Service difficulty report · Keelbeam · Boeing 747121

Difficulty date
March 26, 2004
Submitted
April 19, 2004
Operation
Air carrier
Aircraft
N683UP
Make and model
Boeing 747121
Aircraft serial
20353
Aircraft time
84,505 hours, 20,783 cycles
Part
Keelbeam
Condition
Corroded
Location
Fuselage
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

INSPECTION TYPE: C, FX - KEELBEAM BOX INTERIOR LOWER WEB FOUND HEAVY CORROSION AT STA 1112 TO STA 1115 RBL 3 TO RBL 6. CORROSION BLEND OUT 0.039 X 2 X 2 INCH. KEEL BEAM BOX LOWER WEB REPAIRED AS PER HX RS R53-49-35142 AND UPS ENGINEERING FILE NR 747-53-20182, NRC 5728 FOR REPAIR DETAILS.