# SDR ASAA2019011227773

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 12, 2019
- Submitted: January 15, 2019
- Operation: Air carrier
- Aircraft: [N508AS](https://openairdocs.org/aircraft/N508AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35691
- Aircraft time: 39,899 hours, 11,977 cycles
- System (JASC): [7722 · Engine EGT/TIT Indicating System](https://openairdocs.org/jasc/7722)
- Part: Probe
- Part number: TC29603
- Condition: Out Of Tolerance
- Location: Nr 2 Engine
- Stage of operation: IN
- How discovered: O
- Nature of condition: N
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2019011227773

## Discrepancy

DIAGNOSTICS HAS ISSUED AN CNR20190105027 FOR NR 2 ENG INCREASE IN DELTA EGT AND A DECREASE IN EGT HOT DAY MARGIN. INDICATION ERROR IS SUSPECT. GROUNDED - YES. REMOVED AND REPLACED TOP LEFT T49.5 S4 PROBE AS PRECAUTIONARY IAW AMM 77-21-01. GROUND VERIFICATION TEST IS GOOD. POST T49.5 READINGS ARE S1 34.4, S2 17.2, S3 16.9, S4 34.1 CLEARED EEC FAULTS.

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