What was found
FAN AIR VALVE FAILED TO OPEN WHEN BLEED AIR APPLIED. BLEED AIR TEMP SENSOR SNAP SHOT SHOWS ERRATIC READ INDICATION NR 4 ENG. REPLACED TEMP SENSOR PER AMM 36-22-02-401. OPS CHECKED NORMAL.
- Difficulty date
- May 7, 2013
- Submitted
- June 27, 2013
- Operation
- Air carrier
- Aircraft
- N122UA
- Make and model
- Boeing 747422
- Aircraft serial
- 29168
- Aircraft time
- 57,640 hours, 6,726 cycles
- Engine
- Pwa PW4056
- System (JASC)
- 3610 · Pneumatic Distribution System
- Part
- Sensor
- Part number
- 1122754
- Condition
- Faulty
- Location
- Temp
- 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.