Service difficulty report · Stiffener · Boeing 73776Q

Difficulty date
April 12, 2023
Submitted
May 9, 2023
Operation
Air carrier
Aircraft
N551WN
Make and model
Boeing 73776Q
Aircraft serial
30280
Aircraft time
66,624 hours, 41,198 cycles
Part
Stiffener
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 INDICATIONS ON L/H H-STAB RIB 4 STIFFENERS 2 & 3 LOWER RADII.<REMOVED THE DAMAGED PART AT LH HORIZONTAL STABILIZER STA 120.30 RIB 2ND AND 3RD VERTICAL STIFFENER IAW SRM 55-10-09-2R-4;[03] HFEC REQUEST ON 2ND AND 3RD VERTICAL STIFFENER ON CUT OUT EDGES; WEB AND EXISTING FASTENERS HOLES WITHIN THE REPAIR AREA TO ENSURE NO CRACKS EXIST.;[04] PERFORMED GVI OF ALL AREAS WITHIN THE REPAIR AREA; NO DEFECTS NOTED IAW SRM 55-10-09-2R-4 STEP E.;[05] VERIFIED CORRECTIVE ACTION 1;2 AND 4.; FABRICATED REPAIR PARTS FOR STIFFENERS 2 AND 3; (1) T-SECTION FROM 60-5872 7075 T76511 LOT# 1449876-1 (2) ANGLE FROM BAC 1490-2793 7075 T62 CLAD LOT# 1442205-1 (3) SHIM FROM 7075 T6 0.020' CLAD LOT# 1381332-1; APPLIED CHEMICAL CONVERSION COATING IAW SRM 55-10-09-2R-4 OK TO PRIME.;[08] VERIFIED CORRECTIVE ACTION 7.<BR>OK TO PRIME;[09] PRIMED REPAIR PARTS FOR STIFFENERS 2 AND 3 AND COMMON AREA IAW SRM 55-10-09-2R-4 OK TO INSTALL.;[10] VERIFIED CORRETIVE ACTION 9.<BR>OK TO INSTALL;[11] INSTALLED REPAIR PARTS ON STIFFENERS 2 AND 3 AT LH HORIZONTAL STABILIZER STA 120.30 RIB IAW SRM 55-10-09-2R-4;[12] RII VERIFIED CORRECTIVE ACTION ITEM 11.;[13] VERIFIED CORRECTIVE ACTION ITEMS AND MEASUREMENT FIELDS; CARD COMPLETE.

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