SDR SWAA2022020457914

Service difficulty report · Floorbeam · Boeing 7377H4

Difficulty date: January 4, 2022
Submitted: February 4, 2022
Operation: Air carrier
Aircraft: N452WN
Make and model: Boeing 7377H4
Aircraft serial: 29846
Aircraft time: 60,081 hours, 35,724 cycles
System (JASC): 5320 · Fuselage Miscellaneous Structure
Part: Floorbeam
Part number: 147A55068
Condition: Corroded
Stage of operation: UK
How discovered: 9
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 AROUND FASTENER HOLES ON FLOORBEAM UPPER FLANGE BS 986.5, RBL 28'-46'. EVALUATED REWORKED AREA ORG. MAT.0.150' MAT REMAINING 0.100' MAT REMOVED 0.050' FOUND TO BE OUT OF LIMITS IAW SRM=53-70-51-11A-1. LOCATED AND DRILLED HOLES IAW B737 SRM 53-70-51-2R-4 REPAIR4, FIG204, SHEET 2. REPAIRED IAW SRM 51-40-05-0G-0 AND 53-70-51-2R-4 REPAIR 4.

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