# SDR ASAA0956644

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 19, 2009
- Submitted: September 21, 2009
- Operation: Air carrier
- Aircraft: [N563AS](https://openairdocs.org/aircraft/N563AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35180
- Aircraft time: 11,250 hours, 3,558 cycles
- Engine: Cfmint CFM567B27
- System (JASC): [7720 · Engine Temperature Indicating System](https://openairdocs.org/jasc/7720)
- Part: Indication Sys
- 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/ASAA0956644

## Discrepancy

GE DIAGNOSTICS REPORTS NR 1 ENGINE TREND DATA SHOWS A SUDDEN DECREASE IN CRUISE DELTA EGT WITH A CORRESPONDING INCREASE IN TAKEOFF HOT DAY MARGIN.  INDICATION ERRORS ARE SUSPECT.  LONG TERM FAULT 77 10841 TOP RIGHT EGT SIGNAL OUT OF RANGE NR 1 ENG.  ACCOMPLISHED TSR 904861 WO 44572 TC 78273000, ACCOMPLISHED CLEANED EGT CONNECTORS REF MM 77-21-00 NO HELP.  REPLACED S1 EGT PROBE REF MM 77-21-01 NO HELP.  PERFORMED EEC BITE TEST FOR ENG 1 CHA + CHB NO RECENT FAULTS AND NO RECORDED FAULTS LOGGED.

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