# SDR ASAA2015072112508

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 21, 2015
- Submitted: July 21, 2015
- Operation: Air carrier
- Aircraft: [N586AS](https://openairdocs.org/aircraft/N586AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35189
- Aircraft time: 30,001 hours, 9,253 cycles
- Engine: Cfmint CFM567B27B3
- System (JASC): [7720 · Engine Temperature Indicating System](https://openairdocs.org/jasc/7720)
- Part: Probe
- Part number: TC29604
- Condition: Out Of Limits
- Location: Nr 1 Engine
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2015072112508

## Discrepancy

NR 1 ENGINE TREND DATA SHOWS INCREASE IN EGT AND A DECREASE IN EGT HOT DAY MARGIN.  ACFT GROUNDED.  ACCOMPLISHED NR 1 ENGINE EGT SYSTEM INSPECTION, REF 77-21-01.  FOUND S1 AND S4 OUT OF LIMITS IAW TABLE C.  REPLACED EGT PROBES S1 AND S4 IAW 77-21-01.  PERFORMED OPS TEST, REF 71-00-00.  SYS CHECKS NORMAL.

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