Obstruction lights
Obstruction lights. Lights that can be found both on and off an airport to identify obstructions.
Obstructions
These man-made structures are usually tall radio towers, simply tall towers or they are very tall structures that are not specifically identified on the map. See the key below.
Obstructions
When selecting a field for an off field landing, don't forget to look for obstructions that aren't readily apparent. An electrical power line across the approach end of the selected field is a good example.
OBSTRUCTION - An object that exceeds a limiting height or penetrates an imaginary surface described by FAR Part 77.
OVERFLIGHT - An aircraft flight over a particular area.
Obstruction Angle: The angle between the horizontal and a line joining the highest obstruction in the approaches to an aerodrome to the nearest point of the appropriate runway.
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.
If obstructions at the edges are more than 5 ft. add to this 200 yd. a distance equal to twelve the height of the obstruction. For a permanent field 300 yd.
obst - obstruction.
OCH - obstacle clearance height. The lowest height above the elevation of the runway threshold or above aerodrome elevation used to establish compliance with obstacle clearance criteria in an instrument approach.
OBST
Obstacle, obstruction
OBSTACLE AVOIDANCE (OA)
Outside Air Temperature ...
You might run into obstructions.
Your ability to see distant landmarks is limited.
Your ability to receive VOR signals is limited.
Your ability to use your communications radio is limited.
With pilot lateral separation will most likely be used when referring to the distance from a fix, NAVAID, or obstruction.
Establishes standards for determining obstructions and conducting aeronautical studies to determine the potential effects of obstructions on air- craft operations.
Turbulence is created when an obstruction is placed in the path of the flow of air (wind). Obstructions like hills, buildings and trees produce small scale turbulence (eddies).
Most often the offset threshold is in place to give arriving aircraft clearance over an obstruction while still allowing departing aircraft the maximum amount of runway available.
Pick up the helicopter and look for any physical obstructions that may have gotten caught in the main and tail rotors. Pull off the tail rotor using a pair of pliers to slide it off the motor shaft, then pull away any tangled obstructions.
A strut, or any obstruction, on the top of the wing would interfere with the lift.
Air has viscosity
The natural question is "how does the wing divert the air down?
A map used in air navigation containing all or part of the following: topographic features, hazards and obstructions, navigation aids, navigation routes, designated airspace, and airports.
A brief AD list includes ones addressing weight and balance issues, slippage of shoulder harnesses, failure of up-elevator cables, and fuel-tank vent obstruction.
This can occur because of natural obstructions, or because the transmitter was shut down intentionally.
According to the National Weather Service, some of the obstructions to visibility include blowing and widespread dust, fog (including freezing fog and patchy fog), haze, mist, sand and blowing sand, smoke, blowing spray, and volcanic ash.
The pilot is responsible for seeing and avoiding other aircraft, terrain, and obstructions such as buildings and towers.
INSTRUMENT FLIGHT RULES: ...
Now use aileron or rudder to turn the aircraft toward any likely landing area--anywhere there's grass and no obstruction. (If you are new to the simulator, first pause and read "Making Turns" below.) ...
In some cases a localizer is at an angle to the runway usually due to obstructions around the airport. Localizers also exist in stand-alone instrument approach installations and are not always part of an ILS or Instrument Landing System.
The stretch must be flat, and you do not want any obstructions for at least 2 miles on either end.
The aircraft must be operating well, and you have to know the following (i.e., you need adequate instrumentation to obtain these readings) ...
Each approach is custom designed, and takes into account the radio navigation aids available, the various runway, and obstructions in the area. Minimum altitudes and visibilites for each approach are published.
Relatively short wings make the aircraft easier to taxi, especially when operating in an off-airport environment with obstructions, and requires less space for hangaring, while being easier to build, ...
 See also: Aircraft, Pilot, Flight, Speed, Direct
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