# SDR ASAA2018031423871

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 14, 2018
- Submitted: March 14, 2018
- Operation: Air carrier
- Aircraft: [N479AS](https://openairdocs.org/aircraft/N479AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 60576
- Aircraft time: 10,795 hours, 3,596 cycles
- System (JASC): [4970 · APU Indicating System](https://openairdocs.org/jasc/4970)
- Part: Thermocouple
- Part number: 38762711
- Condition: Defective
- Location: Apu
- Stage of operation: IN
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2018031423871

## Discrepancy

APU EGT TRENDING HIGHER THAN NORMAL. GROUNDED - YES. ENGINEERING REQUEST - REMOVED AND REPLACED APU EGT THERMOCOUPLES 1 & 2 PER AMM 49-71-21. COMPLETED INSTALLATION TEST FOR EGT THERMOCOUPLES 1 AND 2. TEST GOOD PER AMM 49-71-21.THIS COMPLETES STEPS FOR TSR.

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