Service difficulty report · Web · Boeing 747422

Difficulty date
November 9, 2008
Submitted
November 18, 2008
Operation
Air carrier
Aircraft
N174UA
Make and model
Boeing 747422
Aircraft serial
24381
Aircraft time
73,069 hours, 8,191 cycles
Engine
Pwa PW4056
Part
Web
Condition
Corroded
Location
Fuselage
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 CANTED DECK SKIN BS 1265-1480, LBL 33.99-R BL 11.33. AFTER CORROSION REMOVAL FOUND EXCESSIVE MATERIAL LOSS AT BS 1265-1308 BL 0 TO LBL 33.99, AND BS 1377-1398 LBL 11.33 - LBL 33.99. MAJOR REPAIR ACCOMPLISHED. BS 1265-1308, CUT OUT DAMAGED WEB. SPLICED IN NEW WEB SECTION WITH LONG DOUBLER FROM BS 1265-1313, OUTBOARD OF LBL 11.33 AND TRANSVERSE DOUBLER AT BS 1310 BL 0- OUTBOARD OF LBL 11.33. FOR BS 1377-1398, CUT OUT DAMAGED WEB, SPLICED IN NEW WEB SECTION WITH 1 LONG DOUBLER INBOARD 094372 OF LBL 11.33 BEAM, 1 LONG DOUBLER INBOARD OF THE LBL 33.99 BEAM, 1 TRANSVERSE DOUBLER AT BS 137.5, AND 1 TRAN DOUBLER AT APPROX BS 1410.