Service difficulty report · Rib · Boeing 7377H4

Difficulty date
December 14, 2022
Submitted
December 29, 2022
Operation
Air carrier
Aircraft
N401WN
Make and model
Boeing 7377H4
Aircraft serial
29813
Aircraft time
73,533 hours, 43,472 cycles
Part
Rib
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

CRACK INSPAR RIB LOC LE STA 120.30 AND 35 INCH FRONT SPAR AT RT HORIZONTAL STABILIZER AT RT HORIZONTAL STABILIZER 2022-688563<[01] TOOL USED: EDDY CURRENT FLAW DETECTOR; P/N: NORTEC 600D; S/N: 200053402 DUE DATE: 13-MAY-23;[02] PERFORMED PERMANENT REPAIR LOC INSPAR RIB LOC LE STA 120.30 AND 35 INCH FRONT SPAR AT RT HORIZONTAL STABILIZER AT RT HORIZONTAL STABILIZER IAW B737-700 SRM 51-40-02 AND SRM 55-10-09-2R-5 REPAIR 5; STEP 4; P; Q; R; S FIGURE 204; SHEET 1. MATERIAL USED: T-SECTION KIT: 55100003-01; ANGLE MATERIAL USED: BAC1490-2738; PO: 2022-127681; FILLER MATERIAL USED: 7075-T6 0.063? PO: 2020-203089 AND SHIM (2 E/A) MATERIAL USED: 7075-T6 0.020? PO: 2021-203786. CRACK LENGTH IS: 0.448 INCHES. TOOL USED: DIGITAL CALIPER P/N: 500-197-30; S/N: A21143495; DUE DATE: 29-JUN-23. SEE INDIVIDUAL SIGNS-OFF BELOW.;[03] PERFORMED PERMANENT REPAIR LOC INSPAR RIB LOC LE STA 120.30 AND 35 INCH FRONT SPAR AT RT HORIZONTAL STABILIZER AT RT HORIZONTAL STABILIZER IAW B737-700 SRM 51-40-02 AND SRM 55-10-09-2R-5 REPAIR 5; STEP 4; P; Q; R; S FIGURE 204; SHEET 1. MATERIAL USED: T-SECTION KIT: 55100003-01; ANGLE MATERIAL USED: BAC1490-2738; PO: 2022-127681; FILLER MATERIAL USED: 7075-T6 0.063? PO: 2020-203089 AND SHIM (2 E/A) MATERIAL USED: 7075-T6 0.020? PO: 2021-203786. CRACK LENGTH IS: 0.448 INCHES. TOOL USED: DIGITAL CALIPER P/N: 500-197-30; S/N: A21143495; DUE DATE: 29-JUN-23. SEE INDIVIDUAL SIGNS-OFF BELOW.<BR>RII

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