C-172 flight instructor experienced engine roughness in flight.

Attributes
ACN	1646874
Time
Date	201905
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Flight Plan	None
Component
Aircraft Component	Engine Control
Person 1
Function	Instructor
Qualification	Flight Crew Flight Instructor
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

During the event; the aircraft experienced engine roughness 2 times. One of them being while recovering from stall and adding full power; RPM dropped and engine started to sound as if was going to fail. The second time was when we were approaching ZZZ for a full stop; starting the zzzzz arrival; the engine exhibit the same roughness.

Original NASA ASRS Text

Title: C-172 Flight Instructor experienced engine roughness in flight.

Narrative: During the event; the aircraft experienced engine roughness 2 times. One of them being while recovering from stall and adding full power; RPM dropped and engine started to sound as if was going to fail. The second time was when we were approaching ZZZ for a full stop; starting the ZZZZZ Arrival; the engine exhibit the same roughness.

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.