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Commercial Airplanes 757 Requirements Bulletin ALERT Number: 757-53A0123 RB Original Issue: March 13, 2024 ATA System: 5360 SUBJECT: FUSELAGE - Section 46 - Body Station 1640 Frame Inner Chord, Web and Outer Chord Inspection EXPORT CONTROLLED - This technology or software is subject to the U.S. Export Administration Regulations (EAR), (15 C.F.R. Parts 730-774). No authorization from the U.S. Department of Commerce is required for export, re-export, in-country transfer, or access EXCEPT to country group E:1 or E:2 countries/persons per Supp.1 to Part 740 of the EAR.
9E991ECCN:
Copyright © 2024 The Boeing Company 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: March 13, 2024 757-53A0123 RB 1 of 178
4.0
Export Controlled ECCN: 9E991 See page 1 for details Original Issue: March 13, 2024 757-53A0123 RB 2 of 178 REQUIREMENTS BULLETIN 757-53A0123
ALERTALERT
BLANK PAGE
Table of Contents
1. EFFECTIVITY5
A. Airplanes5
B. Spares Affected7
2. CONCURRENT REQUIREMENTS7
3. COMPLIANCE7
4. APPROVAL46
5. ACCOMPLISHMENT INSTRUCTIONS47
A. General Information47
B. Work Instructions49
FIGURE 1: LEFT SIDE - STA 1640 FRAME INNER CHORD, WEB AND OUTER CHORD - GENERAL
VISUAL INSPECTION (GVI)83
FIGURE 2: LEFT SIDE - FUSELAGE FRAME WEB AT STA 1640 BETWEEN S-9L AND S-10L - SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION - LOCATION 1, APPROVED
FRAME SEGMENT REPLACEMENT REPAIR94
FIGURE 3: LEFT SIDE- FUSELAGE FRAME WEB AT STA 1640 BETWEEN S-9L AND S-10L - OPEN-HOLE HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION - LOCATION 1, NO EXISTING
REPAIR97
FIGURE 4: LEFT SIDE - FUSELAGE FRAME INNER CHORD AT STA 1640 BETWEEN S-10L AND S-11L
- SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION - LOCATION 2, NO
EXISTING REPAIR100
FIGURE 5: LEFT SIDE - FUSELAGE FRAME WEB AT STA 1640 AND S-10L - OPEN-HOLE HIGH
FREQUENCY EDDY CURRENT (HFEC) INSPECTION - LOCATION 3103
FIGURE 6: LEFT SIDE - FUSELAGE FRAME WEB AT STA 1640 BETWEEN S-11L AND S-13L -
SUB-SURFACE LOW FREQUENCY EDDY CURRENT (LFEC) INSPECTION - LOCATIONS
4 AND 5107
FIGURE 7: LEFT SIDE - FUSELAGE FRAME INNER CHORD AT STA 1640 BETWEEN S-11L AND S-13L
- SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION - LOCATION 6. 111 FIGURE 8: LEFT SIDE - FUSELAGE FRAME INNER CHORD AT STA 1640 BETWEEN S-13L AND S-14L
- SUBSURFACE LOW FREQUENCY EDDY CURRENT (LFEC) INSPECTION - LOCATION 7
[Group 1-3]114
FIGURE 9: LEFT SIDE - FUSELAGE FRAME WEB AND OUTER CHORD AT STA 1640 BELOW S-13L - SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION - LOCATION 8,
AIRPLANES WITH A BACKUP FITTING INSTALLED118
FIGURE 10: LEFT SIDE - FUSELAGE FRAME WEB AND OUTER CHORD AT STA 1640 BELOW S-13L - SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION - LOCATION 8,
AIRPLANES WITHOUT A BACKUP FITTING INSTALLED121
FIGURE 11: LEFT SIDE - FUSELAGE FRAME WEB AT STA 1640 LOWER HINGE FITTING - OPEN-HOLE
HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION - LOCATION 9124
FIGURE 12: LEFT SIDE - FUSELAGE FRAME WEB AT STA 1640 ABOVE S-19L - SURFACE HIGH
FREQUENCY EDDY CURRENT (HFEC) INSPECTION - LOCATION 10127
FIGURE 13: RIGHT SIDE - STA 1640 FRAME INNER CHORD, WEB AND OUTER CHORD - GENERAL
VISUAL INSPECTION (GVI)131
FIGURE 14: RIGHT SIDE - FUSELAGE FRAME WEB AT STA 1640 BETWEEN S-9R AND S-10R - SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION - LOCATION 1, APPROVED
FRAME SEGMENT REPLACEMENT REPAIR142
FIGURE 15: RIGHT SIDE - FUSELAGE FRAME WEB AT STA 1640 BETWEEN S-9R AND S-10R - OPEN-HOLE HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION - LOCATION 1,
NO EXISTING REPAIR145
Export Controlled ECCN: 9E991 See page 1 for details Original Issue: March 13, 2024 757-53A0123 RB 3 of 178 REQUIREMENTS BULLETIN 757-53A0123
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FIGURE 16: RIGHT SIDE - FUSELAGE FRAME INNER CHORD AT STA 1640 BETWEEN S-10R AND S-11R - SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION - LOCATION
2, NO EXISTING REPAIR148
FIGURE 17: RIGHT SIDE - FUSELAGE FRAME WEB AT STA 1640 AND S-10R - OPEN-HOLE HIGH
FREQUENCY EDDY CURRENT (HFEC) INSPECTION - LOCATION 3151
FIGURE 18: RIGHT SIDE - FUSELAGE FRAME WEB AT STA 1640 BETWEEN S-11R AND S-13R -
SUB-SURFACE LOW FREQUENCY EDDY CURRENT (LFEC) INSPECTION - LOCATIONS
4 AND 5155
FIGURE 19: RIGHT SIDE - FUSELAGE FRAME INNER CHORD AT STA 1640 BETWEEN S-11R AND S-13R - SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION - LOCATION
6159
FIGURE 20: RIGHT SIDE - FUSELAGE FRAME INNER CHORD AT STA 1640 BETWEEN S-13R AND S-14R - SUBSURFACE LOW FREQUENCY EDDY CURRENT (LFEC) INSPECTION -
LOCATION 7 [Group 1-3]162
FIGURE 21: RIGHT SIDE - FUSELAGE FRAME WEB AND OUTER CHORD AT STA 1640 BELOW S-13R
- SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION - LOCATION 8,
AIRPLANES WITH A BACKUP FITTING INSTALLED166
FIGURE 22: RIGHT SIDE - FUSELAGE FRAME WEB AND OUTER CHORD AT STA 1640 BELOW S-13R
- SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION - LOCATION 8,
AIRPLANES WITHOUT A BACKUP FITTING INSTALLED169
FIGURE 23: RIGHT SIDE - FUSELAGE FRAME WEB AT STA 1640 LOWER HINGE FITTING - OPEN-HOLE
HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION - LOCATION 9172
FIGURE 24: RIGHT SIDE - FUSELAGE FRAME WEB AT STA 1640 ABOVE S-19R - SURFACE HIGH
FREQUENCY EDDY CURRENT (HFEC) INSPECTION - LOCATION 10175
Export Controlled ECCN: 9E991 See page 1 for details Original Issue: March 13, 2024 757-53A0123 RB 4 of 178 REQUIREMENTS BULLETIN 757-53A0123
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Commercial Airplanes 757 Requirements Bulletin ALERT Number: 757-53A0123 RB Original Issue: March 13, 2024 ATA System: 5360 SUBJECT: FUSELAGE - Section 46 - Body Station 1640 Frame Inner Chord, Web and Outer Chord 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, 757-300 Airplane(s), line number(s) 1-138, 140, 142, 144-146, 148, 150-175, 177-180, 182-183, 185, 187-188, 190, 192, 194, 196, 198, 200-236, 238-257, 259-299, 301-313, 315-317, 319-321, 323-325, 327-329, 331-333, 335-339, 341-394, 396-398, 400-402, 404-406, 408-410, 412-476, 478-480, 482-484, 486-488, 490-492, 494-568, 570-572, 574-576, 578, 580, 582-624, 626-627, 629-630, 632-633, 635, 637, 639, 641, 643, 645, 647-648, 650, 652-653, 655, 657-658, 660-674, 676-678, 680-682, 684-686, 688-690, 692-727, 731-732, 735-754, 756-758, 760-762, 764, 766, 768, 770, 772-773, 775, 777, 779-812, 814, 816-822, 824-878, 880-881, 883-1050 in 5 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.
The Variable Numbers and Group Information for the applicable airplanes is given below.
DESCRIPTIONCONFIGURATIONGROUP 757-200 and -200CB airplanes with a long inner chord strap.-1 757-200 airplanes that have been converted to Special Freighter (757-200SF) using STC ST00916WI-D and have a long inner chord strap.
-2 757-300 airplanes.-3 757-200 airplanes with a short inner chord strap.-4 Export Controlled ECCN: 9E991 See page 1 for details Original Issue: March 13, 2024 757-53A0123 RB 5 of 178
DESCRIPTIONCONFIGURATIONGROUP 757-200 airplanes that have been converted to Special Freighter (757-200SF) using STC ST00916WI-D and have a short inner chord strap.
-5 Airplane Models:
757-200, 757-200CB, 757-300 GroupVariable Number 4NA001 - NA021 1NA022 - NA028 4NA191 1NA192 - NA199 5NA201 - NA204 4NA205 5NA206 - NA213 4NA214 2NA215 - NA236 1NA237 - NA239 1NA301 - NA305 1NA341 - NA352 1NA391 - NA399 4NA401 - NA403 1NA404 - NA408 1NA441 - NA447 4NA501 - NA504 1NA505 - NA586 4NB001 1NB002 - NB004 1NB021 - NB023 1NB036 - NB041 1NB051 - NB053 1NB061 - NB073 1NB079 GroupVariable Number 1NB131 - NB148 1NB161 - NB162 1NB166 - NB168 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 GroupVariable Number 1NC091 - NC094 1NC151 1NC161 1ND001 - ND007 1ND011 - ND059 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 Export Controlled ECCN: 9E991 See page 1 for details Original Issue: March 13, 2024 757-53A0123 RB 6 of 178 REQUIREMENTS BULLETIN 757-53A0123
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GroupVariable Number 3NL001 - NL002 3NL006 - NL017 3NL101 - NL109 3NL141 3NL601 - NL616 1NN001 - NN002 1NN051 - NN052 1NP901 - NP904 1NT201 - NT202 1NT231 - NT234 1NT237 - NT240 1NT242 GroupVariable Number 1NT245 - NT248 1NT281 - NT289 1NT341 - NT347 1NT351 - NT360 1NT371 - NT373 1NT375 - NT379 1NT381 - NT386 1NT401 - NT409 1NT411 - NT412 1NT426 - NT427 1NT431 - NT432 1NT436 - NT438 GroupVariable Number 1NT441 - NT442 1NT446 1NT701 - NT769 1NT791 - NT796 1NT861 - NT862 1NT881 - NT885 1NT901 - NT916 1NT971 - NT985 1NU031 - NU038 3NU701 - NU705 3NU721 - NU728 3NU731 - NU732 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 757-53A0123 RB. The Airworthiness Directive will make the compliance tasks and times given in Requirements Bulletin 757-53A0123 RB mandatory.
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.
Accomplish the required action(s), based on the applicable condition(s) in Table 1 through Table 22, in accordance with Accomplishment Instructions.
Export Controlled ECCN: 9E991 See page 1 for details Original Issue: March 13, 2024 757-53A0123 RB 7 of 178 REQUIREMENTS BULLETIN 757-53A0123
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Table 1: General Visual Inspection (GVI) or Maintenance Records Check - STA 1640 Frame, Left Side Repeat Interval (Not to Exceed) Boeing Recommended Compliance Time (Whichever Occurs Later) ActionCondition -Within 2,000 flight cycles after the Original Issue date of Requirements Bulletin 757- 53A0123 RB.
Before 20,000 total flight cycles.
ACTION 1:
Do a GVI of the STA 1640 frame between Stringers S-9L and S-19L for any approved frame segment replacement repair. (a)(b) Group 1 Airplanes.
ACTION 2:
Do a GVI of the STA 1640 frame at specified locations for any local repair. (b)(c) -Within 2,000 Flight cycles after the Original Issue date of Requirements Bulletin 757-53A0123 RB.
ACTION 1:
Do a GVI of the STA 1640 frame between Stringers S-9L and S-19L for any approved frame segment replacement repair. (a)(b) Group 2, 4-5 Airplanes.
-Within 2,000 Flight cycles after the Original Issue date of Requirements Bulletin 757-53A0123 RB ACTION 2:
Do a GVI of the STA 1640 frame at specified locations for any local repair. (b)(c) -Within 2,000 flight cycles after the Original Issue date of Requirements Bulletin 757- 53A0123 RB.
Before 10,000 total flight cycles.
ACTION 1:
Do a GVI of the STA 1640 frame between Stringers S-9L and S-19L for any approved frame segment replacement repair. (a)(b) Group 3 Airplanes.
ACTION 2:
Do a GVI of the STA 1640 frame at specified locations for any local repair. (b)(c) Export Controlled ECCN: 9E991 See page 1 for details Original Issue: March 13, 2024 757-53A0123 RB 8 of 178 REQUIREMENTS BULLETIN 757-53A0123
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Table 1: General Visual Inspection (GVI) or Maintenance Records Check - STA 1640 Frame, Left Side Repeat Interval (Not to Exceed) Boeing Recommended Compliance Time (Whichever Occurs Later) ActionCondition -At the times specified in Table 3.Group 1:CONDITION 1:
Do the actions specified in Compliance Table 3.
ANY APPROVED
FRAME SEGMENT
REPLACEMENT RE- PAIR FOUND. -At the times specified in Table 5.Group 2:Do the actions specified in Compliance Table 5.
-At the times specified in Table 7.Group 3:
Do the actions specified in Compliance Table 7.
-At the times specified in Table 9.Group 4:
Do the actions specified in Compliance Table 9.
-At the times specified in Table 11.Group 5:
Do the actions specified in Compliance Table 11.
-At the times specified in Table 4.Group 1:CONDITION 2:
Do the actions specified in Compliance Table 4.
NO LOCAL REPAIR
FOUND AT ANY
SPECIFIED LOCATION
AND NO FRAME SEG-
MENT REPLACEMENT REPAIR FOUND. (c) -At the times specified in Table 6.Group 2:
Do the actions specified in Compliance Table 6.
-At the times specified in Table 8.Group 3:
Do the actions specified in Compliance Table 8.
-At the times specified in Table 10.Group 4:
Do the actions specified in Compliance Table 10.
-At the times specified in Table 12.Group 5:
Do the actions specified in Compliance Table 12.
Export Controlled ECCN: 9E991 See page 1 for details Original Issue: March 13, 2024 757-53A0123 RB 9 of 178 REQUIREMENTS BULLETIN 757-53A0123
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Table 1: General Visual Inspection (GVI) or Maintenance Records Check - STA 1640 Frame, Left Side Repeat Interval (Not to Exceed) Boeing Recommended Compliance Time (Whichever Occurs Later) ActionCondition -Group 1:Group 1:Contact The Boeing Company for alternative inspections and do the inspections and oncondition corrective actions.
CONDITION 3:
ANY FRAME SEG-
MENT REPLACEMENT
REPAIR FOUND THAT
IS NOT AN AP-
PROVED FRAME
SEGMENT REPLACE- MENT REPAIR.
Within 2,000 flight cycles after the Original Issue date of Requirements Bulletin 757- 53A0123 RB.
Before 20,000 total flight cycles.
OR
LOCAL REPAIR
FOUND AT ANY
SPECIFIED LOCA- TION. (c) -Group 2, 4, 5:
Within 2,000 flight cycles after the Original Issue date of Requirements Bulletin 757-53A0123 RB.
-Group 3:Group 3:
Within 2,000 flight cycles after the Original Issue date of Requirements Bulletin 757- 53A0123 RB.
Before 10,000 total flight cycles.
(a) For Requirements Bulletin 757-53A0123 RB, an approved frame segment replacement repair is defined as a frame segment replacement repair that is Boeing ODA-approved with an FAA Form 8100-9 and meets all of the following requirements:
1. The frame segment replacement repair is a repair that splices in a new section of a frame from above S-10 to S-19 and meets the requirements specified in the Boeing Multi-Operator Message MOM-MOM-17-0037-01B, dated 20 Jan 2017, REF/I/ 757 Frame 1640 Partial Frame Replacement Repair Proposal.
2. Any Boeing ODA approved deviations to the requirements specified in the Boeing Multi-Operator Message MOM-MOM-17-0037-01B, dated 20 Jan 2017, REF/I/ 757 Frame 1640 Partial Frame Replacement Repair Proposal are acceptable if they are outside of the local repair inspection locations 1 through 10 in Requirements Bulletin 757-53A0123 RB.
3. There are no local repairs (reinforcing or non-reinforcing), or any oversized fastener that exceeds 1/32 inch diameter over the production fastener size in the areas common to inspection locations 1 through 10 in Requirements Bulletin 757-53A0123 RB. Frame segment replacement repair splice parts are not considered a local repair.
(b) A Maintenance records check is acceptable in lieu of the General Visual Inspection if the records review can conclusively determine a repair exists in that location.
(c) Frame segment replacement repair splice parts are not considered a local repair.
Export Controlled ECCN: 9E991 See page 1 for details Original Issue: March 13, 2024 757-53A0123 RB 10 of 178 REQUIREMENTS BULLETIN 757-53A0123
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Table 2: General Visual Inspection (GVI) or Maintenance Records Check - STA 1640 Frame, Right Side Repeat Interval (Not to Exceed) Boeing Recommended Compliance Time (Whichever Occurs Later) ActionCondition -Within 2,000 flight cycles after the Original Issue date of Requirements Bulletin 757- 53A0123 RB.
Before 20,000 total flight cycles.
ACTION 1:
Do a GVI of the STA 1640 frame between Stringers S-9R and S-19R for any approved frame segment replacement repair. (a)(b) Group 1 Airplanes.
ACTION 2:
Do a GVI of the STA 1640 frame at specified locations for any local repair.(b)(c) -Within 2,000 Flight cycles after the Original Issue date of Requirements Bulletin 757-53A0123 RB.
ACTION 1:
Do a GVI of the STA 1640 frame between Stringers S-9R and S-19R for any approved frame segment replacement repair. (a)(b) Group 2, 4-5 Airplanes.
-Within 2,000 Flight cycles after the Original Issue date of Requirements Bulletin 757-53A0123 RB ACTION 2:
Do a GVI of the STA 1640 frame at specified locations for any local repair.(b)(c) -Within 2,000 flight cycles after the Original Issue date of Requirements Bulletin 757- 53A0123 RB.
Before 10,000 total flight cycles.
ACTION 1:
Do a GVI of the STA 1640 frame between Stringers S-9R and S-19R for any approved frame segment replacement repair. (a)(b) Group 3 Airplanes.
ACTION 2:
Do a GVI of the STA 1640 frame at specified locations for any local repair.(b)(c) Export Controlled ECCN: 9E991 See page 1 for details Original Issue: March 13, 2024 757-53A0123 RB 11 of 178 REQUIREMENTS BULLETIN 757-53A0123
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Table 2: General Visual Inspection (GVI) or Maintenance Records Check - STA 1640 Frame, Right Side Repeat Interval (Not to Exceed) Boeing Recommended Compliance Time (Whichever Occurs Later) ActionCondition -At the times specified in Table 13.Group 1:CONDITION 1:
Do the actions specified in Compliance Table 13.
ANY APPROVED
FRAME SEGMENT
REPLACEMENT RE- PAIR FOUND. -At the times specified in Table 15.Group 2:Do the actions specified in Compliance Table 15.
-At the times specified in Table 17.Group 3:
Do the actions specified in Compliance Table 17.
-At the times specified in Table 19.Group 4:
Do the actions specified in Compliance Table 19.
-At the times specified in Table 21.Group 5:
Do the actions specified in Compliance Table 21.
-At the times specified in Table 14.Group 1:CONDITION 2:
Do the actions specified in Compliance Table 14.
NO LOCAL REPAIR
FOUND AT ANY
SPECIFIED LOCATION
AND NO FRAME SEG-
MENT REPLACEMENT REPAIR FOUND. (c) -At the times specified in Table 16.Group 2:
Do the actions specified in Compliance Table 16.
-At the times specified in Table 18.Group 3:
Do the actions specified in Compliance Table 18.
-At the times specified in Table 20.Group 4:
Do the actions specified in Compliance Table 20.
-At the times specified in Table 22.Group 5:
Do the actions specified in Compliance Table 22.
Export Controlled ECCN: 9E991 See page 1 for details Original Issue: March 13, 2024 757-53A0123 RB 12 of 178 REQUIREMENTS BULLETIN 757-53A0123