C172 flight crew reported a throttle malfunction during a test flight; resulting in an in flight shu...

Attributes
ACN	1685253
Time
Date	201909
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	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Route In Use	None
Flight Plan	None
Component
Aircraft Component	Throttle/Power Lever
Person 1
Function	Pilot Flying
Qualification	Flight Crew Instrument Flight Crew Flight Instructor Flight Crew Commercial Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 95 Flight Crew Total 771 Flight Crew Type 635
Person 2
Function	Pilot Not Flying
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Flight Instructor Flight Crew Commercial
Experience	Flight Crew Last 90 Days 60 Flight Crew Total 870 Flight Crew Type 400
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

A cessna 172; first flight with a new engine break-in. All run up indications were normal; and the engine was operating fine. On departure; we proceeded to the VOR to do some holding. After a couple of laps in the hold; the engine started to lose power. Adjusting throttle then appeared to have no effect on RPM. We moved the throttle to full open and full close with no change in the RPM. We [advised ATC]; squawked 7700 and started down to a left base for runway 28. When we started down; we realized the power was stuck at about 2100-2200 RPM. We widened out slightly to allow us to lose altitude and set up for final for runway 28. Once we were close enough; and we both felt we had landing assured; we shut down the engine. We glided down the rest of the way and landed safely on runway 28.

Original NASA ASRS Text

Title: C172 flight crew reported a throttle malfunction during a test flight; resulting in an in flight shutdown and return to the departure airport.

Narrative: A Cessna 172; first flight with a new engine break-in. All run up indications were normal; and the engine was operating fine. On departure; we proceeded to the VOR to do some holding. After a couple of laps in the hold; the engine started to lose power. Adjusting throttle then appeared to have no effect on RPM. We moved the throttle to full open and full close with no change in the RPM. We [advised ATC]; squawked 7700 and started down to a left base for Runway 28. When we started down; we realized the power was stuck at about 2100-2200 RPM. We widened out slightly to allow us to lose altitude and set up for final for Runway 28. Once we were close enough; and we both felt we had landing assured; we shut down the engine. We glided down the rest of the way and landed safely on Runway 28.

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.