Service difficulty report · Support · Boeing 7377H4

Difficulty date
July 10, 2025
Submitted
August 6, 2025
Operation
Air carrier
Aircraft
N912WN
Make and model
Boeing 7377H4
Aircraft serial
36621
Aircraft time
57,027 hours, 34,448 cycles
Part
Support
Condition
Corroded
Location
Zone 100
Stage of operation
IN
How discovered
V
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

CORROSION ON FLOOR TO SIDEWALL SUPPORT AT FCB BS480 - BS500B LBL23 WL156. REMOVED AND REPLACED SIDEWALL SUPPORT BS396 TO BS500D LBL23 WL156 IAW SRM 51-40-02-0G-0 AND DWG 143A7500 REV: -;[02] REJECTION OF STEP 4 ITEM 4: FWD BULKHEAD LOWER SUPPORT INSTALLED WITH INCORRECT FASTENERS COMMON TO FLOOR STRUCTURE AND STANCHIONS. DRAWING 284A0603 CALLS FOR BACN10YR3CD NUTS WITH WASHERS. INSTALLED FASTENERS AND WASHER AT FWD BULKHEAD LOWER SUPPORT BS396 RBL22 TO LBL22 WL156 IAW SRM 51-40-02-0G-0 AND DWG# 284A0603 REV:-.

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