Service difficulty report · Stiffener · Boeing 7377H4

Difficulty date
June 20, 2023
Submitted
July 17, 2023
Operation
Air carrier
Aircraft
N417WN
Make and model
Boeing 7377H4
Aircraft serial
29822
Aircraft time
71,145 hours, 42,399 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

LEFT HORIZONTAL STABILIZER RIB 2ND STIFFENER IS CRACKED AT STAB STA 129.50<[01] REMOVED THE DAMAGED PART AT LH HORIZONTAL STABILIZER STA 129.50 RIB 2ND VERTICAL STIFFENER IAW SRM 55-10-09-2R-4;[02] HFEC REQUEST ON THE CUT OUT EDGES; WEB AND EXISTING FASTENERS HOLES WITHIN THE REPAIR AREA TO ENSURE NO CRACKS EXIST.;[03] VERIFIED CORRECTION ACTION ITEM 1.;[04] HFEC INSPECTED CUTOUT AREA IAW 737 NDTM PART 6; 51-00-00 PROCEDURE 23.<BR>CRACK NOTED; MARKED LOCATION.<BR><BR>HFEC INSPECTED OPEN HOLES IAW 737 NDTM PART 6; 51-00-00 PROCEDURE 16.<BR>CRACKS NOTED; MARKED LOCATIONS.<BR><BR>EQUIP USED:<BR>-NORTEC 600 ID: ATS1465 CAL DUE: 09/23;[05] TRIMMED OUT THE DAMAGED PART OF THE LOWER FLANGE AT LH HORIZONTAL STABILIZER STA 129.50 RIB 2ND VERTICAL STIFFENER IAW SRM 55-10-09-2R-5;[06] HFEC REQUEST ON THE CUT OUT EDGES OF THE LOWER FLANGE AT LH HORIZONTAL STABILIZER STA 129.50 RIB 2ND VERTICAL STIFFENER TO ENSURE NO CRACKS EXIST.10] FABRICATED REPAIR PARTS (1) T-SECTION FROM 60-5872 7075 T76511 LOT# 1463618-1 (2) ANGLE FROM BAC 1490-2793 7075 T62 CLAD LOT# 1442205-1 (3) FILLER FROM 7075 T6 0.050' CLAD LOT# 1300812-1 (4) SHIM FROM 7075 T6 0.020' CLAD LOT# 1381332-1; APPLIED CHEMICAL CONVERSION COATING IAW SRM 55-10-09-2R-5 OK TO PRIME.;

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