Service difficulty report · Stringer · Boeing 73779P

Difficulty date
May 17, 2023
Submitted
June 20, 2023
Operation
Air carrier
Aircraft
N7820L
Make and model
Boeing 73779P
Aircraft serial
28253
Aircraft time
58,307 hours, 37,562 cycles
Part
Stringer
Part number
UNKNOWN
Condition
Cracked
Location
Zn 100 Fus Lower
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 STRINGER 25L BS 540 AT FWD CARGO COMPARTMENT 2023-330241<[01] EQUIPMENT P/N 45MG; S/N 130063701; DUE DATE 16-JUN-23 WAS USED;[02] REPAIR -7 STRINGER SECTION (1EA) MATERIAL P/N 7075-T0/0.036?; HEAT TREATED AND CONVERTED FROM 7075-T0 TO CONDITION T6; IAW BAC5602 TABLE IV PAGE 22 AND TABLE X PAGE 33. TOOL USED: TEMPERATURE CONTROLLER P/N P3015GOES00000 S/N 142811020 DUE DATE: 25-JAN-24. TEMPERATURE CONTROLLER P/N P3015GOES00000 S/N 142811019 DUE DATE: 25-JAN-24.;[03] CORRECTED CORRECTIVE ACTIONS STEP 2: <BR>TOOL USED: TEMPERATURE CONTROLLER P/N P3015GOES00000 S/N 142811020 DUE DATE: 25-JAN-24. TEMPERATURE CONTROLLER P/N P3015GOES00000 S/N 142811019 DUE DATE: 25-JAN-24;[04] TOOL USED ET EQUIPMENT: P/N: NORTEC 500D; S/N: N500X12101V022233; CAL DUE DATE: 30-AUG-23;[05] PERFORMED REPAIR STRINGER 25L LOC STRINGER 25L BTW BS500D TO BS540 IAW B737-700 SRM 53-00-03-3R-1 REPAIR 1 PARAGRAPH 4.K AND SRM 51-40-02 <BR>SEE INDIVIDUAL SIGN OFF BELOW;[06] CORRECTED STEP 5.<BR>PERFORMED REPAIR STRINGER 25L LOC STRINGER 25L BTW BS500D TO BS540 IAW B737-700 SRM 53-00-03-2R-1 REPAIR 1 PARAGRAPH 4.K AND SRM 51-40-02 SEE INDIVIDUAL SIGN OFF BELOW;[07] PERFORMED REPAIR STRINGER 25L LOC STRINGER 25L BTW BS500D TO BS540 IAW B737-700 SRM 53-00-03-2R-1 REPAIR 1 PARAGRAPH 4.K AND SRM 51-40-02 SEE INDIVIDUAL SIGN OFF BELOW RII

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