# SDR ASAA2013082295852

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 22, 2013
- Submitted: August 22, 2013
- Operation: Air carrier
- Aircraft: [N403AS](https://openairdocs.org/aircraft/N403AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41730
- Aircraft time: 3,209 hours, 1,021 cycles
- System (JASC): [7720 · Engine Temperature Indicating System](https://openairdocs.org/jasc/7720)
- Part: Probe
- Part number: TC29604
- Condition: Reads High
- Location: Nr 1 Engine
- Stage of operation: IN
- How discovered: V
- Nature of condition: N
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2013082295852

## Discrepancy

DIAGNOSTIC REPORTS NR 1 ENGINE TREND DATA SHOWS A SHIFT IN DELTA CRUISE AND TAKEOFF MARGIN INDICATIVE OF EGT INDICATION ERRORS.  ACFT GROUNDED.  PERFORMED RESISTANCE CKS IAW AMM REF TASK 77-21-01-200-801-F00.  FOUND S4 PROBE READING HIGH RESISTANCE. REPLACED T49.5 (S4) PROBE IAW AMM REF 77-21-01-801/77-32-01-000-801. T49.5  (S4) PROBE PASSED INSTALLATION TEST REF AMM TASK 71-00-00-800-811-FOO.

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