A mooney pilot reported that a helicopter did a hover taxi less that 50 feet behind his aircraft.

Attributes
ACN	1576133
Time
Date	201809
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	M-20 B/C Ranger
Operating Under FAR Part	Part 91
Flight Phase	Parked
Flight Plan	IFR
Aircraft 2
Make Model Name	Helicopter
Flight Phase	Taxi Takeoff Landing
Person 1
Function	Single Pilot
Qualification	Flight Crew Commercial Flight Crew Instrument
Experience	Flight Crew Last 90 Days 30 Flight Crew Total 2100 Flight Crew Type 2100
Events
Anomaly	Conflict Ground Conflict Critical Deviation - Procedural Published Material / Policy Ground Event / Encounter Other / Unknown
Miss Distance	Horizontal 40 Vertical 0

Narrative:

After conducting an instrument proficiency flight we parked on the ramp and were having lunch at the on airport restaurant. At approximately XA15 a turbine powered helicopter hover taxied; landed; and departed behind my aircraft that was parked as directed by ground [control]. The distance from my aircraft to the helicopter was less than 50 feet and the flight control surfaces of my aircraft were being fully deflected in both directions for perhaps 45 seconds. This represented an unsafe situation with the potential to significantly damage my aircraft. Ground [control] should have required the helicopter to hover taxi and land a safe distance away from my aircraft and others parked in the vicinity. The helicopter pilot should have; in the absence of direction from the tower; hover taxied and landed much further away from parked light aircraft. There is plenty of open ramp space at [the airport] and the irresponsibility demonstrated by both the controller in the tower and the helicopter pilot should not be dismissed. As you can probably tell; I am more than a little angry over this incident.

Original NASA ASRS Text

Title: A Mooney Pilot reported that a Helicopter did a hover taxi less that 50 feet behind his aircraft.

Narrative: After conducting an instrument proficiency flight we parked on the ramp and were having lunch at the on airport restaurant. At approximately XA15 a turbine powered helicopter hover taxied; landed; and departed behind my aircraft that was parked as directed by ground [control]. The distance from my aircraft to the helicopter was less than 50 feet and the flight control surfaces of my aircraft were being fully deflected in both directions for perhaps 45 seconds. This represented an unsafe situation with the potential to significantly damage my aircraft. Ground [control] should have required the helicopter to hover taxi and land a safe distance away from my aircraft and others parked in the vicinity. The helicopter pilot should have; in the absence of direction from the tower; hover taxied and landed much further away from parked light aircraft. There is plenty of open ramp space at [the airport] and the irresponsibility demonstrated by both the controller in the tower and the helicopter pilot should not be dismissed. As you can probably tell; I am more than a little angry over this 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.