An instructor pilot took the controls of their C-152 from his student went the engine began to run r...

Narrative:

I was conducting flight training in C-152 with a primary student; working specifically in the pattern.runway 24 was in use. Conditions were VMC; with a steady wind out of the west.after my student and I completed a touch and go in the left traffic pattern; tower requested that we offset our climb by 20 degrees to the left to accommodate a much faster C130 also working in the pattern.I heard the engine pitch decrease and advised my student to reapply full power. I then checked the throttle setting and found it to be at the maximum setting. The tachometer indicated only 1900 RPM. I applied carb heat with no alteration of RPM or engine pitch. The engine was sputtering as if wanting to shut down. We were barely climbing. I took over the aircraft and turned downwind; remaining close to the airport; in case the engine failed. The engine continued to sputter. Not certain if the engine would continue operating; I advised tower control that I was experiencing engine difficulties. When asked of my intentions; I decided that closed runway xx offered the best chance to land safely; towards midfield. Tower redirected traffic so that I could make a safe approach and landing.the engine never shut off; and I was able to taxi the aircraft to the ramp without further incident.

Original NASA ASRS Text

Title: An instructor pilot took the controls of their C-152 from his student went the engine began to run rough and at reduced power during a climbout from a touch and go. They advised the Tower of the power loss and landed safely on a closed runway.

Narrative: I was conducting flight training in C-152 with a primary student; working specifically in the pattern.Runway 24 was in use. Conditions were VMC; with a steady wind out of the west.After my student and I completed a touch and go in the left traffic pattern; Tower requested that we offset our climb by 20 degrees to the left to accommodate a much faster C130 also working in the pattern.I heard the engine pitch decrease and advised my student to reapply full power. I then checked the throttle setting and found it to be at the maximum setting. The tachometer indicated only 1900 RPM. I applied carb heat with no alteration of RPM or engine pitch. The engine was sputtering as if wanting to shut down. We were barely climbing. I took over the aircraft and turned downwind; remaining close to the airport; in case the engine failed. The engine continued to sputter. Not certain if the engine would continue operating; I advised Tower Control that I was experiencing engine difficulties. When asked of my intentions; I decided that closed runway XX offered the best chance to land safely; towards midfield. Tower redirected traffic so that I could make a safe approach and landing.The engine never shut off; and I was able to taxi the aircraft to the ramp without further incident.

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.

Attributes
ACN	1219292
Time
Date	201411
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Cessna 152
Operating Under FAR Part	Part 91
Flight Phase	Initial Climb
Flight Plan	None
Component
Aircraft Component	Engine
Person 1
Function	Pilot Flying Instructor
Qualification	Flight Crew Flight Instructor Flight Crew Instrument Flight Crew Commercial
Experience	Flight Crew Last 90 Days 195.5 Flight Crew Total 968.6 Flight Crew Type 504.8
Events
Anomaly	Aircraft Equipment Problem Critical

An instructor pilot took the controls of their C-152 from his student went the engine began to run rough and at reduced power during a climbout from a touch and go. They advised the tower of the power loss and landed safely on a closed runway.