Obstruction proximity indication system for an aircraft

Details Obstruction proximity indication system for an aircraft Obstruction proximity indication system for an aircraft

1988-11-09

1990-04-10

Orsino, Joseph A.

Communications: electrical

Aircraft alarm or indicating systems

Nonairplane

73178H, 244 1711, 340961, 362 62, 416 5, G08B 2100

Patent

active

049164457

ABSTRACT:
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.

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"Aircraft Illumination", AIEE paper, W. W. Davies, 6-1-44.

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