초록 ▼

Visually observable safe limits for the proximity of an aircraft, such as a helicopter, to obstructions are provided by pairs of lights which provide collimated beams intersecting at limit points located radially outwardly of the arc of the helicopter rotor blades so that light scattered from the in

Visually observable safe limits for the proximity of an aircraft, such as a helicopter, to obstructions are provided by pairs of lights which provide collimated beams intersecting at limit points located radially outwardly of the arc of the helicopter rotor blades so that light scattered from the intersecting beams at the limit points provides the helicopter pilot with visual references of the rotor arc. Each light of each pair has a concave reflector and a lamp at the focal point of the reflector to provide the collimated beams and transparent plastic shields over the open ends of the reflectors have concavities in central portions to provide diverging beams that illuminate the obstructions.

대표청구항 ▼

A system for providing a visual indication of a safe limit of proximity between an aircraft and a stationary object, comprising: a first light source mounted on the fuselage of the aircraft and comprising collimation means for providing a collimated beam of light of a first selected color extending

A system for providing a visual indication of a safe limit of proximity between an aircraft and a stationary object, comprising: a first light source mounted on the fuselage of the aircraft and comprising collimation means for providing a collimated beam of light of a first selected color extending outwardly from the aircraft; and a second light source mounted on the fuselage of the aircraft and comprising collimation means for providing a collimated beam of light of a second selected color extending outwardly from the aircraft to intersect the collimated beam provided by the first light source at a selected proximity limit location outside the volume of space containing all portion of the aircraft.