Service difficulty report · Stringer · Boeing 7377H4

Difficulty date
July 17, 2023
Submitted
August 7, 2023
Operation
Air carrier
Aircraft
N411WN
Make and model
Boeing 7377H4
Aircraft serial
29821
Aircraft time
72,372 hours, 43,147 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

FWD CARGO BAY - CRACK ON STRINGER 23L BS 540 (MARKED)<[01] EVALUATED CRACK AT FCB STRINGER 23L/H BS 539 DAMAGE FOUND TO BE OUT LIMITS IAW SRM 53-00-03-1A FIG 103 DETAIL A;[02] VERIFIED APPLICABILITY FOR STR 23L/H IAW SRM 53-00-03-2R-1 PAR 4; FIG 205.;[03] CUTOUT AND REMOVED DAMAGE STRINGER SECTION BETWEEN BS 500D+12' TO BS 539 IAW SRM 53-00-03-2R-1 PAR 4; STEPS A-B.;[04] UPDATE STEP 1.;[05] VERIFIED CORRECTIVE ACTION #'S 1 AND 3;[06] VERIFIED CORRECTIVE ACTION #2;[07] UPDATE STEP 2.;[08] PERFORM HFEC INSPECTION TO DAMAGE CUTOUT ON STRINGER SECTION AND ALL OPEN HOES COMMON TO REPAIR AREA;[09] RECEIVED NEW STRINGER SECTION P/N:HFAB53-SN-011;LOT:1534490-3;PO/N:929434/3 AND HAT SECTION P/N:HFAB53-HS-011;LOT:1534422-1;PO/N:929434/1.;[10] LOCATED AND DRILLED NEW STRINGER SECTION AT FCB STR 23L/H BETWEEN BS 500D+12' TO BS 539 AND HAT SECTION BETWEEN BS 500D+6' T0 BS 500D+18' AND APPLIED CHEMICAL CONVERSION COATING ON REPAIR PARTS IAW SRM 53-00-03-2R-1; PAR 4; FIG 205.APPLIED PRIME ON REPAIR PARTS IAW SOPM 20-41-02 REQUEST OK TO INSTALL REPAIR PARTS.;[15] VERIFIED CORRECTIVE ACTION #14; OK TO INSTALL REPAIR PARTS;[16] INSTALLED REPAIR PARTS AT FCB STR 23L/H STRINGER SECTION BETWEEN BS 500D+12' TO BS 539 AND HAT SECTION BETWEEN BS 500D+6' T0 BS 500D+18' IAW SRM 53-00-03-2R-1; PAR 4; FIG 205;

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