# SDR ASAA2021090535866

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 5, 2021
- Submitted: September 7, 2021
- Operation: Air carrier
- Aircraft: [N530AS](https://openairdocs.org/aircraft/N530AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 36578
- Aircraft time: 40,400 hours, 11,804 cycles
- System (JASC): [4970 · APU Indicating System](https://openairdocs.org/jasc/4970)
- Part: Thermocouple
- Condition: Faulted
- Location: Apu Egt
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021090535866

## Discrepancy

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.

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