A C-208 engine torque suddenly decreased 300 - 400 pounds; then gradually decreased further as inlet...

Attributes
ACN	1321909
Time
Date	201601
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	Caravan Undifferentiated
Operating Under FAR Part	Part 135
Flight Phase	Cruise
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	Turbine Engine
Person 1
Function	Pilot Flying Captain
Experience	Flight Crew Last 90 Days 300 Flight Crew Total 2000 Flight Crew Type 1000
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

We were enroute today. Flight was pretty normal until about 100 miles outside our destination. Suddenly; we had a 300-400 ft-lbs loss in torque. We couldn't get it back; even with full power. After taking with ATC this we noticed we were losing power at a rate of about 100 ft pounds a minute. Torque and inlet turbine temperature (itt) were gradually rolling back. We diverted immediately. At landing; we had only about 1000 pounds of torque at full power. One pilot flew it; the other worked the problem and coordinate the emergency. Time from start of power loss to landing was less than 3 minutes. We believe we did all possible to act in the interest of our passenger safety. We successfully landed safely.

Original NASA ASRS Text

Title: A C-208 engine torque suddenly decreased 300 - 400 pounds; then gradually decreased further as Inlet Turbine Temperature (ITT) increased. The flight diverted to a nearby airport and landed with 1;000 pound of torque at full power.

Narrative: We were enroute today. Flight was pretty normal until about 100 miles outside our destination. Suddenly; we had a 300-400 ft-lbs loss in torque. We couldn't get it back; even with full power. After taking with ATC this we noticed we were losing power at a rate of about 100 ft pounds a minute. Torque and Inlet Turbine Temperature (ITT) were gradually rolling back. We diverted immediately. At landing; we had only about 1000 pounds of torque at full power. One pilot flew it; the other worked the problem and coordinate the emergency. Time from start of power loss to landing was less than 3 minutes. We believe we did all possible to act in the interest of our passenger safety. We successfully landed safely.

Data retrieved from NASA's ASRS site 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.

A C-208 engine torque suddenly decreased 300 - 400 pounds; then gradually decreased further as inlet turbine temperature (itt) increased. The flight diverted to a nearby airport and landed with 1;000 pound of torque at full power.