Service difficulty report · Web · Boeing 7377H4

Difficulty date
June 9, 2021
Submitted
July 19, 2021
Operation
Air carrier
Aircraft
N489WN
Make and model
Boeing 7377H4
Aircraft serial
33855
Aircraft time
54,253 hours, 32,244 cycles
Part
Web
Condition
Corroded
Location
Bs 807-836
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 SUBTHRESHOLD WEB AT AFT CARGO BAY BS807 - BS836 RBL26 WL160. ; / [01] EVALUATED CORROSION ON WEB FOUND DEEPEST MEASUREMENT AT BS 827 REMOVED 0.020 FROM ORIG 0.045 FOUND TO BE OUT OF LIMITS PER SRM 53-60-15-1A-1 USING DIAL DEPTH GAUGE P/N ATS 400 P/N UNKNOWN; [02] VERIFIED CORROSION ON WEB FOUND DEEPEST MEASUREMENT AT BS 827 REMOVED 0.020 FROM ORIG 0.045 FOUND TO BE OUT OF LIMITS PER SRM 53-60-15-1A-1 USING DIAL DEPTH GAUGE P/N ATS 400 P/N UNKNOWN; [03] REMOVED SUBTHRESHOLD WEB BS 794-BS847 RBL26 WL 160 PER SRM 51-40-02-0G-0.; [04] LOCATED; DRILLED; DEBURRED NEW SUBTHRESHOLD WEB; INSTALLED NUTPLATES PER SRM 51-40-05-0G-0; SRM 51-40-02-0G-0; DWG 146A8120; DWG146A8340.; [05] LOCATED; DRILLED; DEBURRED NEW SUBTHRESHOLD WEB; INSTALLED NUTPLATES PER SRM 51-40-05-0G-0; SRM 51-40-02-0G-0; DWG 146A8120; DWG146A8340; VERIFIED.; [06] OK TO INSTALL AFT CARGO BAY SUBTHRESHOLD WEB.; [07] VERIFIED OK TO INSTALL AFT CARGO BAY SUBTHRESHOLD WEB.; [08] INSTALLED AFT CARGO BAY SUBTHRESHOLD WEB PER SRM 51-40-02-0G-0; DWG 146A8340.; [09] VERIFIED INSTALLED AFT CARGO BAY SUBTHRESHOLD WEB PER SRM 51-40-02-0G-0; DWG 146A8340.; [10] COMPLETED

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