Service difficulty report · Stringer · Boeing 7377BD

Difficulty date
March 3, 2023
Submitted
April 3, 2023
Operation
Air carrier
Aircraft
N556WN
Make and model
Boeing 7377BD
Aircraft serial
33936
Aircraft time
37,398 hours, 21,958 cycles
Part
Stringer
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 ON FWD CARGO BAY END OF STRINGER AT BS 540 STRINGER 23L.<[01] SRM 53-00-03-2R-1 REPAIR 1 IS APPLICABLE TO THIS REPAIR AT S-23L;[07] RECEIVED 1 EA REPLACMENT STRINGER AND SPLICE FROM MACHINE SHOP AND PENETRANT INSPECTED ON CUSTOMER RO# 909154-SWA-(JOB#557570); FABRICATED LOCATED AND DRILLED BOTH STRINGER AND SPLICE ANGLE IAW SROM 53-00-03-2R-0AND EA#23-153-00792 REV-A OK TO TREAT AND PRIME;[08] VERIFIED CORRECTIVE ACTIONS STEP 7; OK TO TREAT AND PRIME GIVEN.;[09] APPLIED CHEMICAL CONVERSION COATING AND PRIMED ALL REPAIR PARTS AND CUTOUT IAW SRM 51-20-01-0G-0 AND SOPM 20-41-02 OK TO INSTALL ALL REPAIR PARTS.;[10] VERIFIED CORRECTIVE ACTIONS STEP 9; VERIFIED MEASUREMENTS TABLE.;[11] INSTALLED ALL REPAIR PARTS ON FWD CARGO BAY BS 500D+10 TO BS 540 S-23L IAW SRM 53-00-03-2R-1 REPAIR 1;[12] PRIOR TO INSTALLATION ON STEP 7 SPLICE REPAIR PART FABRICATED UPDATE MATERIAL MADE FROM BAC1498-117#7075T62 LOT# 388721-1 IAW SRM 53-00-03-2R-1; REPAIR 1;[13] VERIFIED CORRECTIVE ACTION 11;12 AND STEPS 2 AND 3;[14] APPLIED FILLET SEAL AND CIC AROUND REPAIR AREA FWD CARGO BAY STRINGER 23L BS 500D+10 TO BS 540 IAW SRM 53-00-03-2R-1; REPAIR 1;[15] VERIFIED CORRECTIVE ACTION 14;[16] THE DAMAGE WAS REPAIRED PER 737-700 SRM 53-00-03-2R-1 (REPAIR 1) AND EA 23-153-00792;[17] STEP 1 N/A DUE TO REPAIR BEING CAT A;[18] VERIFIED STEPS 16 AND 17.;[19] VERIFIED MEASUREMENTS FIELDS.

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