Service difficulty report · Floorbeam · Boeing 7377H4

Difficulty date
August 6, 2026
Submitted
September 10, 2026
Operation
Air carrier
Aircraft
N931WN
Make and model
Boeing 7377H4
Aircraft serial
36637
Aircraft time
56,214 hours, 34,452 cycles
Part
Floorbeam
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 FOUND ON THE TOP AND UNDERSIDE AFT (WET AREA) FLOOR STRUCTURE AT RBL 30, BS 986, WL 208. EVALUATED CORROSION ON BS 986, RBL 30, WL 208 FLOORBEAM UPPER FLANGE, ORIGINAL MATERIAL THICKNESS IS 0.150" LOWEST REMAINING MATERIAL IS 0.120" DAMAGE FOUND TO BE OUT LIMITS IAW SRM 53-70-51-1A-1, ALLOWABLE DAMAGE 1, PARA 4.D(2)(A) FIGURE 103, ALLOWABLE DAMAGE 1, DETAIL E, REPAIR TO BE PERFORM AND RECORDED ON CCN TTG8Q01DKS4G.

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