - PK504 2PK511 - PK515 2PK519 2PK521 - PK528 Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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GroupVariable Number 2PK541 - PK565 2PK581 2PK591 - PK599 2PK601 - PK617 2PK621 - PK637 2PK641 - PK642 2PK661 - PK666 2PK671 - PK681 2PK691 - PK697 2PK711 - PK716 2PK731 - PK765 2PK771 - PK779 2PK801 - PK804 2PK819 - PK827 2PK830 2PK861 - PK863 2PK871 - PK874 2PK881 - PK884 2PK901 - PK938 2PK971 - PK974 2PL001 - PL028 2PL061 2PL081 2PL101 - PL113 2PL151 2PL171 - PL172 2PL201 - PL203 2PL221 2PL401 - PL417 2PL421 2PL441 2PL451 - PL456 2PL471 Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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