Service difficulty report · Stringer · Boeing 7377H4

Difficulty date
April 26, 2023
Submitted
June 1, 2023
Operation
Air carrier
Aircraft
N285WN
Make and model
Boeing 7377H4
Aircraft serial
32536
Aircraft time
51,630 hours, 31,054 cycles
Part
Stringer
Condition
Corroded
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

CORROSION ON STRINGER AT AREA AFT OF FWD CARGO BAY BS535 S-25R WL155. MARKED<[01] PARTIALLY UPDATED STEP 1;[02] REMOVED DAMAGED SECTION OF STRINGER 25R BETWEEN BS 500D+11' - 535 IAW SRM 53-00-03-2R-1 REP.1 AND EA 23-153-01379.;[03] VERIFIED CORRECTIVE ACTION 2.;[04] VERIFIED STEP 1 PARTIAL.;[05] RECEIVED NEW STRINGER SECTION S-24L FROM OSS RO. 917149-SWA IAW SRM 53-00-03-2R-1 REP. 1 PAR. 4D.;[06] CORRECTION: RECEIVED NEW STRINGER SECTION S-25R FROM OSS RO. 916965-SWA; 2 ANGLES FROM RO# 916967-SWA; AND 1 CHORD FROM RO# 916963-SWA IAW SRM 53-00-03-2R-1 REP. 1 PAR. 4D. AND EA 23-153-01379.;[07] VERIFIED CORRECTIVE ACTION 6.;[08] LOCATED; DRILLED; APPLIED CHEMICAL CONVERSION COATING AND PRIMER ON REPAIR PARTS AND REPAIR AREA STRINGER 25R BS 500D+12'-540 IAW SRM 53-00-03-2R-1 REP. 1 PAR. 4E-J AND EA 23-153-01379. OK TO INSTALL REPAIR PARTS;[09] VERIFIED CORRECTIVE ACTION 8 OK TO INSTALL;[10] INSTALLED REPAIR PARTS AT BS 500D+12'-540 STR 25R IAW SRM 53-00-03-2R-1 REP. 1 PAR. 4E-J AND EA 23-153-01379.;[11] VERIFIED STEP 2 AND CORRECTIVE ACTION 10.;[12] VERIFIED THE MEASUREMENT TABLE.;[13] ALL STEPS COMPLETED;[14] RII INSPECTION REQUIREMENTS COMPLETE.;[15] VERIFIED STEP 1.;[16] THE DAMAGE WAS REPAIRED PER 737-700 SRM 53-00-03-2R-1 (REPAIR 1) AND EA 23-153-01379;[17] VERIFIED CORRECTIVE ACTION ITEMS AND MEASUREMENT FIELDS; CARD COMPLETE.

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