Service difficulty report · Stringer · Boeing 7377H4

Difficulty date
January 24, 2023
Submitted
March 6, 2023
Operation
Air carrier
Aircraft
N955WN
Make and model
Boeing 7377H4
Aircraft serial
36671
Aircraft time
38,739 hours, 23,607 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

CRACK ON FWD CARGO BAY END OF STRINGER AT BS 540 STRINGER 23L.<FOUND TO BE OUT LIMITS IAW SRM 53-00-03-1A-1 FIG 103 DETAIL A. REMOVED FASTENERS ON REPAIR AREA BTW B/S 500D +10' TO B/S 536 STRINGER 23L IAW SRM 53-00-03-2R-1 REPAIR 1;[06] PERFORMED CUT AND REMOVED THE DAMAGED PART OF THE STRINGER 23L BTW B/S 500D +10' TO B/S 536 SRM 53-00-03-2R-1 REPAIR 1;[07] PARTIAL STEP 1;FORMING AND HEAT TREAT OF STRINGER SECTION ACCOMPLISHED ON CUSTOMER P.O #902842/3.<BR><BR>FORMING AND HEAT TREAT OF REPAIR HAT SECTION ACCOMPLISHED ON CUSTOMER P.O #902842/1.1.;[11] LOCATED; DRILLED; APPLIED CHEMICAL CONVERSION COAT AND PRIMER TO REWORKED AREA AND [-7] REPAIR REPLACEMENT STRINGER SECTION; [-1] HAT SECTION REPAIR SPLICE PER SRM 53-00-03-2R-1 REPAIR 1 STEP 4 D- J; FIG 205 SHT 2.<BR><BR>REQUEST OKAY TO INSTALL ALL REPAIR PARTS.] INSTALLED STRINGER REPAIR BETWEEN STA 500D - 540; STR 23L PER SRM 53-00-03-2R-1 REPAIR 1.;[16] INSTALLATION VERIFIED; REJECTED DUE TO ALL SRM STEPS NOT ACCOUNTED FOR BY AMT AND THIS IS A CATEGORY B REPAIR; SELECTED REFERENCE IS WRONG AND DID NOT CAPTURE FOLLOW-ON INSPECTION REQUIREMENTS.;[17] STR 23L IS A CATEGORY A PERMANENT REPAIR; NO FOLLOW ON INSPECTIONS.;[18] ENSURED DRAINAGE HOLES ARE NOT BLOCKED; CORROSION INHIBITOR COMPOUND APPLIED.<BR>PER SRM 53-00-03-2R-1 REPAIR 1.>-VERIFIED ALL STEPS OF REPAIR HAVE BEEN COMPLETED AND DOCUMENTED. <BR>REPAIR HAS BEEN COMPLETED TO ITS ENTIRETY PER SRM 53-00-03-2R-1 REPAIR 1.

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