Service difficulty report · Stiffener · Boeing 7377H4

Difficulty date
July 26, 2021
Submitted
September 15, 2021
Operation
Air carrier
Aircraft
N447WN
Make and model
Boeing 7377H4
Aircraft serial
33720
Aircraft time
58,733 hours, 34,620 cycles
Part
Stiffener
Condition
Cracked
Location
Horizontal Stab
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 HAND HORIZONTAL STABLILIZER INSPAR RIB; STATION 120.3; 2ND VERTICAL STIFFENER IS CRACKED. ; / [01] REMOVED THE DAMAGED PART AT LH HORIZONTAL STABILIZER STA 120.30 RIB 2ND VERTICAL STIFFENER IAW SRM 55-10-09-2R-4; [02] UPDATED CHART MEASUREMENTS; [03] VERIFIED MEASUREMENTS; [04] VERIFIED DAMAGE REMOVED PER SRM 55-10-09-2R-4; [05] HFEC REQUEST ON THE CUT OUT EDGES; WEB AND EXISTING FASTENERS HOLES WITHIN THE REPAIR AREA TO ENSURE NO CRACKS EXIST.; [07] FABRICATED REPAIR PARTS (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 FABRICATION REPAIR PARTS AND APPLIED CHEMICAL CONVERSION COATING PER SRM 55-10-09-2R-4. OK TO PRIMED. ALSO; PERFORMED GVI OF ALL AREAS WITHIN THE REPAIR AREA AND NO DEFECT NOTED.; [09] PRIMED REPAIR PARTS AND COMMON AREA IAW SRM 55-10-09-2R-4 OK TO INSTALL.; [10] VERIFIED PRIMED REPAIR PARTS AND COMMON AREA IAW SRM 55-10-09-2R-4 OK TO INSTALL.; [11] INSTALLED REPAIR PARTS AT L/H INSPAR RIB 120.3 2ND VERTICAL STIFFENER IAW SRM 55-10-09-2R; [12] INSTALLED REPAIR PARTS AT L/H INSPAR RIB 120.3 2ND VERTICAL STIFFENER IAW SRM 55-10-09-2R-4;

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