Service difficulty report · Stringer · Boeing 7377H4

Difficulty date
March 22, 2023
Submitted
April 25, 2023
Operation
Air carrier
Aircraft
N957WN
Make and model
Boeing 7377H4
Aircraft serial
41528
Aircraft time
38,518 hours, 23,626 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 ON AFT OF FWD CARGO BAY END OF STRINGER AT BS 540 STRINGER 23R.<[01] EVALUATED DAMAGE ON STRINGER 23R AT BS 540 FWD CARGO BAY FOUND TO BE OUT OF LIMITS REMOVED CORROSION ON STRINGER 25R AT BS 540 FWD CARGO BAY; AREA L=1' X W=1' IAW SRM 51-10-02-0G-0;[06] REMOVED CORROSION ON STRINGER 23R AT BS 540 FWD CARGO BAY; AREA L=1' X W=1' IAW SRM 51-10-02-0G-0;[07] VERIFIED CORRECTIVE ACTIONS #1; #6<BR>MEASUREMENT TABLE VERIFIED;[08] PERFORMED CUT OUT S-23R FWD CARGO BAY AT BS 500D+12 TO BS 540; IAW SRM 53-00-03-2R-1 REPAIR 1;[09] VERIFIED CORRECTIVE ACTION 8;[10] REQ NDI CUT OUT FOR FREE CRACK CONDITION; AND ALL DAMAGE IS REMOVED IAW SRM 53-00-03-2R-1 REPAIR 1;[11] ACCOMPLISHED HFEC SURFACE SCAN OF CUT EDGE IAW 737 NDTM PART 6 CHAPTER 51-00-00 PROCEDURE 23. NO CRACKS NOTED.<BR><BR>ACCOMPLISHED HFEC OPEN HOLE INSPECTION IAW 737 NDTM PART 6 CHAPTER 51-00-00 PROCEDURE 16. NO CRACKS NOTED. RECEIVED STRINGER SECTION FROM MATERIAL 7075T6 #.036'' CLAD <BR> HFAB53-STR-011 PO NBR 913298 AND HAT CHANNEL FROM MATERIAL 7075T6 #.040'' CLAD HFAB53-HC-011 PO NBR 913289<BR><BR><BR>LOCATED AND DRILLED REPAIR PARTS PER REF SRM 53-00-53 REPAIR 1 APPLIED CHEMICAL CONVERSION AND PRIME ON REPAIR PARTS PER REF SRM 53-00-53 REPAIR 1<INSTALLED REPAIR PARTS PER REF SRM 53-00-53 REPAIR 1 AND 23-153-01037-WIP1;THE DAMAGE WAS REPAIRED PER 737-700 SRM 53-00-03-2R-1 (REPAIR 1) AND EA 23-153-01037.

More about the Boeing 737-7H4