# SDR ASAA2012120493412

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 4, 2012
- Submitted: December 11, 2012
- Operation: Air carrier
- Aircraft: [N533AS](https://openairdocs.org/aircraft/N533AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35201
- Aircraft time: 7,384 hours, 2,293 cycles
- System (JASC): [4970 · APU Indicating System](https://openairdocs.org/jasc/4970)
- Part: Sensor
- Part number: MS280341
- Condition: Malfunctioned
- Location: Apu Inlet Temp
- 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/ASAA2012120493412

## Discrepancy

APU CTSATP TREND DATA SHOWS MES EGT IS AT OR NEAR THE ESTABLISHED THRESHOLD. INDICATION ERRORS ARE SUSPECT.  R & R APU INLET TEMP (T2) SENSOR IAW AMM 49-61-31.  REMOVED CLEANED AND RE-INSTALLED APU INLET PRESSURE (P2) SENSOR IAW AMM 49-52-31.  PERFORMED APU OPERATION AND BITE TEST IAW AMM 49-61-00-700-801 (BITE TEST) AND 49-11-00-850-801 (STARTING).  NO ISSUES OR FAULTS FOUND. CURRENT STATUS HAS NO ISSUES OR FAULTS.

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