# SDR JJBA20121031009

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 1, 2012
- Submitted: November 6, 2012
- Operation: Air carrier
- Aircraft: [N365PH](https://openairdocs.org/aircraft/N365PH), registered now
- Make and model: Dhav DHC8202
- Aircraft serial: 526
- Aircraft time: 29,764 hours, 41,458 cycles
- System (JASC): [6120 · Propeller Controlling System](https://openairdocs.org/jasc/6120)
- Part: Control Unit
- Part number: 78249050
- Part serial: 970814
- Condition: Malfunctioned
- Location: Propeller
- Part time: 27,309 hours, 39,347 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/JJBA20121031009

## Discrepancy

CREW REPORTED THAT THE NR 2 ENGINE WAS SURGING 15 - 20 PERCENT TORQUE IN FLIGHT WITH THE PROPS AT 1050.   DECLARED AN EMERGENCY AND RETURNED TO THE FIELD.   MX TRACED THE ISSUE A THE PROP CONTROL UNIT.  UPON REPLACEMENT OF THE PCU AN OPERATIONAL CHECK PRODUCED SATISFACTORY RESULTS.

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