What was found
APU FAULT X2 APU NOT STARTING. GROUNDED - YES. BITE CHECK C/W. FOUND FAULT MSG 49-491012 TWICE, AND 49-71147 & 49-71148 EGT 1&2 THERMOCOUPLE LOSS OF EGT SHUTDOWN, OPERATED APU, STARTED AND RAN NORMALY.
- Difficulty date
- September 5, 2021
- Submitted
- September 7, 2021
- Operation
- Air carrier
- Aircraft
- N530AS
- Make and model
- Boeing 737890
- Aircraft serial
- 36578
- Aircraft time
- 40,400 hours, 11,804 cycles
- System (JASC)
- 4970 · APU Indicating System
- Part
- Thermocouple
- Condition
- Faulted
- Location
- Apu Egt
- 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.