What was found
APU FAULT LIGHT CAME ON AND WOULD NOT RESET. GROUNDED - YES. REMOVED AND REPLACED APU IGNITION UNIT AND LEAD. OPS CHECK GOOD. REFERENCE APPLICABLE STEPS IN AMM 49-41-31 AND 49-41-52.
- Difficulty date
- October 11, 2018
- Submitted
- October 15, 2018
- Operation
- Air carrier
- Aircraft
- N440AS
- Make and model
- Boeing 737990ER
- Aircraft serial
- 41705
- Aircraft time
- 19,932 hours, 6,619 cycles
- System (JASC)
- 4940 · APU Start/Ignition System
- Part
- Ignition Unit
- Part number
- 38880587
- Part serial
- 130236
- Condition
- Failed
- Location
- Apu
- Part time
- 3,183 hours, 6,028 cycles
- Stage of operation
- NR
- 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.