A PA46 pilot and instructor experienced a power loss on final approach. While trouble shooting and p...

Attributes
ACN	944708
Time
Date	201104
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	PA-46 Malibu Meridian
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Flight Plan	None
Component
Aircraft Component	Turbine Engine
Person 1
Function	Instructor Pilot Not Flying
Qualification	Flight Crew Flight Instructor Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 50 Flight Crew Total 11000 Flight Crew Type 10
Person 2
Function	Pilot Flying Trainee
Qualification	Flight Crew Multiengine Flight Crew Private Flight Crew Instrument
Experience	Flight Crew Last 90 Days 30 Flight Crew Total 2000 Flight Crew Type 125
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

Normal takeoff with 20 KT headwind and performed two circuits around the traffic pattern to a full stop and taxi back. On the third approach to landing after turning final on approximately 3/4 mile final; the torque indication rolled back and the airplane began to decelerate; the prop felt as it was going towards the flat position. The throttle linkage became totally ineffective in any position. Immediately I instructed the flying pilot to set up and maintain best glide speed; 105 KTS. I retracted the landing gear and approach flaps; checked for ignition and fuel pumps on. Confirmed with the flying pilot the failure and to wait on condition lever/feather. Next step was to activate the emergency throttle over ride. Just before this action was to take place the torque began to increase and the engine came back on line. A normal descent to the runway and routine landing to a full stop followed. The loss of power was approximately for 30-45 seconds. The cause of the power loss is unknown and under investigation. The CRM between the flying pilot and the non flying pilot plus knowledge of the aircraft and systems contributed to the safe outcome in this emergency situation..

Original NASA ASRS Text

Title: A PA46 pilot and instructor experienced a power loss on final approach. While trouble shooting and prior to engine shut down; the engine returned to normal and a normal landing ensued.

Narrative: Normal takeoff with 20 KT headwind and performed two circuits around the traffic pattern to a full stop and taxi back. On the third approach to landing after turning final on approximately 3/4 mile final; the torque indication rolled back and the airplane began to decelerate; the prop felt as it was going towards the flat position. The throttle linkage became totally ineffective in any position. Immediately I instructed the flying pilot to set up and maintain best glide speed; 105 KTS. I retracted the landing gear and approach flaps; checked for ignition and fuel pumps on. Confirmed with the flying pilot the failure and to wait on condition lever/feather. Next step was to activate the emergency throttle over ride. Just before this action was to take place the torque began to increase and the engine came back on line. A normal descent to the runway and routine landing to a full stop followed. The loss of power was approximately for 30-45 seconds. The cause of the power loss is unknown and under investigation. The CRM between the flying pilot and the non flying pilot plus knowledge of the aircraft and systems contributed to the safe outcome in this emergency situation..

Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.