# SDR MALA976015

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 26, 1998
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N421XJ
- Make and model: Saab 340B
- Registry model: [Saab 340B](https://openairdocs.org/model/saab-340b) (OpenAirDocs)
- Aircraft serial: 421
- System (JASC): [7712 · Engine BMEP/Torque Indicating](https://openairdocs.org/jasc/7712)
- Part: Sensor
- Part number: 5066T52G05
- Condition: Failed
- Location: Lt Engine
- Stage of operation: CL
- Nature of condition: N
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/MALA976015

## Discrepancy

AFTER TAKEOFF, THE LEFT ENGINE TEMP STARTED TO FLUCTUATE, FOLLOWED BY THE ENGINE RPM AND TORQUE; LEFT IGNITION LIGHT ALSO ILLUMINATED.  AIRCRAFT RETURNED TO DTW.  MAINTENANCE REPLACED THE LEFT NP SPEED SENSOR AND NO1 TORQUE SENSOR, ALL CHECKS GOOD.

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