Service difficulty report · Stringer · Boeing 7377H4

Difficulty date
May 25, 2023
Submitted
June 29, 2023
Operation
Air carrier
Aircraft
N960WN
Make and model
Boeing 7377H4
Aircraft serial
36675
Aircraft time
38,108 hours, 23,248 cycles
Part
Stringer
Part number
UNKNOWN
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

AFT AREA OF FWD CARGO BAY STR 25 IS CRACKED AT AFT FASTENER ; RBL 29<[01] EVALUATED CRACK MEASUREMENTS ON FCB STRINGER 25R BS 539 DAMAGE FOUND TO BE OUT LIMITS IAW SRM 53-00-03-1A FIG 103 DETAIL A;[02] VERIFIED APPLICABILITY FOR STR 25R IAW SRM 53-00-03-2R-1 FIG 206;[03] LEAD SHOP VERIFICATION SRM APPLICABILITY FOR STEP 2;[04] LEADERSHIP VERIFICATION OF SRM APPLICABILITY FOR STEP 2.;[05] VERIFIED CORRECTIVE ACTIONS 1-4.;[06] UPDATED STEP 1.;[07] PARTIAL ENTRY STEPS 2 AND 4;[08] CUTOUT AND REMOVED DAMAGE ON STR 25R BETWEEN BS 500D+11' TO BS 539 IAW SRM 53-00-03-2R-1 PAR 4. STEP B.;[09] PERFORM HFEC INSPECTION TO DAMAGE CUTOUT.;[10] VERIFIED CORRECTIVE ACTION 8.;[11] STEP 3 N/A ; WRONG REFERENCE.;[12] UPDATE STEPS 5 AND 6.;[13] RECEIVED NEW STRINGER [1EA] P/N:HFAB53-STR-011;LOT:1529446-1;PO/N:921989/1 ; NEW CHANNEL [2EA] P/N:HFAB53-CN-011;LOT:1530142-1;PO/N:923017/1; NEW CHANNEL [1EA] P/N:HFAB53-CN-011;LOT:1530144-1;PO/N:923014/1.;[14] LOCATED AND DRILLED NEW REPAIR PARTS AT FCB BETWEEN BS 500D+5' TO BS 539 STR 25R IAW SRM 53-00-03-2R-1 AND EA NO:23-153-01733 REV:A[22] REPAIRED STR 25R BS 500D+5' TO BS 539 IAW EA NO:23-153-01733;[23] VERIFIED ITEM 22 CORRECTIVE ACTIONS.;[24] VERIFIED MEASUREMENTS.

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