Service difficulty report · Stringer · Boeing 7377H4

Difficulty date
July 3, 2023
Submitted
August 9, 2023
Operation
Air carrier
Aircraft
N965WN
Make and model
Boeing 7377H4
Aircraft serial
36677
Aircraft time
38,362 hours, 23,630 cycles
Part
Stringer
Part number
UNKNOWN
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

AREA AFT OF FWD CARGO BAY HAS A CORRODED STR. R25 BS500-540; WL 156<[01] EVALUATED CORROSION AT FCB STRINGER 25R/H BS 539 DAMAGE FOUND TO BE OUT LIMITS IAW SRM 53-00-03-1A FIG 103 DETAIL B;[02] VERIFIED APPLICABILITY FOR STR 25R/H AT FCB IAW SRM 53-00-03-2R-1 PAR 4. FIG 206;[03] CUTOUT AND REMOVED DAMAGE AT STRINGER SECTION 25R/H BETWEEN BS 500D+11' TO BS 539 IAW SRM 53-00-03-2R-1 PAR 4 STEPS A-B;[04] VERIFIED APPLICABILITY FOR STR 25R/H AT FCB IAW SRM 53-00-03-2R-1 PAR 4. FIG 206;[05] UPDATE STEPS 1 AND 2;[06] VERIFIED CORRECTIVE ACTION #1; 2; 3; 4;[07] PERFORM HFEC INSPECTION TO DAMAGE TO CUTOUT AT STRINGER 25R/H BS 500D+11';[08] ACCOMPLISHED HFEC SURFACE SCAN OF CUT EDGE IAW 737 NDTM PART 6 CHAPTER 51-00-00 PROCEDURE 23. NO CRACKS NOTED.<BR><BR>EQUIPMENT USED: NORTEC 600 ID: ATS1465 CAL DUE: 09/2023;[09] WHILE PERFORMING STRINGER REPAIR. ADDITIONAL DAMAGED NOTED ON EXISTING STRINGER. REMOVED 3 FASTENERS COMMON TO STRINGER AND SKIN FOM.<BR><BR>CUTOUT ADDITIONAL DAMAGED ON STRINGER SECTION 25R/H STA 500D+7 IAW SRM 53-00-03-2R-1 PAR 4 STEPS A-B;[10] VERIFIED CORRECTIVE ACTION 9;[11] UPDATED MEASUREMENT TABLE;[12] RECEIVED NEW STRINGER SECTION (1EA)P/N:HFAB53-ST-010; LOT:1534363-2; PO/N:929199/2; NEW ANGLE (1EA)P/N: HFAB53-AN-010; LOT:1534359-4;PO/N:929199/4; NEW CHANNEL (2EA) P/N:HFAB53-CN-010; LOT:1534356-6;PO/N:929199/6.;[13] UPDATE STEP 5.;[14] UPDATE STEPS 1;2;5.;[15] REPAIRED STR 25R IAW EA 23-153-02120;[16] VERIFIED CORRECTIVE ACTION 15.

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