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Obstruction lights
Occluded front
Occupant Position 16G Seat Testing Term ...
Obstruction Light: A light indicating the presence of an object which is dangerous to an aircraft in flight.
Obturator Ring: An L-section ring fitted round a piston to maintain a gas-tight seal between the piston and the cylinder wall.
OBSTRUCTION LIGHT- A light or one of a group of lights, usually red or white, frequently mounted on a surface structure or natural terrain to warn pilots of the presence of an obstruction.
A wide variety of activities are regulated by the FARs, such as airplane design, typical airline flights, pilot training activities, hot-air ballooning, lighter than air craft, man-made structure heights, obstruction lighting and marking, ...
 See also: Maintain, Plane, Direct, Obstruction, Runway
  
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