SDR SWAA2025122942805

Service difficulty report · Stiffener · Boeing 7377H4

Difficulty date: December 5, 2025
Submitted: December 29, 2025
Operation: Air carrier
Aircraft: N470WN
Make and model: Boeing 7377H4
Aircraft serial: 33860
Aircraft time: 71,125 hours, 42,675 cycles
System (JASC): 5320 · Fuselage Miscellaneous Structure
Part: Stiffener
Condition: Cracked
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

VERTICAL STIFFENER CRACKED BS 540, LBL 24 UPPER SECTION. REFER TO FAULT TTG8Q0197Q2R WHERE EA 25-157-03419 WAS ADDED AS A SUBTASK. C/W REPLACEMENT STIFFENER AT LBL 24 IAW SRM 51-40-02-0G-0 & DWG 111A2001 REV -. REMOVED AND REPLACED VERTICAL STIFFNER AT BS 540 LBL 24 IAW SRM 51-40-02-0G-0, AND DWG 111A2001 REV-.

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