Service difficulty report · Stringer · Boeing 7377H4

Difficulty date
April 3, 2023
Submitted
April 28, 2023
Operation
Air carrier
Aircraft
N412WN
Make and model
Boeing 7377H4
Aircraft serial
29818
Aircraft time
71,376 hours, 42,351 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

CRACKED STRINGER AT AREA AFT OF FCB BS535 S-26R WL153. MARKED<REMOVED DAMAGED SECTION OF S-26R BETWEEN BS 500D TO 540; PERFORMED DVI ON REPAIR AREA AND NO ADDITIONAL DAMAGE FOUND IAW SRM 53-00-03-2R-1 REP.1 PAR. 4 A-B.;[04] REQUIRED NDI HFEC CRACK FREE CUT OUT ON REPAIR AREA IAW SRM 53-00-03-2R-1 REP.1;[05] VERIFIED CORRECTIVE ACTION 3; AND MEASUREMENT TABLE.;[06] HFEC INSPECTED TRIMMED EDGE OF DAMAGE CUTOUT PER 737NDT PART 6 51-00-00 PROCEDURE 23. NO CRACKS FOUND. TOOL N500 IS000680 DUE 04/30/2023.;[07] RECEIVED STRINGER SECTION FROM OSS R.O # 913329-SWA IAW SRM 53-00-03-2R-1 REP.1 PAR.D;[08] VERIFIED CORRECTIVE ACTION STEP 7.;[09] RECEIVED STRINGER SPLICE HAT CHANNEL FROM OSS R.O # 913329-SWA IAW SRM 53-00-03-2R-1 REP.1 PAR.D;[10] VERIFIED CORRECTIVE ACTION #9;[11] LOCATED; DRILLED AND APPLIED CHEMICAL CONVERSION COATING ON REPAIR PARTS AND REPAIR AREA OF S-26R AND BETWEEN BS 500D TO 540 IAW SRM 53-00-03-2R-1 REP.1 PAR.D TO I.;[12] VERIFIED CORRECTIVE ACTION 11. OK TO PRIME GIVEN;[13] APPLIED PRIMER ON REPAIR PARTS AND REPAIR AREA OF S-26R AND BETWEEN BS 500D TO 540 IAW SRM 53-00-03-2R-1 REP.1 PAR J. AND OK TO INSTALL OF REPAIR PARTS AND REMOVED PARTS FOR REPAIR; INSTALLED ALL REPAIR PARTS S-26R AND BETWEEN BS 500D TO 540 IAW SRM 53-00-03-2R-1 REP.1 PAR. K; DWG. 143A3210 AND 143A1215.; ALL WORK IS COMPLETE;[19] APPLIED CIC ON REPAIR AREA S-26R AND BETWEEN BS 500D TO 540 IAW SRM 53-00-03-2R-1 REP.1 PAR. L

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