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Commercial Airplanes 737 Requirements Bulletin ALERT Number: 737-53A1383 RB Original Issue: May 09, 2019 Revision 1: February 19, 2020 ATA System: 5313 SUBJECT: FUSELAGE - Structure Around Openings - Forward Galley Door Bear Strap 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 © 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Unpublished Work.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: May 09, 2019 737-53A1383 RBRevision 1: February 19, 2020 1 of 37
3.0
Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
Original Issue: May 09, 2019 737-53A1383 RBRevision 1: February 19, 2020 2 of 37 REQUIREMENTS BULLETIN 737-53A1383
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Table of Contents
Revision Transmittal Sheet5
1. EFFECTIVITY7
A. Airplanes7
B. Spares Affected9
2. CONCURRENT REQUIREMENTS9
3. COMPLIANCE9
4. APPROVAL16
5. ACCOMPLISHMENT INSTRUCTIONS19
A. General Information19
B. Work Instructions20
FIGURE 1: FORWARD GALLEY DOOR BEAR STRAP - INTERNAL GENERAL VISUAL INSPECTION
.27
FIGURE 2: FORWARD GALLEY DOOR BEAR STRAP - INTERNAL SURFACE HIGH FREQUENCY EDDY
CURRENT (HFEC) INSPECTION29
FIGURE 3: FORWARD GALLEY DOOR BEAR STRAP - EXTERNAL GENERAL VISUAL INSPECTION
.32
FIGURE 4: FORWARD GALLEY DOOR BEAR STRAP - EXTERNAL EDDY CURRENT INSPECTIONS
.34
Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
Original Issue: May 09, 2019 737-53A1383 RBRevision 1: February 19, 2020 3 of 37 REQUIREMENTS BULLETIN 737-53A1383
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Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
Original Issue: May 09, 2019 737-53A1383 RBRevision 1: February 19, 2020 4 of 37 REQUIREMENTS BULLETIN 737-53A1383
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Commercial Airplanes 737 Requirements Bulletin ALERT Revision Transmittal SheetNumber: 737-53A1383 RBOriginal Issue: May 09, 2019 Revision 1: February 19, 2020 ATA System: 5313 SUBJECT: FUSELAGE - Structure Around Openings - Forward Galley Door Bear Strap Inspection This revision includes all pages of the requirements bulletin.
COMPLIANCE INFORMATION RELATED TO THIS REVISION Federal Aviation Administration (FAA) Notice of Proposed Rule Making 2019-NM-098-AD, is related to Requirements Bulletin 737-53A1383 RB.
Effects of this Revision on airplanes on which the Original Issue was previously done:
ActionConditionGroup The more work is to do as follows:No crack was found.
All airplanes that have done Option 2, Condition 4 (no external repair and have done the external Low Frequency Eddy Current (LFEC) inspection of the forward galley door bear strap and external High Frequency Eddy Current (HFEC) inspection of the fuselage skin for any crack).
Do the external LFEC inspection of the forward galley door bear strap and external HFEC inspection of the fuselage skin for any crack in accordance with FIG- URE 4.
Before 15,000 total flight cycles or Within 6,000 flight cycles after the original issue date of Requirements Bulletin 737-53A1383 RB Whichever occurs later.
REASON FOR REVISION This revision is sent to correct thickness callouts for the fuselage skin and bear strap.
These sections in the Requirements Bulletin (RB) were changed:
1. In Paragraph 1.A.1. Airplanes, added effectivity variable number tables.
2. In Paragraph 3. COMPLIANCE, added Federal Aviation Administration (FAA) Notice of Proposed Rule Making 2019-NM-098-AD.
3. In Paragraph 3. COMPLIANCE, B. WORK INSTRUCTIONS and Figures 2-4, changed "skin" to "fuselage skin".
4. In Figure 4, Footnote (a), changed fuselage skin and bear strap thickness callouts and removed gap cover thickness.
Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
Original Issue: May 09, 2019 737-53A1383 RBRevision 1: February 19, 2020 5 of 37
5. In Figure 4, Footnote (b), changed fuselage skin and bear strap thickness callouts and removed outer chord thickness.
Vertical lines are put on the left edge of each page, except in Paragraph 1.A., Effectivity and format changes, to show the location of all content changes.
Pages with no vertical lines have no changes.
REVISION HISTORY Service BulletinService BulletinRequirement BulletinRequirement Bulletin 737-53A1383737-53A1383737-53A1383 RB737-53A1383 RB Issue DateIssue Date May 09, 2019Original Issue:May 09, 2019Original Issue:
February 19, 2020Revision 1:February 19, 2020Revision 1:
Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
Original Issue: May 09, 2019 737-53A1383 RBRevision 1: February 19, 2020 6 of 37 REQUIREMENTS BULLETIN 737-53A1383
ALERTALERT
Commercial Airplanes 737 Requirements Bulletin ALERT Number: 737-53A1383 RB Original Issue: May 09, 2019 Revision 1: February 19, 2020 ATA System: 5313 SUBJECT: FUSELAGE - Structure Around Openings - Forward Galley Door Bear Strap 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 737-600, 737-700, 737-700C, 737-800, 737-900 Airplane(s), line number(s) 1-1762 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.
Airplane Models:
737-600, 737-700, 737-700C, 737-800, 737-900 GroupVariable Number 1YA001 - YA099 1YA101 - YA199 1YA201 - YA211 1YA221 1YA231 - YA242 1YA251 - YA256 1YA271 - YA272 1YA291 1YA301 - YA302 GroupVariable Number 1YA311 - YA314 1YA321 - YA323 1YA336 - YA345 1YA351 1YA356 - YA357 1YA366 - YA367 1YA371 - YA377 1YA501 - YA536 1YA541 - YA552 GroupVariable Number 1YA571 - YA578 1YA601 - YA615 1YA621 - YA622 1YA626 - YA631 1YA635 - YA636 1YA641 - YA642 1YA645 - YA650 1YA656 - YA659 1YA666 - YA667 Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
Original Issue: May 09, 2019 737-53A1383 RBRevision 1: February 19, 2020 7 of 37
GroupVariable Number 1YA671 - YA672 1YA681 - YA691 1YA701 - YA710 1YA721 - YA722 1YA731 - YA734 1YA751 - YA756 1YA801 - YA803 1YA809 1YA811 - YA814 1YA831 - YA835 1YA841 - YA862 1YA881 - YA882 1YA891 - YA892 1YA961 - YA976 1YB001 - YB006 1YB101 - YB132 1YB151 - YB153 1YB156 - YB158 1YB161 - YB164 1YB171 - YB172 1YB181 - YB184 1YB201 - YB208 1YB271 1YB276 1YB301 - YB310 1YB371 - YB381 1YB501 - YB502 1YB521 - YB526 1YB541 - YB544 1YB551 1YB561 - YB574 1YB576 - YB577 1YB581 - YB587 GroupVariable Number 1YB601 - YB632 1YB651 1YB656 1YB851 - YB863 1YB871 - YB873 1YB881 - YB888 1YB901 - YB903 1YB911 1YC001 - YC030 1YC051 - YC083 1YC091 - YC094 1YC101 - YC104 1YC111 - YC113 1YC121 1YC126 - YC127 1YC136 - YC141 1YC146 - YC147 1YC151 - YC156 1YC166 - YC171 1YC176 - YC178 1YC186 - YC189 1YC201 - YC203 1YC206 - YC207 1YC301 - YC305 1YC321 - YC386 1YC391 - YC394 1YC396 1YC401 - YC417 1YC421 - YC422 1YC426 - YC428 1YC436 - YC437 1YC441 - YC448 1YC451 - YC455 GroupVariable Number 1YC459 1YC461 - YC467 1YC471 - YC499 1YC501 - YC526 1YC571 - YC583 1YC587 - YC589 1YC591 - YC593 1YC601 - YC655 1YC681 - YC696 1YC701 - YC715 1YC720 - YC725 1YC727 - YC741 1YC751 - YC752 1YC761 - YC770 1YC781 - YC793 1YC801 - YC892 1YC901 - YC907 1YC921 - YC922 1YC931 - YC932 1YC941 - YC951 1YC971 - YC978 1YC981 - YC983 1YD001 - YD007 1YD021 - YD025 1YD041 - YD057 1YD081 - YD084 1YD101 - YD108 1YD121 - YD126 1YD151 - YD159 1YD171 - YD172 1YD201 - YD203 1YD206 - YD209 1YD216 - YD219 Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
Original Issue: May 09, 2019 737-53A1383 RBRevision 1: February 19, 2020 8 of 37 REQUIREMENTS BULLETIN 737-53A1383
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GroupVariable Number 1YD251 - YD254 1YD256 - YD257 1YD261 1YD301 - YD334 1YD391 1YD401 - YD410 1YD412 1YD481 - YD485 1YD491 1YD501 - YD512 1YD531 - YD535 1YD541 - YD547 1YD561 - YD564 1YD571 - YD572 1YD591 - YD595 1YD601 - YD612 1YD651 - YD654 1YE001 - YE020 1YE051 1YE101 - YE109 1YE151 - YE157 1YE171 - YE172 1YE201 - YE206 1YE301 - YE305 1YE321 - YE326 GroupVariable Number 1YE371 1YG001 - YG044 1YG061 - YG064 1YG066 - YG089 1YG091 - YG092 1YG201 1YG211 1YG501 - YG508 1YG601 - YG602 1YJ001 - YJ004 1YJ011 - YJ013 1YJ021 1YJ471 - YJ480 1YJ501 - YJ517 1YJ531 - YJ547 1YJ591 - YJ594 1YJ631 - YJ632 1YJ671 - YJ682 1YJ801 - YJ853 1YJ861 - YJ867 1YJ871 1YJ901 - YJ902 1YJ911 - YJ923 1YJ931 - YJ936 1YJ941 - YJ943 GroupVariable Number 1YK001 - YK007 1YK101 - YK104 1YK111 - YK112 1YK121 - YK122 1YK131 - YK132 1YK136 - YK137 1YK301 - YK304 1YK321 - YK330 1YK361 - YK366 1YK401 - YK406 1YK426 - YK427 1YK431 - YK432 1YK456 - YK460 1YK480 - YK484 1YK511 - YK512 1YK601 1YM101 - YM103 1YM201 - YM204 1YM251 - YM268 1YM471 1YM481 - YM482 1YM501 1YM521 1YM541 1YM551 B. Spares Affected None.
2. CONCURRENT REQUIREMENTS None.
3. COMPLIANCE Federal Aviation Administration (FAA) Notice of Proposed Rule Making 2019-NM-098-AD, is related to Requirements Bulletin 737-53A1383 RB.
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For airplanes which have incorporated Boeing Business Jet (BBJ) Lower Cabin Altitude Supplemental Type Certificate (STC) ST01697SE (6500 feet maximum cabin altitude in lieu of 8000 feet) as referenced in Boeing SB 737-21-1149, the flight cycle related compliance times are different from those specified in this requirements bulletin. All initial compliance times (threshold and grace period) specified in flight cycles must be reduced to half of those specified in Requirements Bulletin 737-53A1383 RB. All repeat interval compliance times specified in flight cycles must be reduced to one-quarter of those specified in Requirements Bulletin 737-53A1383 RB.
Accomplish the required actions, based on the applicable conditions in Table 1 or 2, 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.
All airplanes must do one of the following Options:
– Option 1: Do Table 1 - Internal and External General Visual Inspection and Internal Surface High Frequency Eddy Current (HFEC) Inspection of the Forward Galley Door Bear Strap.
– Option 2: Do Table 2 - External General Visual Inspection and External Eddy Current Inspections of the Forward Galley Door Bear Strap and Fuselage Skin.
Table 1: Option 1 - Internal and External General Visual Inspection and Internal Surface High Frequency Eddy Current (HFEC) Inspection of the Forward Galley Door Bear Strap Repeat Interval (Not to Exceed) Compliance Time (Whichever Occurs Later) ActionCondition -Within 6,000 flight cycles after the original issue date of Requirements Bulletin 737- 53A1383 RB.
Before 15,000 total flight cycles.
Do an internal and external general visual inspection of the forward galley door bear strap, for any repair.
All Airplanes -Before further flight.CONDITION 1 (ACTION 1):CONDITION 1:
Contact The Boeing Company for alternative inspection(s) to the Requirements Bulletin 737-53A1383 RB, and do the inspection(s) and applicable on-condition action(s).
ANY REPAIR FOUND.
(a) -Before further flight.CONDITION 1 (ACTION 2):
Do an internal surface HFEC inspection of the forward galley door bear strap, for any crack at the unrepaired areas.
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Table 1: Option 1 - Internal and External General Visual Inspection and Internal Surface High Frequency Eddy Current (HFEC) Inspection of the Forward Galley Door Bear Strap Repeat Interval (Not to Exceed) Compliance Time (Whichever Occurs Later) ActionCondition -Before further flight.CONDITION 1.1 (ACTION 1):CONDITION 1.1:
Contact The Boeing Company for repair instructions and do the repair.
ANY CRACK FOUND.
18,000 flight cycles.-CONDITION 1.1 (ACTION 2):
Repeat the internal surface HFEC inspection of the forward galley door bear strap, for any crack.
(b) 18,000 flight cycles.-Repeat the internal surface HFEC inspection of the forward galley door bear strap, for any crack.
CONDITION 1.2:
NO CRACK FOUND.
(b) -Before further flight.Do an internal surface HFEC inspection of the forward galley door bear strap, for any crack.
CONDITION 2:
NO REPAIR FOUND.
-Before further flight.CONDITION 2.1 (ACTION 1):CONDITION 2.1:
Contact The Boeing Company for repair instructions and do the repair.
ANY CRACK FOUND.
18,000 flight cycles.-CONDITION 2.1 (ACTION 2):
Repeat the internal surface HFEC inspection of the forward galley door bear strap, for any crack.
(b) 18,000 flight cycles.-Repeat the internal surface HFEC inspection of the forward galley door bear strap, for any crack.
CONDITION 2.2:
NO CRACK FOUND.
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Table 1: Option 1 - Internal and External General Visual Inspection and Internal Surface High Frequency Eddy Current (HFEC) Inspection of the Forward Galley Door Bear Strap Repeat Interval (Not to Exceed) Compliance Time (Whichever Occurs Later) ActionCondition
(a) It is not required to contact Boeing, if one or a combination of the following repairs has been installed.
1. Remove and replace gap cover in accordance with Boeing installation drawings (141A8350),
2. Up to second oversized fastener holes in accordance with 737-600 SRM 51-40-05, or 737-700 SRM 51-40-05, or 737-700CONV SRM 51-40-05, or 737-700IGW (BBJ) SRM 51-40-05, or 737- 800 SRM 51-40-05, or 737-800BCF SRM 51-40-05 or 737-900 SRM 51-40-05.
3. Fuselage skin blend out within the 737-600 SRM 53-00-01, or 737-700 SRM 53-00-01, or 737- 700CONV SRM 53-00-01, or 737-700IGW (BBJ) SRM 53-00-01, or 737-800 SRM 53-00-01, or 737-800BCF SRM 53-00-01, or 737-900 SRM 53-00-01 allowable damage.
(b) It is not required to do the internal surface HFEC inspection in areas where a repair covers the affected inspection zone if the repair meets the conditions that follow:
1. The repair is the corrective action to the crack condition identified in Requirements Bulletin 737- 53A1383 RB and installed after the original issue date of Requirements Bulletin 737-53A1383
RB, AND
2. The installed repair was approved by the Boeing Organization Designation Authorization (ODA) via a FAA Form 8100-9.
Table 2: Option 2 - External General Visual Inspection and External Eddy Current Inspections of the Forward Galley Door Bear Strap and Fuselage Skin Repeat Interval (Not to Exceed) Compliance Time (Whichever Occurs Later) ActionCondition -Within 6,000 flight cycles after the original issue date of Requirements Bulletin 737- 53A1383 RB.
Before 15,000 total flight cycles.
Do the external general visual inspection of the gap cover and fuselage skin in the forward galley door bear strap eddy current inspection zones, for any repair.
All Airplanes -Before further flight.Contact The Boeing Company for alternative inspection(s) to the Requirements Bulletin 737- 53A1383 RB, and do the inspection(s) and applicable on-condition action(s).
CONDITION 3:
ANY EXTERNAL RE- PAIR FOUND.
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Original Issue: May 09, 2019 737-53A1383 RBRevision 1: February 19, 2020 12 of 37 REQUIREMENTS BULLETIN 737-53A1383