Service difficulty report · Stringer · Boeing 7377H4

Difficulty date
April 3, 2023
Submitted
April 27, 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-25L WL155. MARKED<[01] NO ALLOWABLE DAMAGED FOUND ON SRM FOR CRACK ON FCB BS535 S-25L WL164; VERIFIED APPLICABILITY OF SRM 53-00-03-2R-1 REP.1 FOR STR-25L REPAIR.[07] RECEIVED STRINGER SECTION FROM OSS R.O # 913323-SWA IAW SRM 53-00-03-2R-1 REP.1 PAR.D;[08] VERIFIED CORRCTIVE ACTION STEP 7.;[09] RECEIVED STRINGER SPLICE HAT CHANNEL FROM OSS R.O # 913323-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-25L AND BETWEEN BS 500D TO 540 IAW SRM 53-00-03-2R-1 REP.1 PAR.D TO I.;[12] VERIFIED CORRECTIVE ACTION 11;[13] OK TO PRIME GIVEN;[14] APPLIED PRIMER ON REPAIR PARTS AND REPAIR AREA OF S-25L 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;[15] VERIFIED CORRECTIVE ACTION ITEM 14.<BR>OKAY TO INSTALL REPAIR PARTS AND PARTS REMOVED TO FACILITATE REPAIR GIVEN.;[16] INSTALLED ALL REPAIR PARTS S-25L AND BETWEEN BS 500D TO 540 IAW SRM 53-00-03-2R-1 REP.1 PAR. K; DWG. 143A3210 AND 143A1215.

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