# SDR 187531

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 1, 2004
- Submitted: February 2, 2004
- Operation: Air carrier
- Aircraft: N158SD
- Make and model: Saab SF340A
- Registry model: [Saab SF340A](https://openairdocs.org/model/saab-scania-sf340a) (OpenAirDocs)
- Aircraft serial: 158SD
- Aircraft time: 29,243 hours, 31,421 cycles
- Engine: Ge CT75A2
- Engine time: 32,900 hours, 33,655 cycles
- System (JASC): [7200 · Engine (Turbine/Turboprop)](https://openairdocs.org/jasc/7200)
- Part: Engine
- Condition: Malfunctioned
- Location: Right
- Stage of operation: CR
- How discovered: O
- Nature of condition: E, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/187531

## Discrepancy

DURING CRUISE THE CREW SET THE RIGHT ENGINE POWER AT 80 PERCENT TQ.  THE CREW HEARD A LOUD BANG, FELT A SLIGHT YAW AND NOTICED THAT THE RIGHT TQ HAD DROPPED TO APPROX 70 PERCENT.  THE CREW ADJUSTED THE TQ AND THEN HEARD MULTIPLE BANGS ALONG WITH A DROP IN RIGHT TQ AND AN ASSOCIATED RIGHT IGNITION WARNING LIGHT.  THE CREW FOLLOWED THE QRH AND RETURNED TO PIT.  A/C TAKEN OUT OF SERVICE AT 1710 (LT) 02-01-04.

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