# SDR ASAA2019030128463

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 1, 2019
- Submitted: March 6, 2019
- Operation: Air carrier
- Aircraft: [N428AS](https://openairdocs.org/aircraft/N428AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36353
- Aircraft time: 12,014 hours, 3,933 cycles
- System (JASC): [7722 · Engine EGT/TIT Indicating System](https://openairdocs.org/jasc/7722)
- Part: Probe
- Part number: TC29603
- Condition: Out Of Limits
- Location: Nr 1 Engine
- 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/ASAA2019030128463

## Discrepancy

WHILE ACCOMPLISHING T/C 78273000 FOUND NR 1 ENGINE FAULT MSG # 77-10851. BOTTOM RIGHT EGT SIGNAL (T495S2) IS OUT OF RANGE. GROUNDED - YES. PERFORMED EGT SYS INSP - RESISTANCE CKS PER AMM TASK 77-21-01-200-801-F00 AND FOUND EGT PROBE S1 OUT OF LIMITS. ACCOMPLISHED EGT CLEANING PER AMM 77-21-00-140-801. REMOVED AND REPLACED EGT PROBE S2 PRECAUTIONARY PER AMM 77-21-01/401. TEMPERATURES ARE WITHIN LIMITS. EEC GROUND VERIFICATION TEST PASSED. THIS CLEARS PLT.

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