SDR SWAA2025120126923

Service difficulty report · Sill Drain · Boeing 7377H4

Difficulty date: October 22, 2025
Submitted: December 1, 2025
Operation: Air carrier
Aircraft: N234WN
Make and model: Boeing 7377H4
Aircraft serial: 32502
Aircraft time: 64,044 hours, 38,686 cycles
System (JASC): 5310 · Fuselage Main, Structure
Part: Sill Drain
Condition: Corroded
Location: Zone 200
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 UPPER MAN SILL LOCATED BS 440 TO BS 492.5 ABOVE S-19R WL 190 FWD CARGO COMPARTMENT. REPLACED NEW UPPER MAN SILL LOCATED BS 440 TO BS 492.5 ABOVE S-19R WL 190 FWD CARGO COMPARTMENT IAW SRM 51-40-02, SRM 51-10-02, DWG 143A8110, SHEET 20, REV -, AND DWG 143A0081, SHEET 1, REV C.

More about the Boeing 737-7H4