# SDR ASAA2013120396591

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 3, 2013
- Submitted: December 5, 2013
- Operation: Air carrier
- Aircraft: [N579AS](https://openairdocs.org/aircraft/N579AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35187
- Aircraft time: 29,589 hours, 7,733 cycles
- System (JASC): [4960 · APU Controls](https://openairdocs.org/jasc/4960)
- Part: Sensor
- Part number: MS280341
- Condition: Malfunctioned
- Location: Apu
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2013120396591

## Discrepancy

APU CT5ATP TREND DATA SHOWS EGT TO BE NOT STABLE INPUT ERRORS ARE SUSPECT.  ACFT GROUNDED.  REPLACED APU INLET TEMPERATURE SENSOR.  OP CHECK GOOD IAW AMM 49-61-31-400-801.

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