Flight instructor reported that the aircraft had a sudden drop in RPM after takeoff.

Attributes
ACN	1757281
Time
Date	202008
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	DA20 Undifferentiated
Operating Under FAR Part	Part 91
Flight Phase	Initial Climb
Component
Aircraft Component	Engine
Person 1
Function	Instructor
Qualification	Flight Crew Commercial Flight Crew Flight Instructor Flight Crew Instrument
Experience	Flight Crew Last 90 Days 40 Flight Crew Total 567 Flight Crew Type 200
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

On initial climbout at 1;000 MSL our aircraft had a sudden decrease in RPM to 1;200 and began shaking violently. Instructor seized the controls and turned around to land on the opposite runway; immediately [alerting ATC]. Power was restored on the descent and aircraft stopped shaking. The landing was made on xxr with no other issues.

Original NASA ASRS Text

Title: Flight Instructor reported that the aircraft had a sudden drop in RPM after takeoff.

Narrative: On initial climbout at 1;000 MSL our aircraft had a sudden decrease in RPM to 1;200 and began shaking violently. Instructor seized the controls and turned around to land on the opposite runway; immediately [alerting ATC]. Power was restored on the descent and aircraft stopped shaking. The landing was made on XXR with no other issues.

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.