What was found
LOW DUCT PRESS ON LEFT WING DURING START. ISOLATION VALVE DOES NOT CLOSE. REMOVE AND REPLACED ISOLATION VALVE. OPS CHECK GOOD IAW MM 36-11-07.
- Difficulty date
- March 31, 1998
- Submitted
- March 26, 2000
- Operation
- Air carrier
- Aircraft
- N850FT
- Make and model
- Boeing 747122
- Aircraft serial
- 19755
- System (JASC)
- 3610 · Pneumatic Distribution System
- Part
- Isolation Valve
- Part number
- 39831021
- Condition
- Inoperative
- Location
- Left
- Stage of operation
- TX
- Nature of condition
- O
- Precautionary procedure
- D
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.