SDR CA980317009

Service difficulty report · Hydro Mech Unit · Dhav DHC8102

Difficulty date: February 12, 1998
Submitted: January 19, 2001
Operation: Air carrier
Make and model: Dhav DHC8102
Aircraft time: 22,462 hours
Engine: Pwa PW120A
Propeller: Hamstd 14SF7
System (JASC): 7322 · Fuel Control/Reciprocating Engines
Part: Hydro Mech Unit
Part number: 7863916
Condition: Faulty
Location: Nr 1 Engine
Part time: 9,552 hours, 13,116 cycles
Stage of operation: CL
How discovered: V
Nature of condition: R, J
Precautionary procedure: A

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

What was found

(CAN) DURING CLIMB AT FL200 NR 1 ENGINE TORQUE STARTED TO DECREASE. WITH NR 1 ENGINE POWER LEVER FULLY FORWARD NR 1 ENGINE TORQUE WAS 20 PERCENT LOWER THAN NR 2 ENGINE. AIRCRAFT DIVERTED. HYDRO MECHANICAL UNIT (HMU) AND FUEL PUMP REPLACED.