SDR CA020813004

Service difficulty report · Control Unit · Dhav DHC8201

Difficulty date: July 8, 2002
Submitted: August 16, 2002
Operation: Air carrier
Make and model: Dhav DHC8201
Engine: Pwa PW123
Propeller: Hamstd 14SF23
System (JASC): 6120 · Propeller Controlling System
Part: Control Unit
Condition: Binding
Location: Propeller
Stage of operation: IN
How discovered: O
Nature of condition: E
Precautionary procedure: E

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

(CAN) WHILE CARRYING OUT POST-ENGINE CHANGE GROUND RUNS. THE NR 1 ENGINE SUFFERED AN OVER TORQUE OF 149 PERCENT WHEN MOVING THE POWER LEVER FROM DISCING TO FLIGHT IDLE. THE CAUSE OF THE OVER TORQUE WAS DETERMINED TO BE FROM A BINDING PCU. THE PCU WAS REPLACED, THE PROPELLER ASSY WAS REPLACED DUE TO THE OVER TORQUE, AND THE ENGINE WAS INSPECTED IAW DASH 8 AMM ATA 71-00-00, AND PW-123 ENGINE MM ATA 5-10-00. THE AIRCRAFT WAS RETURNED TO SERVICE.