Service difficulty report · Forging · Boeing 747121

Difficulty date
July 14, 2000
Submitted
October 12, 2000
Operation
Air carrier
Aircraft
N691UP
Make and model
Boeing 747121
Aircraft serial
19641
Aircraft time
95,273 hours, 22,812 cycles
Part
Forging
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

INSPECTION TYPE:C, CABIN WINDOW FORGING CORRODED AT BS 1600 TO BS 1620 LT. FORGING REMOVED IAW SRM 51-30-02 AND CORROSION REMOVED IAW SRM 51-10-01. DEPTH OF CORROSION REMOVED IS .010 IAW SRM 56-20-01. REFIT FORGING IAW SRM 51-30-02 AND QUERY NOTE 65/2000 WHICH IS TO OVERSIZE HOLES BY .0156 AND PERFORM OPEN HOLE HFEC FOR CRACKS. MAINTAIN MIN EDGE MARGIN OF 1.5D AND REFIT FORGING.