What was found
APU STATUS MESSAGE CONTINUOUSLY DISPLAYED AFTER GROUND POWER LOSS. REPLACED APU NR 2 SPEED SENSOR PER MM. RAN APU, TRANSFERRED POWER BACK AND FORTH BETWEEN APU AND GROUND POWER. NO MESSAGE PRESENT.
- Difficulty date
- December 31, 2011
- Submitted
- January 26, 2012
- Operation
- Air carrier
- Aircraft
- N780UA
- Make and model
- Boeing 777222
- Aircraft serial
- 26944
- Aircraft time
- 62,900 hours, 11,207 cycles
- Engine
- Pwa PW4077
- System (JASC)
- 4900 · Airborne Auxiliary Power Unit (APU) System
- Part
- Sensor
- Part number
- 38762121
- Condition
- Failed
- Location
- Nr 2 Speed Card
- Stage of operation
- NR
- How discovered
- 9
- Nature of condition
- J
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.