SDR DALA2025111708382

Service difficulty report · Bulkhead · Boeing 757251

Difficulty date: November 14, 2025
Submitted: November 17, 2025
Operation: Air carrier
Aircraft: N557NW
Make and model: Boeing 757251
Aircraft serial: 33393
Aircraft time: 64,537 hours, 29,284 cycles
System (JASC): 5312 · Fuselage Main, Bulkhead
Part: Bulkhead
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

SHIP 5657 FLC AFT BULKHEAD, AT STA-900 & BETWEEN S-27L & S-27R, ELBOW BELOW THE 7 VERTICAL STIFNEER FROM THE RH, & APPROX 7.5 INCHES FROM RBBL, FOUND CORROSION BETWEEN THE VERTICAL BEAM & SKIN JOINT, MEASURING UPWARD APPROX 4 INCHES. CORRECTIVE ACTION: REMOVED AND REPLACED VERTICAL STIFFENER AT STA 900 BETWEEN S-27L & S-27R IAW B757 SRM 51-40-03-06 PARA 6 PER PRI 630102-14 REV 1 AND DELTA ERIA 630102-14 REV O. (1306173)