Service difficulty report · Web · Boeing 7377H4

Difficulty date
July 16, 2021
Submitted
August 18, 2021
Operation
Air carrier
Aircraft
N444WN
Make and model
Boeing 7377H4
Aircraft serial
29839
Aircraft time
61,121 hours, 35,983 cycles
Part
Web
Condition
Corroded
Location
Threshold
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 ACB DOOR CUTOUT SUB-THRESHOLD WEB AT BS 818; RBL 28; WL 156 ; / [01] CORROSION ON WEB WAS FOUND TO BE OUT OF LIMITS DUE TO PROXIMITY TO FASTENER HOLES PER SRM 53-60-15-1A-1 FIG 103 DETAIL D.; [02] VERIFIED CORRECTIVE ACTION #1<BR> WEB FOUND TO BE OUT OF LIMITS DUE TO PROXIMITY TO FASTENER HOLES; [03] REMOVED ACB SUB-THRESHOLD WEB AT BS818; RBL 28; WL 156 PER SRM 51-40-02-0G-0; [04] LOCATED AND DRILLED ACB SUB-THRESHOLD WEB AT BS818; RBL 28; WL 156 PER SRM 51-40-05-0G-0 PER 146A8340; [05] REMOVED ACB SUB-THRESHOLD WEB AT BS794 - BS847; RBL 28; WL 156 PER SRM 51-40-02-0G-0; [06] LOCATED AND DRILLED ACB SUB-THRESHOLD WEB AT BS794 - BS 847; RBL 28; WL 156 PER SRM 51-40-05-0G-0 PER 146A8340; [07] VERIFIED LOCATED AND DRILLED ACB SUB-THRESHOLD WEB AT BS794 - BS 847; RBL 28; WL 156 PER SRM 51-40-05-0G-0 PER 146A8340; [08] OK TO INSTALL NEW ACB SUB THRESHOLD; [09] OK TO INSTALL AFT CARGO BAY SUB THRESHOLD; [10] APPLIED BMS 5-95 SEALANT AT 8AM 8/3/2021. INSTALLED ALL TEMPORARY/PERMANENT FASTENERS IN ACB SUB THRESHOLD IAW SRM 51-31-00-390-801; [11] INSTALLED ACB SUB THRESHOLD AT BS 794 - BS 847; RBL 28; WL 156 IAW SRM 51-40-03-OG-0; DWG 146A8340; [12] VERIFIED INSTALLATION OF ACB SUB THRESHOLD AT BS 794 - BS 847; RBL 28; WL 156 IAW SRM 51-40-03-OG-0; DWG 146A8340; [13] VERIFIED INSTALLATION OF ACB SUB THRESHOLD AT BS 794 - BS 847; RBL 28; WL 156 IAW SRM 51-40-03-OG-0; DWG 146A8340

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