General aviation flight instructor reported a loss of engine power that resulted in a diversion to a...

Attributes
ACN	1515147
Time
Date	201801
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	M-20 B/C Ranger
Operating Under FAR Part	Part 91
Flight Phase	Descent
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	Engine
Person 1
Function	Instructor Pilot Not Flying
Qualification	Flight Crew Commercial Flight Crew Flight Instructor Flight Crew Multiengine Flight Crew Instrument
Experience	Flight Crew Last 90 Days 133 Flight Crew Total 1177 Flight Crew Type 14
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

Fuel tanks were topped off and the appropriate preflight checklist was completed prior to flight; with an expected endurance of approximately 4 and a half hours. At the time of run-up prior to flight; the appropriate checklist was followed and all systems appeared to be nominal. During enroute flight all systems appeared to be operating in a normal condition. We began a descent completing the appropriate checklist. We flew approximately two and a half hours before a sudden loss of engine power was experienced. Subsequently; the appropriate emergency checklist was completed and air traffic control [was advised]. A diversion was made to ZZZ airport; and a forced landing was successfully executed at the airport with no damage or injuries. Student and I exercised CRM throughout the flight.

Original NASA ASRS Text

Title: General aviation flight instructor reported a loss of engine power that resulted in a diversion to a nearby airport.

Narrative: Fuel tanks were topped off and the appropriate preflight checklist was completed prior to flight; with an expected endurance of approximately 4 and a half hours. At the time of run-up prior to flight; the appropriate checklist was followed and all systems appeared to be nominal. During enroute flight all systems appeared to be operating in a normal condition. We began a descent completing the appropriate checklist. We flew approximately two and a half hours before a sudden loss of engine power was experienced. Subsequently; the appropriate emergency checklist was completed and air traffic control [was advised]. A diversion was made to ZZZ airport; and a forced landing was successfully executed at the airport with no damage or injuries. Student and I exercised CRM throughout the flight.

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.