Service difficulty report · Stiffener · Boeing 7377H4

Difficulty date
May 29, 2022
Submitted
June 16, 2022
Operation
Air carrier
Aircraft
N253WN
Make and model
Boeing 7377H4
Aircraft serial
32511
Aircraft time
53,013 hours, 31,527 cycles
Part
Stiffener
Condition
Cracked
Location
Lh Hor 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

LH HORIZONTAL STABILIZER;#5 RIB STAB. STA 129.50 HAS CRACK AT STIFFENER 4;LOWER POSITION. / REMOVED DAMAGE AT L/H HORIZONTAL STAB. RIB #5 STIFFENER #4 PER REF B737-700 SRM 55-10-09-2R-4-REPAIR 4 AND SRM 51-10-02-0G-0. FINAL TRIM OUT LENGTH 1.800' PER FIGURE 202-SHEET 3FABRICATED REPAIR ANGLE FROM BAC1490 7075-T6 CLAD SHEET OF 0.063'; FILLER MADE FROM 7075-T6 CLAD SHEET OF 0.063' AND ONE SHIM MADE FROM 7075-T6 CLAD SHEET OF 0.020' PER REF B737-700 SRM 55-10-09-2R-5-REPAIR 5-TABLE 201; LOCATED AND DRILLED REPAIR AREA AND REPAIR PARTS PER B737-700 SRM 55-10-09-2R-5; FIGURE 204; SHEET 1; TREATED AND PRIMED REPAIR PARTS AND REPAIR AREA PER B737-700 AMM 51-21-72-370-804 AND AMM 51-21-41-370-801 INSTALLED REPAIR PARTS ON RIB #5 STIFFENER #4 AT L/H HORIZONTAL STAB. STA 129.50 PER B737-700 SRM 55-10-09-2R-5-REPAIR 5; FIGURE 204; SHEET 1FABRICATED REPAIR ANGLE FROM BAC1490 7075-T6 CLAD SHEET OF 0.063'; FILLER MADE FROM 7075-T6 CLAD SHEET OF 0.063' AND ONE SHIM MADE FROM 7075-T6 CLAD SHEET OF 0.020' PER REF B737-700 SRM 55-10-09-2R-5-REPAIR 5-TABLE 201. LOCATED AND DRILLED REPAIR AREA AND REINSTALLED REPAIR PARTS ON RIB #5 STIFFENER #4 AT L/H HORIZONTAL STAB. STA 129.50 PER B737-700 SRM 55-10-09-2R-5-REPAIR 5; FIGURE 204; SHEET 1. INSTALLED REPAIR PARTS ON RIB #5 STIFFENER #4 AT L/H HORIZONTAL STAB. STA 129.50 PER B737-700 SRM 55-10-09-2R-5-REPAIR 5; FIGURE 204; SHEET 1

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