# SDR ASAA2023042543028

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 25, 2023
- Submitted: April 29, 2023
- Operation: Air carrier
- Aircraft: [N532AS](https://openairdocs.org/aircraft/N532AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 36346
- Aircraft time: 46,034 hours, 13,589 cycles
- System (JASC): [4900 · Airborne Auxiliary Power Unit (APU) System](https://openairdocs.org/jasc/4900)
- Part: Sensor
- Part number: 38762252
- Condition: Faulty
- Location: Apu
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023042543028

## Discrepancy

PER MAINT CONTROL SCOTT CSS FAIL START ATTEMPT AT FL 410 W/ FAULT LIGHT ILLUMINATED. GROUNDED - YES. PERFORMED BITE CHECK OF APU REF B737-800 AMM 49-61-00 - FOUND STOPS CHECK NORMAL. PER TECH SERVICE REMOVED AND REPLACED INLET TEMP SENSOR REF B737-800 AMM 49-61-31 & REMOVE AND REPLACE PRESS SENSOR AND SENSE LINE BLOW OUT REF AMM 49-52-31. INSPECTION OF DP & TP SENSORS NO DEFECTS NOTED. OP CHECK OF APU NORMAL - BITE CHECK - NO FAULTS.

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