# SDR CA110321005

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 14, 2011
- Submitted: September 14, 2015
- Operation: General aviation
- Make and model: Dhav DHC8102
- Aircraft time: 55,168 hours
- Engine: Pwa PW120A
- Propeller: Hamstd 14SF7
- System (JASC): [7200 · Engine (Turbine/Turboprop)](https://openairdocs.org/jasc/7200)
- Part: Engine
- Part number: 310450001
- Condition: Faulty
- Location: Nr 2
- Part time: 48,973 hours
- Stage of operation: TO
- How discovered: O
- Nature of condition: O
- Precautionary procedure: C
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA110321005

## Discrepancy

(CAN) TAIL 833 CREW REJECTED THE TAKEOFF WHEN THE TORQUE INDICATION ON THE NR 2 ENG WENT TO ZERO BOTH ANALOG & DIGITAL.  AFTER TALKING TO MX, THE CREW TRIED AGAIN & THEY DID ANOTHER REJECTED TAKEOFF.  BOTH REJECTED TAKEOFFS WERE BELOW 80 KTS.  ACFT REMOVED FOR THE LINE & START TROUBLESHOOTING.  NR 2 ENG TORQUE INDICATOR & TORQUE SENSOR REPLACED & NO FIX.  ALSO THE NR 2 ENG HARNESS REPLACED & NO FIX.  ENG NR 1 & NR 2, TORQUE SIGNAL CONDITIONING UNIT & ELECTRONIC ENGINE CONTROL UNIT SWAP & STILL NO FIX.  DURING TROUBLESHOOTING, IT WAS FOUND THAT WE HAVE STEADY SNAG WITH NR 2 ENG IN MAX & REVERSE, THE TORQUE RISE & SUDDENLY DROPS TO ZERO AT APPROX 50% OF TORQUE.  DECISION WAS MADE TO REPLACE THE NR 2 ENG.  INSPECTION WAS MADE ON REMOVED ENG & FOUND DAMAGE ON THE PROP SHAFT INNER PORTION & DAMAGE ALSO FOUND ON TORQUE SHAFT WITH METAL PART MISSING.  THIS ENG WAS INSTALLED ON ACFT, THE 1 FEBRUARY 2010 REFERENCE WO 223552.

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