Flight instructor flying a C-172 aircraft encountered engine power reduction after go-around.

Attributes
ACN	1743890
Time
Date	202005
Local Time Of Day	1801-2400
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	Initial Climb
Route In Use	Direct
Flight Plan	VFR
Person 1
Function	Instructor Pilot Flying
Qualification	Flight Crew Commercial Flight Crew Flight Instructor Flight Crew Instrument
Experience	Air Traffic Control Non Radar 3 Air Traffic Control Radar 4 Flight Crew Last 90 Days 100 Flight Crew Total 630 Flight Crew Type 570
Person 2
Function	Pilot Not Flying Trainee
Qualification	Flight Crew Private
Experience	Flight Crew Last 90 Days 1 Flight Crew Total 79 Flight Crew Type 54
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

Simulated engine failure down to ZZZ everything was smooth. Performed a go around; passing 900 feet; sudden reduction in power and strong vibrations. Leveled off at 1100 feet; able to maintain 100 FPM climb with max power achieving 2100 RPM. Called ZZZ1 approach and told them we had a power reduction; they offered a landing at the ZZZ1 but declined. Didn't know how long the engine would remain running. Checked oil temp; normal. Checked oil pressure in the green; fuel was good; mags on both fuel selector on both. Landed at ZZZ with no issues. Engine produced strong vibrations at low rpm. Shut down on airport and pushed back. ZZZ airport NOTAM'd closed.

Original NASA ASRS Text

Title: Flight Instructor flying a C-172 aircraft encountered engine power reduction after go-around.

Narrative: Simulated engine failure down to ZZZ everything was smooth. Performed a go around; passing 900 feet; sudden reduction in power and strong vibrations. Leveled off at 1100 feet; able to maintain 100 FPM climb with max power achieving 2100 RPM. Called ZZZ1 Approach and told them we had a power reduction; they offered a landing at the ZZZ1 but declined. Didn't know how long the engine would remain running. Checked oil temp; normal. Checked oil pressure in the green; fuel was good; mags on both fuel selector on both. Landed at ZZZ with no issues. Engine produced strong vibrations at low rpm. Shut down on airport and pushed back. ZZZ Airport NOTAM'd closed.

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.