H500 HELI PLT IS OBSERVED LEAVING THE ACFT UNMANNED WITH THE ENG OPERATING AND THE ROTOR TURNING.

Narrative

ON JUN/MON/03; BTWN XA00Z AND XA15Z; THE PLT OF A HUGHES 500 (MIL DESIGNATION OH-6A) HELI; WAS OBSERVED WALKING AROUND HIS HELI; FOR 15 MINS; WITH ITS TURBINE ENG RUNNING AND ROTOR SPINNING AT IDLE ROTATION; WITH NO ONE AT THE CTLS. THE HELI WAS LOCATED 20 FT FROM A FENCE OF THE FBO AND 20 FT FROM A PARKED PILATUS PC12 ACFT WHOSE OWNER PLT AND HIRED PIC WERE WITNESSES AND PREPARING FOR DEP. THE PLT OF THE HELI WALKED AROUND THE BACK OF THE ACFT; THE SIDES AND THE FRONT WITH THE DOORS INSTALLED AND CLOSED. THE PLT WAS WEARING A COLOR SUIT. THE MGR OF THE FBO AT THAT TIME WAS ALSO A WITNESS AND COMMENTED THAT THE PLT OF THE HELI DOES THIS ALL THE TIME. SUGGESTIONS: THE PLT SHOULD REVIEW THE LIMITATIONS SECTION IN HIS MANUAL. THE STANDARD OPERATING PROCS OR COMPANY MANUAL SHOULD BE REVIEWED OR AMENDED TO INCLUDE ENG GND OP LIMITATIONS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT THE PLT APPEARED TO BE DOING A PREFLT OF THE HELI WHEN THE INCIDENT OCCURED. RPTR STATED THAT HE HAD SUBMITTED THE INFO ON THE FAA SFETY HOTLINE.