Service difficulty report · Rib · Boeing 7377H4

Difficulty date
April 5, 2025
Submitted
May 5, 2025
Operation
Air carrier
Aircraft
N221WN
Make and model
Boeing 7377H4
Aircraft serial
34259
Aircraft time
65,130 hours, 38,662 cycles
Part
Rib
Condition
Cracked
Location
Zone 300
Stage of operation
IN
How discovered
V
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 LOWER SIDE LOC. ON FRONT SPAR RIB 120.30 AT LT HORIZONTAL STABILIZER 2025-224531<[01] TOOL USED ON ITEM 3 AND 4: EDDY CURRENT FLAW DETECTOR; P/N: NORTEC 600D; S/N: 60007161486; DUE DATE: 06-SEP-25;[02] TOOLS USED: TEMPERATURE CONTROLLER: P/N: P3015GOES00000; S/N: 142811020; DUE DATE: 29-JAN-26. TEMPERATURE CONTROLLER: P/N: P3015GOES00000 S/N: 112820025 DUE DATE: 28-JAN-26.;[03] REJECTED STEP 9 DUE TO INCORRECT BEND PROCESS ON REPAIR ANGLE [2];[04] VERIFIED MINIMUM BENT RADIUS ON ANGLE LOWER SIDE LOC. ON FRONT SPAR RIB 120.30 AT LT HORIZONTAL STABILIZER IAW SRM B737-700 51-30-01 FIGURE 3 TABLE A; SHEET 1; TOOL USED: PRECISION RADIUS GAUGE P/N: S167C S/N: AE-28535 DUE DATE: 04-SEP-25;[05] RIIRJCT RESOLUTION<BR>VERIFIED MINIMUM BENT RADIUS ON ANGLE LOWER SIDE LOC. ON FRONT SPAR RIB 120.30 AT LT HORIZONTAL STABILIZER IAW SRM B737-700 51-30-01 FIGURE 3 TABLE A; SHEET 1; FOUND WITHIN TOLERANCE.;[06] TOOL USED: RADIOMETER/PHOTOMETER KIT; P/N XRP-3000; S/N: 1753759; DUE DATE: 30-JUN-25.;[07] REPAIRED INSPAR RIB LOWER SIDE LOC. ON FRONT SPAR RIB 120.30 AT LT HORIZONTAL STABILIZER IAW B737-700 SRM: 55-10-09-2R-5 REPAIR 5. SEE INDIVIDUAL SIGN OFF BELOW.;[08] REPAIRED INSPAR RIB LOWER SIDE LOC. ON FRONT SPAR RIB 120.30 AT LT HORIZONTAL STABILIZER IAW B737-700 SRM: 55-10-09-2R-5 REPAIR 5. SEE INDIVIDUAL SIGN OFF BELOW<BR>RII

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