Citationjet (C525/C526) - CJ I / II / III / IV
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 67; Flight Crew Total 2846; Flight Crew Type 900
Situational Awareness; Distraction
Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Other / Unknown
Flight Crew Became Reoriented
Airport; Procedure; Weather
We were sitting on the ramp; immediately adjacent to the [local] flight school. It was a cold; fairly low IFR day so we were expecting to enter icing conditions immediately after takeoff. With the brakes locked; we started to add power to test the Anti-Ice/Deice Systems. Then we realized we were still on a very tight ramp; with small fixed-wing aircraft on the ramp behind us parked with their tail to our tail. We brought the power back to idle; however the jet blast may have caused damage to one or more of the small trainer aircraft parked behind us. In the future; we will ensure there is nothing behind us when increasing power above idle; and we will be moving our operations at this airport to a location that is well separated from the flight school's fleet of trainer aircraft.
The pilot of a corporate jet reported an increase of engine thrust while on the ramp to test the anti-ice system; then recognized that light aircraft were located relatively close behind the aircraft.