What was found
APU FAILED TO START, SHUTDOWN WITH A FAULT LIGHT. ACFT GROUNDED. REPLACED IGNITION UNIT REF AMM 49-41-31. GROUND VERIFICATION CHECKS NORMAL. THIS CLEARS MEL 49-1B.
- Difficulty date
- April 24, 2016
- Submitted
- April 28, 2016
- Operation
- Air carrier
- Aircraft
- N403AS
- Make and model
- Boeing 737990ER
- Aircraft serial
- 41730
- Aircraft time
- 13,909 hours, 4,493 cycles
- System (JASC)
- 4940 · APU Start/Ignition System
- Part
- Exciter
- Part number
- 38880587
- Part serial
- 120973
- Condition
- Failed
- Location
- Apu
- Part time
- 3,399 hours, 6,792 cycles
- Stage of operation
- NR
- How discovered
- 9
- Nature of condition
- O
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.