Have there been any cases of collision/airprox of small drones with manned aircraft? Small civilian mini-drones such as the DJI Phantom or professional surveying drones are becoming increasingly widespread, raising concerns about the potential collision/airprox with manned aircraft (especially GA where flight altitude is typically relatively low).



Have there been actual cases of collision and/or dangerous airprox reported so far? What were the consequences?
CASA (Australia's aviation authorities) has a report on an airprox between a crop duster and a surveying mini-drone:


ATSB incident report