Small aircraft pilot reported that an engine failure on final approach resulted in landing on a high...

Attributes
ACN	1742504
Time
Date	202005
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	Small Aircraft
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Route In Use	Direct
Flight Plan	None
Person 1
Function	Instructor Pilot Flying
Qualification	Flight Crew Flight Instructor Flight Crew Instrument Flight Crew Multiengine Flight Crew Rotorcraft
Experience	Flight Crew Last 90 Days 150 Flight Crew Total 25000 Flight Crew Type 400
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy

Narrative:

I was instructing in aircraft X. I was in the traffic pattern for runway xx at ZZZ. My student turned final and was about to put in his final flaps. I was looking outside and talking to the student about the runway alignment and sight picture. I heard the RPM decrease and told the student to hold 1700 RPM at which time he said that he had the throttle full in. I looked down and saw that he did have the throttle full in but the engine was idling around 200 to 400 RPM. I took control of the airplane; retracted the flaps. Established best glide and made a mayday call. I could not make the runway and elected to land on the highway. Landed without incident. Maintenance came and towed it back to the airport with police escort. Cause is under investigation.

Original NASA ASRS Text

Title: Small aircraft pilot reported that an engine failure on final approach resulted in landing on a highway.

Narrative: I was instructing in Aircraft X. I was in the traffic pattern for Runway XX at ZZZ. My student turned final and was about to put in his final flaps. I was looking outside and talking to the student about the runway alignment and sight picture. I heard the RPM decrease and told the student to hold 1700 RPM at which time he said that he had the throttle full in. I looked down and saw that he did have the throttle full in but the engine was idling around 200 to 400 RPM. I took control of the airplane; retracted the flaps. established best glide and made a Mayday call. I could not make the runway and elected to land on the highway. Landed without incident. Maintenance came and towed it back to the airport with police escort. Cause is under investigation.

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.