Service difficulty report · Threshold Web · Boeing 7378H4

Difficulty date
April 15, 2026
Submitted
May 12, 2026
Operation
Air carrier
Aircraft
N8639B
Make and model
Boeing 7378H4
Aircraft serial
60086
Aircraft time
39,504 hours, 19,287 cycles
Part
Threshold Web
Condition
Corroded
Location
Zone 100
Stage of operation
IN
How discovered
V
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 CARGO COMPARTMENT DOOR CUT-OUT SUB-THRESHOLD WEB CORRODED FROM STA 787+9 TO STA 827+15; RBL 21 TO RBL 28; WL 156. REMOVED AND REPLACED SUB-THRESHOLD WEB AT BS 787+7 TO BS 847 RBL 24 WL 156 IAW SRM 51-40-02-0G-0 AND DWG 146A8120 REV A.

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