Service difficulty report · Stiffener · Boeing 7377H4

Difficulty date
August 16, 2023
Submitted
September 19, 2023
Operation
Air carrier
Aircraft
N447WN
Make and model
Boeing 7377H4
Aircraft serial
33720
Aircraft time
64,361 hours, 38,208 cycles
Part
Stiffener
Part number
UNKNOWN
Condition
Cracked
Location
Zn 300 Stabilize
Stage of operation
IN
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

FOUND CRACK AT RIB #4 STIFFENER #2 LOWER SIDE AT RIGHT HORIZONTAL STAB<[01] ACCOMPLISHED REPAIR PER SRM 55-10-09-2R-4 REPAIR 4;[02] CORRECTED STEP 1. ACCOMPLISHED REPAIR AT RIB #4 STIFFENER #2 LOWER SIDE AT RIGHT HORIZONTAL STAB PER SRM 55-10-09-2R-4 REPAIR 4;[03] VERIFIED STEP 2; REPAIR ACCOMPLISHED AND 100% FASTENER INSTALLATION BY SQUEEZE OUT TIME.

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