Service difficulty report · Web · Boeing 7377CT

Difficulty date
June 3, 2021
Submitted
July 12, 2021
Operation
Air carrier
Aircraft
N7823A
Make and model
Boeing 7377CT
Aircraft serial
32749
Aircraft time
61,112 hours, 30,940 cycles
Part
Web
Condition
Corroded
Location
Bs 454-459
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 IN FWD COMPARTMENT ON SUB THRESHOLD WEB AT BS 459-454 RBL 28-30 WL 156 ; / [01] EVALUATED CORROSION BS 454-459 FOUND 0.020 REMOVED FROM ORIG 0.045 FOUND TO BE OUT OF LIMITS PER SRM 53-30-15-1A-1 USING DEPTH GAUGE P/N ATS400 S/N UNKNOWN; [02] VERIFIED CORROSION BS 454-459 FOUND 0.020 REMOVED FROM ORIG 0.045 FOUND TO BE OUT OF LIMITS PER SRM 53-30-15-1A-1 USING DEPTH GAUGE P/N ATS400 S/N UNKNOWN; [03] REMOVED FCB SUB-THRESHOLD WEB BS440-BS494; RBL 28; WL 156. PER SRM 51-40-02-0G-0; [04] LOCATED AND DRILLED AND COUNTERSINK NEW WEB PER SRM 51-40-02; [05] INSTALLED NUTPLATES PER DWG. 143A8330 AND SRM 51-40-02-0G-0; [06] VERIFIED INSTALLATION OF NUTPLATES ON FCB SUBTHRESHOLD WEB PER DWG 143A8330 AND SRM 51-40-02; [07] OLD THRESHOLD WEB AT BS 440 TO 480+12' RBL 28-30 WL 156 WAS REMOVED ON SWA CARD# 5330-E-16461-NG. OK TO INSTALL NEW THRESLHOLD WEB; [08] ADDED PART USE; [09] OK TO INSTALL NEW THRESLHOLD WEB; [10] VERIFIED LOCATION AND DRILL UP OF NEW SUB-THRESHOLD. OK TO INSTALL.; [11] INSTALLED THRELHOLD WEB AT BS 440 TO 480+12' RBL 28-30 WL 156 PER SRM 51-40-02-0G-0; AND DWG 143A8330; [12] VERIFIED INSTALL; [13] VERIFIED INSTALLATION OF SUBTHRESHOLD PER DWG 143A8330 AND SRM 51-40-02; [14] COMPLETE

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