SDR SWAA2023011185421

Service difficulty report · Doubler · Boeing 7377H4

Difficulty date: December 26, 2022
Submitted: January 11, 2023
Operation: Air carrier
Aircraft: N933WN
Make and model: Boeing 7377H4
Aircraft serial: 36640
Aircraft time: 44,739 hours, 27,195 cycles
System (JASC): 5312 · Fuselage Main, Bulkhead
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

DOUBLER COMMON TO THE FWD SIDE OF THE VAPOR BARRIER IS CRACKED AT BS 663, LBL 25, WL 177. FOUND TO BE OUT OF LIMITS. FABRICATED AND APPLIED CHEMICAL CONVERSION COATING AND PRIMER ON A NEW DOUBLER IAW DWG 111A1000, DWG 111A1511, SRM 51-40-05-0G-0, SRM 51-30-01-0G-0, SRM 51-20-01, & 51-10-02-0G-0. DOUBLER INSTALLED ON FAULT TTG8Q00GRPT1, STEP 5.

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