Service difficulty report · Doubler · Boeing 7377H4

Difficulty date
June 29, 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 R/H BS 663 VAPOR BARRIER AT RBL 25 WL 146 ; / [01] RECEIVED FROM OSS NEW DOUBLER VERIFIED HEAT TREATMENT AND FABRICATION IAW DWG 111A1511-28 AND BAC 5602 MAT. USED 2024 T42 0.040' LOT#1453744-1; LOCATED AND DRILLED;APPLIED CHEMICAL CONVERSION COATING AND PRIMER IAW SRM 51-40-05-0G-0 AND DWG 111A1000.; [02] OK TO INSTALL.; [03] VERIFIED CORRECTIVE ACTION ITEM 1. SEE PO NO. 828953-SWA FOR FABRICATION AND HEAT TREAT.<BR><BR>OK TO INSTALL; [04] INSTALLED 100% OF TEMPORARY FASTENERS ON DOUBLER REPLACEMENT AREA BEFORE SQUEEZE OUT TIME EXPIRE SEALANT BMS 5-95 C-20 MIXED 17:50 HRS 02/JUL/21; TIME EXPIRE 03/JUL/21 13:50 HRS. IAW SOPM 20-50-19.; [05] VERIFIED DOUBLER AREA FASTENERS BEFORE SQUEEZE OUT; [06] INSTALLED DOUBLER AT BS 663 RBL 6-25 IAW SRM 51-40-02-0G-0 AND DWG 111A1001;111A1000.; [07] RII VERIFIED INSTALLED; [08] ALL STEPS COMPLETED FOR DOUBLER ON FWD SIDE RH BS 663 VAPOR BARRIER RBL25 WL146.; [09] VERIFIED RII STEPS COMPLETE; [10] VERIFIED ALL STEPS COMPLETE.

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