# SDR ASAA2018102626603

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 23, 2018
- Submitted: October 26, 2018
- Operation: Air carrier
- Aircraft: [N587AS](https://openairdocs.org/aircraft/N587AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35684
- Aircraft time: 42,208 hours, 12,318 cycles
- System (JASC): [7720 · Engine Temperature Indicating System](https://openairdocs.org/jasc/7720)
- Part: Unknown
- Condition: Malfunctioned
- 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/ASAA2018102626603

## Discrepancy

REF LOG 11903751, EGT CONNECTOR CLEANING WAS ACCOMPLISHED PER FIM TASK 77-21-00-839-007. POST CLEANING RECHECK PER T/C 78273000, FOUND FAULT 77-20861 ON LEGS 1, 2, AND 3 (ENGINE 1). GROUNDED - YES. PERFORMED EGT SYSTEM RESISTANCE CHECK (ENG NR 1) REF AMM 77-21-01-200-801-F00. HIGH RESISTANCE FROM CJ10 + T49.5 PROBE (29K OHMS). COULD NOT ISOLATE FAULTY COMPONENT. RESISTANCE WENT TO NORMAL AFTER DISCONNECTING CJ10 FROM T49.5 PROBE AND RECONNECTING. AS A PRECAUTION, REMOVED/REPLACED CJ10 AND S3 PROBE REF AMM 73-21-06, 73-21-01. ALL RELATED TESTS CHECK NORMAL.

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