Service difficulty report · Intercostal · Boeing 7377H4

Difficulty date
August 6, 2026
Submitted
September 11, 2026
Operation
Air carrier
Aircraft
N931WN
Make and model
Boeing 7377H4
Aircraft serial
36637
Aircraft time
56,214 hours, 34,452 cycles
Part
Intercostal
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 TOP AFT (WET AREA) FLOOR STRUCTURE AT LBL 32 BS 996 WL 208. EVALUATED CORROSION ON BS986-BS1006 LBL34 WL208 INTERCOSTAL AT BS 996 LBL32 WL208 ORIGINAL MATERIAL THICKNESS IS 0.080" LOWEST REMAINING MATERIAL IS 0.056", DAMAGE FOUND TO BE OUT LIMIT REMOVE LOCATED AND DRILLED PART TO BE INSTALLED ON CCN TTG8Q01DKS4G STEP 18

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