Service difficulty report · Rib · Boeing 7377H4

Difficulty date
June 11, 2026
Submitted
June 23, 2026
Operation
Air carrier
Aircraft
N478WN
Make and model
Boeing 7377H4
Aircraft serial
33989
Aircraft time
71,646 hours, 43,008 cycles
Part
Rib
Part number
174A11081
Condition
Cracked
Location
Zone 300
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

UPON INSTALL OF DORSAL FIN; FOUND FORWARD MOUNT POINT(S) BRACKET CRACKED. APPLIED ALODINE IAW SRM 51-20-01. REMOVED CRACKED RIB IAW SRM 51-40-02 FABRICATED A NEW -1 RIB IAW DWG 174A1108 REV -, LOCATED AND DRILLED RIB IAW DWG 174A1008, REV B AND SRM 51-40-10. ALODINED AND PRIMED IAW SRM 51 -20-01.

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