SDR UPS00433943

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
System (JASC): 5320 · Fuselage Miscellaneous Structure
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 1540 TO BS 1560 LT. FORGING REMOVED IAW SRM 51-30-02 AND CORROSION REMOVED IAW SRM 51-10-01. DEPTH OF CORROSION REMOVED IS .009 IAW SRM 56-20-01. FORGING REFITTED IAW SRM 51-30-02 AND QUERY NOTE 36/2000 WHICH IS TO OVERSIZE HOLES BY 1/64 AND PERFORM OPEN HOLE HFEC, ENSURE MIN EDGE MARG IN OF 1.5D ON ALL HOLES EXCEPT HOLES A, B AND C AS SPECIFIED.