What was found
APU FAILED TO START, MAINT MESSAGE 49055 DISPLAYED FMU STEPPER MOTOR FAILURE, MEL COMPLIED WITH. SEE TASK FIM 49-11 TASK 856. ACP APU GROUND TEST DEFAULTED TO FMU FAILURE ITEM M3374 PART NBR 3036324.
- Difficulty date
- October 27, 2013
- Submitted
- November 1, 2013
- Operation
- Air carrier
- Aircraft
- N181UA
- Make and model
- Boeing 747422
- Aircraft serial
- 25278
- Aircraft time
- 92,321 hours, 11,108 cycles
- Engine
- Pwa PW4056
- System (JASC)
- 4930 · APU Engine Fuel and Control
- Part
- Unknown
- Condition
- Malfunctioned
- Location
- Apu
- Stage of operation
- IN
- How discovered
- O
- Nature of condition
- J
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.