SDR CA011205006

Service difficulty report · Control Unit · Dhav DHC8311

Difficulty date: November 15, 2001
Submitted: February 5, 2002
Operation: General aviation
Make and model: Dhav DHC8311
Aircraft time: 23,815 hours
Engine: Pwa PW123
Propeller: Hamstd 14SF15
System (JASC): 6123 · Propeller Feathering/Reversing
Part: Control Unit
Condition: Malfunctioned
Location: Nr 2 Engine
Stage of operation: CL
How discovered: O
Nature of condition: E, J
Precautionary procedure: H, A

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

What was found

(CAN) PRIOR TO TAKE-OFF, AUTOFEATHER ARMING BAULKED, ACTIVATED ON RE-SELECTION. ON TAKE-OFF, AFTER GEAR UP SELECTION, NR 2 ENGINE INITIATED UNCOMMANDED AUTOFEATHER (TORQUE 125 PERCENT PLUS). CREW DE-SELECTED AUTOFEATHER WITHIN FOUR SECONDS, TORQUE RETURNED TO NORMAL. AIRCRAFT RETURNED TO BASE, AND ENGINE / PROP CHANGE CARRIED OUT. ENGINE TORQUE PROBE, HARNESS AND TSCU SHIPPED TO OEM FOR ANALYSIS,