SDR UPS00433947

Service difficulty report · Forging · Boeing 747121

Difficulty date: July 14, 2000
Submitted: October 13, 2000
Operation: Air carrier
Aircraft: N691UP
Make and model: Boeing 747121
Aircraft serial: 19641
Aircraft time: 95,273 hours, 22,812 cycles
System (JASC): 5310 · Fuselage Main, Structure
Part: Forging
Condition: Corroded
Location: Fuelage
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 1350 TO BS 1372 RT. FORGING REMOVED IAW SRM 51-30-02 AND CORROSION REMOVED IAW SRM 51-10-01. CORROSION REMOVED = .06. FORGING RE-INSTALLED IAW SRM 51-30-02 AND QUERY NOTE 40/2000 WHICH IS TO INSTALL TWO DOUBLERS TO ENCIRCLE THE COMPLETE WINDOW CUTOUT. OVERSIZE HOLES TO .0156 AND PERFORM OPEN HOLE HFEC FOR CRACKS. MAINTAIN EDGE MARGIN OF 1.5D.