Service difficulty report · Stiffener · Boeing 7377H4

Difficulty date
August 8, 2023
Submitted
August 24, 2023
Operation
Air carrier
Aircraft
N413WN
Make and model
Boeing 7377H4
Aircraft serial
29819
Aircraft time
72,820 hours, 42,792 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

CRACK INDICATION ON L/H H-STAB RIB #7 STIFFENER #4 UPPER RADIUS.<[01] REJECTED: L/H H-STAB RIB #7 STIFFENER #4 UPPER RADIUS CRACKED: THE SRM APPLICABILITY VALIDATION FOR REPAIR; AND NDT/VISUAL INSPECTIONS NOT PERFORMED AFTER DAMAGE REMOVAL. GENERATED TTG8Q00MUDHM;[02] CORRECTIVE ACTION 1; L/H H-STAB RIB #7 STIFFENER #4 UPPER RADIUS CRACKED: THE SRM APPLICABILITY VALIDATION FOR REPAIR; AND NDT/VISUAL INSPECTIONS NOT PERFORMED AFTER DAMAGE REMOVAL.<BR>IS CORRECTED ON STEPS:<BR>-SRM APPLICABILITY ON STEP 4.<BR>-NDT PERFORMED ON STEP 3.<BR>-GVI PERFORMED ON STEP 8.;[03] VERIFIED CORRECTIVE ACTION 2<BR>TTG8Q00MUDHM COMPLETE;[04] REMOVED THE DAMAGE PART AT DISCREPANCY AREA AND INSTALLED REPAIR PARTS IAW SRM 55-10-09-2R-4;[05] REMOVED THE DAMAGE PART AT DISCREPANCY AREA AND INSTALLED REPAIR PARTS IAW SRM 55-10-09-2R-4.<BR>MEASUREMENT TABLE UPDATED;[06] VERIFIED CORRECTIVE ACTION #5.;[07] VERIFIED MEASUREMENTS.

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