- Difficulty date
- October 30, 2001
- Submitted
- November 21, 2001
- Operation
- Air carrier
- Aircraft
- N521UP
- Make and model
- Boeing 747200
- Aircraft serial
- 21944
- Aircraft time
- 66,302 hours, 16,182 cycles
- Part
- Frame
- Condition
- Cracked
- Location
- #4 Pylon
- Stage of operation
- IN
- 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 #4 PYLON NAC STA 235.94 APPROX PYLON VALVE ACCESS PNL #483EL CUTOUT FWD FRAME CRACKED AS MARKED. CUTOUT FWD FRAME CRACK STOP DRILLED & NDT INSPECTION CONFIRMED CRACK FREE BEYOND DRILLED HOLE AS PER NTM PT6, 51-00-00 FIG 4 AND FRAME REPAIRED AS PER SRM 54-14-03 FIG 1 PYLON VALVE WAS REFITTED, AIR LEAK CHK AND OPN CHK CARRIED OUT MM 36-11-01, 36-11-00.