A cessna pilot reported experiencing a significant in flight vibration in the right engine; which wa...

Narrative:

During power up; right engine slow to respond; but engine produced normal full power within 5 seconds. We elected to continue as normal engine parameters were observed. The plane operated as normal until cruise climb power was applied. When the props were brought back to 2450 RPM; the right engine began to vibrate severely. I pushed the props full forward and the vibration stopped. I then attempted applying a cruise climb RPM setting three more times with the same results. After a quick discussion; [name] and I elected to [notify ATC] for priority and return to ZZZ. We received vectors for the visual approach to runway xxr. During short final; the right engine began to slowly surge and lost 150 RPM at a time commanded. This happened twice before landing. We then taxied into the ramp with a fire rescue escort and had no trouble with the right engine while on the ground. Fuel flow throughout the entire flight was normal and steady for all stages of flight. Unknown cause.

Original NASA ASRS Text

Title: A Cessna pilot reported experiencing a significant in flight vibration in the right engine; which warranted an immediate return to the departed airport.

Narrative: During power up; right engine slow to respond; but engine produced normal full power within 5 seconds. We elected to continue as normal engine parameters were observed. The plane operated as normal until cruise climb power was applied. When the props were brought back to 2450 RPM; the right engine began to vibrate severely. I pushed the props full forward and the vibration stopped. I then attempted applying a cruise climb RPM setting three more times with the same results. After a quick discussion; [name] and I elected to [notify ATC] for priority and return to ZZZ. We received vectors for the visual approach to RWY XXR. During short final; the right engine began to slowly surge and lost 150 RPM at a time commanded. This happened twice before landing. We then taxied into the ramp with a fire rescue escort and had no trouble with the right engine while on the ground. Fuel flow throughout the entire flight was normal and steady for all stages of flight. Unknown cause.

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	1682521
Time
Date	201909
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.TRACON
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	Cessna Aircraft Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Engine
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Events
Anomaly	Aircraft Equipment Problem Critical

A cessna pilot reported experiencing a significant in flight vibration in the right engine; which warranted an immediate return to the departed airport.