SDR SWAA2026022468971

Service difficulty report · Threshold · Boeing 7377H4

Difficulty date: February 8, 2026
Submitted: February 24, 2026
Operation: Air carrier
Aircraft: N948WN
Make and model: Boeing 7377H4
Aircraft serial: 36662
Aircraft time: 50,176 hours, 30,817 cycles
System (JASC): 5320 · Fuselage Miscellaneous Structure
Part: Threshold
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 FCB DOOR CUTOUT SURROUND THRESHOLD BS 440+15; 460+10, RBL 28, WL 156. REPLACED FCB DOOR CUTOUT SURROUND THRESHOLD STA 440-492.4; RBL 28; 156 IAW SRM 51-10-02-0G-0, SRM 53-30-15-1A-1, SRM 51-40-02-0G, AMM 51-21-73-370-801, AMM 51-21-72-370-804, & DWG 143A8330, REV A.

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