C172 instructor pilot reported landing safely after experiencing loss of power and engine vibrations...

Attributes
ACN	1742809
Time
Date	202005
Local Time Of Day	1201-1800
Place
Locale Reference	06C.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	Climb
Route In Use	Direct
Flight Plan	VFR
Component
Aircraft Component	Engine
Person 1
Function	Instructor Pilot Not Flying
Qualification	Flight Crew Commercial Flight Crew Flight Instructor Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 250 Flight Crew Total 1050 Flight Crew Type 500
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

During climb lost 400 rpm with full throttle. Airspeed began to decrease; I took flight controls from student. I returned to level flight; rpm increased slightly; then back down to 2100 with full throttle.engine began to shake intensely and making unhealthy sounds. [I] proceeded direct for the numbers at [the nearest] airport. ATC cleared me into class B airspace.I began to trouble shoot issue per poh engine roughness and tested both mags with a 125 drop in each. I set myself for a high approach should my engine fail. Engine roughness continued throughout flight. Landed safely.

Original NASA ASRS Text

Title: C172 Instructor Pilot reported landing safely after experiencing loss of power and engine vibrations.

Narrative: During climb lost 400 rpm with full throttle. Airspeed began to decrease; I took flight controls from student. I returned to level flight; rpm increased slightly; then back down to 2100 with full throttle.Engine began to shake intensely and making unhealthy sounds. [I] proceeded direct for the numbers at [the nearest] airport. ATC Cleared me into Class B airspace.I began to trouble shoot issue per POH engine roughness and tested both mags with a 125 drop in each. I set myself for a high approach should my engine fail. Engine roughness continued throughout flight. 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.