Service difficulty report · Stringer · Boeing 7377H4

Difficulty date
April 26, 2023
Submitted
May 25, 2023
Operation
Air carrier
Aircraft
N959WN
Make and model
Boeing 7377H4
Aircraft serial
36674
Aircraft time
38,285 hours, 23,370 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 AT AREA AFT OF FWD CARGO BAY; STR 23R; BS 535; WL 164<[01] VERIFIED THE APPLICABILITY OF SRM 53-30-03-0I-1 ; SRM 53-00-03-1A-1 ; AND SRM 53-00-03-2R-1 REPAIR 1;[02] CORROSION ON AREA AFT OF FWD CARGO BAY; STR 23R; BS 535; WL 164 FOUND TO BE OUT OF LIMITS DUE TO 100% OF MATERIAL LOSS ; ORIGINAL THICKNESS IS 0.045' IAW SRM 53-30-03-0I-1 AND SRM 53-00-03-1A-1;[03] CUT AND REMOVED THE DAMAGED SECTION OF STRINGER 23R BETWEEN BS 500D+11' AND BS 540 IAW SRM 53-00-03-2R-1 REPAIR 1;[04] REQUEST NDI TO DO HFEC INSPECTION OF THE REPAIR AREA TO MAKE SURE THAT ALL OF THE DAMAGE IS REMOVED. REFER TO 737 NDT PART 6; 51-00-00; FIGURE 4;[05] VERIFIED CORRECTIVE ACTION 1-3.;[06] NDT HFEC INSPECTED SURFACE AND EDGES PER 737 NDTM PART 6; 51-00-00; PROC 23 (FIG 4); NO CRACKS NOTED. SEE WIP1.<BR>EQUIP ID ATS1465 DUE 09/23;[07] REPAIRED FWD CARGO BAY; STR 23R; BS 500D TO BS 540 IAW SRM 53-00-03-2R-1 REPAIR 1 AND EA 23-153-01410-WIP1;[08] VERIFIED CORRECTIVE ACTION #7.;[09] CORRECTED P/N IN MEASUREMENTS SECTION;[10] VERIFIED MEASUREMENTS TABLE.;[11] 'THE DAMAGE WAS REPAIRED PER 737-700 SRM 53-00-03-2R-1 (REPAIR 1) AND EA 23-153-01410';[12] VERIFIED CORRECTIVE ACTION 11.

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