Small Transport; Low Wing; 2 Recip Eng
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 200; Flight Crew Total 900; Flight Crew Type 250
Situational Awareness; Other / Unknown
Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Aircraft
Aircraft Aircraft Damaged
Airport; Human Factors; Procedure
After landing at I39 we parked our aircraft at the fuel pumps. Another aircraft had just refueled and moved to the north side of the pump pad. I went into the FBO to utilize the rest room facilities and my aircraft rolled across the fuel pad and struck the other aircraft in the tail tie down hook. The damage to both aircraft was only cosmetic in nature however the incident could have very easily caused major damage or injury. I did not realize that the fuel pad was constructed on a slope steep enough to allow a 10;000 LBS aircraft to begin to roll across it. My aircraft should have had the wheels blocked and or the parking brake set. The FBO Manager told me another aircraft rolled across the pad one day and went down over the hill causing substantial damage. While the cause of the incident was my failure to block the wheels of the aircraft; the contributing causes are the slope of the fuel pad at I39 and my failure to maintain an attitude of 'pilot in command' after the engine were shut down and I exited the aircraft.
A light twin aircraft's parking brake was not set after fueling at I39; which has a slightly sloped ramp. The aircraft rolled across the ramp and struck a Cessna; causing only superficial damage.