Service difficulty report · Sill Drain · Boeing 757251

Difficulty date
October 22, 2025
Submitted
October 24, 2025
Operation
Air carrier
Aircraft
N557NW
Make and model
Boeing 757251
Aircraft serial
33393
Aircraft time
64,537 hours, 29,284 cycles
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 THE CREASE BEAM AKA "MOP SEAL" AKA (THE O/B SUPPORT FOR THE O/B CABIN FLOOR PANEL), ON THE RIGHT SIDE FROM STA.1455 TO STA.1485. CORRECTIVE ACTION: CREASE BEAM HAS BEEN FOUND TO BE OUT OF LIMITS PER SRM 53-60-13- 1A-1 DETAIL VIII. NOMINAL .090 REMOVED .020 REPAIRED CREASE BEAM IAW B757-200 SRM 51-70-12. (1266173)