SDR SWAA2026072018354

Service difficulty report · Threshold Web · Boeing 7377H4

Difficulty date: June 10, 2026
Submitted: July 21, 2026
Operation: Air carrier
Aircraft: N257WN
Make and model: Boeing 7377H4
Aircraft serial: 32515
Aircraft time: 65,106 hours, 39,315 cycles
System (JASC): 5320 · Fuselage Miscellaneous Structure
Part: Threshold Web
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 FWD CARGO BAY SUB THRESHOLD WEB MULTIPLE AREAS AROUND NUT PLATE HOLES BS 440+5' - 490, RBL 26, WL156. CORROSION ON FWD CARGO BAY SUB THRESHOLD WEB FOUND TO BE OUT OF LIMITS. REMOVED, REPLACED, AND INSTALLED A NEW FWD CARGO BAY SUB THRESHOLD WEB IAW SRM 53-30-15-1A-1, SRM 51-40-02-0G-0, SRM 51-40-05-0G-0, AND DWG 143A8330, REV A.

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