Service difficulty report · Doubler · Boeing 7377H4

Difficulty date
June 29, 2023
Submitted
August 29, 2023
Operation
Air carrier
Aircraft
N297WN
Make and model
Boeing 7377H4
Aircraft serial
32542
Aircraft time
51,861 hours, 31,224 cycles
Part
Doubler
Part number
UNKNOWN
Condition
Cracked
Location
Zn 500 Left Wing
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 AROUND THE FASTENER AT NO.1 SLAT LOWER SURFACE OF THE L/E SLAT NOSE SKIN AT ACTUATOR RIBS. MARKED<[01] APPLICABILITY REPAIR STATEMENT; APPLICABLE REPAIR FOR CRACK AROUND THE FASTENER AT NO.1 SLAT LOWER SURFACE OF THE L/E SLAT NOSE SKIN AT ACTUATOR RIBS MARKED IS SRM 57-42-01-2R-8 REPAIR 8.;[09] FABRICATED REPAIR (1) DOUBLER 7075-T6 0.071' THICK LOT #1497836-1; (2) FILLER 7075-T6 0.063' THICK LOT #1498631-1 IAW SRM 57-42-01-2R-8 STEP 4.F(1.A - C; 3.A - G) & 4 - 8.;[15] INSTALLED REPAIR PARTS WITH PERMANENT AND TEMPORARY FASTENERS BEFORE SEALANT SQUEEZE-OUT TIME OF 07/08/23 @ 06:00HRS IAW PSDS BAC5000.INSTALLED REPAIR PARTS IAW SRM 57-42-01-2R-8 STEP 4.F.(10).;[19] INSTALLED FLEX SKIN COMMON TO #1 SLAT ACTUATOR; APPLIED AERODYNAMIC SMOOTHNESS FILLET SEAL AROUND THE DOUBLER AND FLEX SKIN AND INSTALLED COVE PANELS 525DAB;525DBB;525CB & 525EB IAW SRM 57-42-01-2R-8 STEP 4.H.J.K & L. SCREW GUN ID:ATS2314; CAL DUE 09/2023.;[20] VERIFIED CORRECTIVE ACTION #19;[21] MAINTENANCE NOTE; ACTION 15 WAS ONLY TO VERIFY ALL HOLES WERE FILLED; I DIDN'T BUY THE FASTENERS. INSTALLATION IS REJECTED DUE TO BLIND FASTENERS ARE PULLED INCORRECTLY. SEE STEP 1;[22] ALL OTHER PERMANENT FASTENERS INSTALLED ON REPAIR PARTS; (1)DOUBLER AND (2) FILLER IAW SRM 57-42-01-2R-8.STEP 4.F.(10).;[23] VERIFIED STEP 1; CORRECTIVE ACTION 22 AND MEASUREMENT TABLE.

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