Narrative:

I am a local 135 pilot based at ZZZ; us. Several of the employees and I routinely go to a local park that is about 1-2 mi west of the airfield to fly radio controled aircraft. On this particular evening around XA30; a military twin rotor helicopter flew over and a fellow employee was airborne flying his radio controled aircraft. Mine was on the ground at this time. The helicopter flew due west and climbed out well above 400-500 ft as it passed north of our flying field by approximately 1/2 - 1 mi. We thought nothing of it; as only 1 plane was airborne and was well south of his flight path. Additionally; the helicopter made no evasive maneuvers. We surmised he could not even see us. At around XB00 a sheriff's deputy showed up and advised us a military helicopter reported almost being hit by a radio controled aircraft. He detained us (4 in all) for about 1 hour then released us; advising no charges would be filed. Also noted by the officer was that it was a federal offence to fly radio controled aircraft near an airport; and a very bad idea in general. Being that all 4 of us were pilots; and having flown at other active airports before; it seemed a non issue; as we are familiar with the runway layout and takeoff/approach paths. The only concern at the time was avoiding overflt of the playgnd area and flying quietly. In the future; more thought will be given to selecting a flying field as well as total avoidance of any aircraft in the area -- military or civilian. The next time I so much as hear an aircraft nearby; my radio controled plane will be on the ground in a matter of seconds.

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Original NASA ASRS Text

Title: A PLT RPTS FLYING A RADIO CTLED MODEL AIRPLANE NEAR AN ARPT WITH A POLICE OFFICER SAYING THEY HAD CAUSED A CONFLICT WITH A MIL HELI.

Narrative: I AM A LCL 135 PLT BASED AT ZZZ; US. SEVERAL OF THE EMPLOYEES AND I ROUTINELY GO TO A LCL PARK THAT IS ABOUT 1-2 MI W OF THE AIRFIELD TO FLY RADIO CTLED ACFT. ON THIS PARTICULAR EVENING AROUND XA30; A MIL TWIN ROTOR HELI FLEW OVER AND A FELLOW EMPLOYEE WAS AIRBORNE FLYING HIS RADIO CTLED ACFT. MINE WAS ON THE GND AT THIS TIME. THE HELI FLEW DUE W AND CLBED OUT WELL ABOVE 400-500 FT AS IT PASSED N OF OUR FLYING FIELD BY APPROX 1/2 - 1 MI. WE THOUGHT NOTHING OF IT; AS ONLY 1 PLANE WAS AIRBORNE AND WAS WELL S OF HIS FLT PATH. ADDITIONALLY; THE HELI MADE NO EVASIVE MANEUVERS. WE SURMISED HE COULD NOT EVEN SEE US. AT AROUND XB00 A SHERIFF'S DEPUTY SHOWED UP AND ADVISED US A MIL HELI RPTED ALMOST BEING HIT BY A RADIO CTLED ACFT. HE DETAINED US (4 IN ALL) FOR ABOUT 1 HR THEN RELEASED US; ADVISING NO CHARGES WOULD BE FILED. ALSO NOTED BY THE OFFICER WAS THAT IT WAS A FEDERAL OFFENCE TO FLY RADIO CTLED ACFT NEAR AN ARPT; AND A VERY BAD IDEA IN GENERAL. BEING THAT ALL 4 OF US WERE PLTS; AND HAVING FLOWN AT OTHER ACTIVE ARPTS BEFORE; IT SEEMED A NON ISSUE; AS WE ARE FAMILIAR WITH THE RWY LAYOUT AND TKOF/APCH PATHS. THE ONLY CONCERN AT THE TIME WAS AVOIDING OVERFLT OF THE PLAYGND AREA AND FLYING QUIETLY. IN THE FUTURE; MORE THOUGHT WILL BE GIVEN TO SELECTING A FLYING FIELD AS WELL AS TOTAL AVOIDANCE OF ANY ACFT IN THE AREA -- MIL OR CIVILIAN. THE NEXT TIME I SO MUCH AS HEAR AN ACFT NEARBY; MY RADIO CTLED PLANE WILL BE ON THE GND IN A MATTER OF SECONDS.

Data retrieved from NASA's ASRS site as of January 2009 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.