Service difficulty report · Doubler · Boeing 7377H4

Difficulty date
July 2, 2021
Submitted
August 4, 2021
Operation
Air carrier
Aircraft
N940WN
Make and model
Boeing 7377H4
Aircraft serial
36900
Aircraft time
39,596 hours, 24,067 cycles
Part
Doubler
Condition
Cracked
Location
Bs 663 Bulkhead
Stage of operation
IN
How discovered
9
Nature of condition
O
Precautionary procedure
K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

CRACK ON DOUBLER ON FWD SIDE OF L/H BS663 VAPOR BARRIER AT LBL25 WL146 ; / [01] REMOVED DOUBLER ON FWD SIDE OF VAPOR BARRIER BS 663 LBL6-31 IAW SRM 51-40-02-0G-0.; [02] INSTALLED 100% TEMPORARY FASTENERS ON AFT SIDE OF DOUBLER REPAIR AREA (VERTICAL STIFFENERS BS 663 LBL6;25-31)BEFORE SQUEEZE OUT TIME EXPIRED APPLIED BMS5-95 C-20 JUL-05-2021 UTC 14:00 HRS EXPIRATION TIME JUL-06-2021 UTC 10:HRS. IAW SOPM 20-50-19.; [03] VERIFIED INSTALLED 100% TEMPORARY FASTENERS ON AFT SIDE OF DOUBLER REPAIR AREA (VERTICAL STIFFENERS BS 663 LBL6;25-31)BEFORE SQUEEZE OUT TIME EXPIRED APPLIED BMS5-95 C-20 JUL-05-2021 UTC 14:00 HRS EXPIRATION TIME JUL-06-2021 UTC 10:HRS. IAW SOPM 20-50-19.; [04] COMFORMED NEW DOUBLER AND VERIFIED HEAT TREATMENT FABRICATION MAT. USED 2024 T42 CLAD 0.040' LOT#1391616-1 R.O 829384-SWA; LOCATED;DRILLED APPLIED CHEMICAL CONVERSION COATING AND PRIMER IAW .BAC 5602;DWG 111A1511;111A1000;11A1001 AND SRM 51-40-05-0G-0. OK TO INSTALL.; [05] INSTALLED NEW DOUBLER AT VAPOR BARRIER BS663 LBL6-31 IAW DWG 111A1511;111A1000;11A1001 AND SRM 51-40-02-0G-0.; [06] VERIFIED FABRICATION; LOCATE-AND-DRILL AND CHEM CONVERSION COATING AND PRIMER; VERIFIED INSTALLATION OF NEW DOUBLER AT VAPOR BARRIER BS663 LBL6-31 IAW DWG 111A1511;111A1000;11A1001 AND SRM 51-40-02-0G-0; [07] VERIFIED ALL WORK COMPLETED THIS TASK

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