Service difficulty report · Stiffener · Boeing 7377H4

Difficulty date
March 9, 2022
Submitted
April 11, 2022
Operation
Air carrier
Aircraft
N468WN
Make and model
Boeing 7377H4
Aircraft serial
33858
Aircraft time
58,378 hours, 34,580 cycles
Part
Stiffener
Condition
Cracked
Location
L/H Horiz. 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

LT HORIZONTAL STAB AT RIB 120.3; #1 STIFFENER IS CRACKED AT THE LOWER END LT STAB L/E @ STAB STA 120.3 / [01] REMOVED LEFT HORIZONTAL STABILIZER RIB AT STAB STA 120.30 TO ACCESS RIB REPAIR IAW SRM 51-40-02-0G-0.[08] FABRICATED REPAIR PARTS; T-SECTION 7075-T76511 0.063' THICK LOT# 1463618-1; ANGLE BAC1490-7075-T62 0.063' THICK LOT# 1464923-1 AND SHIM 2(EA) 7075-T6 0.016' THICK LOT# 1439717-1 IAW SRM 55-10-09-2R-4 STEP 4.F - J.;[09] APPLIED CHEMICAL CONVERSION COATING TO REPAIR PARTS; BARE SURFACES AND CUT EDGES OF THE RIB IAW SRM 55-10-09-2R-4 STEP 4.K. OK TO PRIME.;[10] VERIFIED CORRECTIVE ACTIONS 7;8 AND 9.;[11] APPLIED PRIMER TO REPAIR PARTS; BARE SURFACES AND CUT EDGES OF THE RIB IAW SRM 55-10-09-2R-4 STEP 4.L. OK TO INSTALL.;[12] VERIFIED CORRECTIVE ACTION 11.;[13] INSTALLED REPAIR PARTS AND APPLIED FILLET SEAL TO REPAIR PARTS IAW SRM 55-10-09-2R-4 STEP 4.M - Q.;[14] VERIFIED CORRECTIVE ACTION 13.;[15] CORRECTION TO N/A STATEMENT.;[16] OK TO INSTALL RIB GIVEN.;[17] INSTALLED RIGHT HAND HORIZONTAL STABILIZER INSPAR RIB AT STAB STA 120.30 IAW SRM 51-40-02-0G-0 AND BAC DRAWINGS # 002A0001; 182A3001 AND 182A1500.;[18] VERIFIED CORRECTIVE ACTION 17.;[19] APPLIED DECORATIVE EXTERIOR PAINT ON LOWER AND UPPER SKIN SURFACES OF LEFT HAND HORIZONTAL STABILIZER AT STAB RIB STA 120.30 IAW AMM 51-21-99-300-801.;[20] VERIFIED CORRECTIVE ACTION 19.;[21] VERIFIED ALL STEPS COMPLETE.

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