What was found
APU FAULT ILLUM DURING ATTEMPTED START. GROUNDED-YES. CONFIRMED APU NO START AND FUEL FLOW. MX FAULT 49-41181 REPORTED. REPLACED APU IGNITION UNIT, IAW B737-900 AMM 49-41-31. GROUND VERIFICATION OPS CHK GOOD.
- Difficulty date
- September 22, 2020
- Submitted
- September 24, 2020
- Operation
- Air carrier
- Aircraft
- N431AS
- Make and model
- Boeing 737990ER
- Aircraft serial
- 43255
- Aircraft time
- 26,560 hours, 8,573 cycles
- System (JASC)
- 4940 · APU Start/Ignition System
- Part
- Ignition Sys
- Part number
- 38880587
- Part serial
- 131043
- Condition
- Open
- Location
- Apu
- Part time
- 7,831 hours, 14,714 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.