FACTOID # 21: 15% of Army recruits from South Dakota are Native American, which is roughly the same percentage for female Army recruits in the state.
 
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Encyclopedia > Hold (aviation)

A hold is an aeronautical maneuver that keeps an aircraft in a predetermined safe area while waiting for a clearance, weather, traffic, or any other delays. Composite satellite image showing the progress of a hurricane weather system approaching the east coast of America Weather comprises all the various phenomena that occur in the atmosphere of a planet. ...


The holding pattern

A standard holding pattern is shaped like an oval racetrack. After entering the hold, an aircraft usually flies for one minute inbound to a holding fix, performs a standard-rate right turn, flies outbound for a length of time so that the next inbound leg will also equal one minute, and then makes another turn inbound and proceeds back to the holding fix. These times are standard, but not ironclad; ATC can assign a hold with legs of any length of time. Additionally, aircraft with distance measuring equipment may be assigned holds with legs defined in nautical miles rather than minutes. An aircraft is any machine capable of atmospheric flight. ... A minute is: a unit of time equal to 1/60th of an hour and to 60 seconds. ... Air Traffic Control Towers (ATCTs) at Schiphol Airport Air traffic control (ATC) services are provided by ground based controllers responsible for directing aircraft on the ground and in the air to ensure safe and efficient traffic flow is maintained. ... Distance Measuring Equipment (DME) is a transponder-based radio navigation technology generally colocated at VORs. ... A nautical mile is a unit of distance, or, as physical scientists like to call it, length. ...


Hold entry

The entry to a hold is often the hardest part for a novice pilot to grasp. There are three standard types of entries: direct, parallel, and teardrop.

  • A direct entry is exactly what it sounds like: the aircraft flies directly to the holding fix, and immediately begins the first turn outbound.
  • In a parallel entry, the aircraft flies to the holding fix, parallels the inbound course for one minute outbound, and then turns back, flies directly to the fix, and proceeds in the hold from there.
  • In a teardrop entry, the aircraft flies to the holding fix, turns into the protected area, flies for one minute, and then turns back inbound, proceeds to the fix and continues from there.

Speed limits

Maximum holding speeds are established in order to keep aircraft within the protected holding area during their one-minute inbound and outbound legs. For civil aircraft (not military) in the United States, these airspeeds are:

  • At 6,000' MSL and below: 200 knots
  • From 6,001' to 14,000' MSL: 230 knots
  • At and above 14,001' MSL: 265 knots

With their higher performance characteristics, military aircraft have higher holding speed limits. A knot is a non SI unit of speed equal to one nautical mile per hour. ...


  Results from FactBites:
 
Hold - Wikipedia, the free encyclopedia (361 words)
In aviation, a hold is a predetermined maneuver that keeps an aircraft within a specified airspace while it awaits further clearance
In grappling or martial arts, a grappling hold is a specific grip applied to an opponent.
In telephony, a call may be placed on hold, in which case the connection is not terminated but no verbal communication is possible until the call is removed from hold.
Holding (aviation) - Wikipedia, the free encyclopedia (932 words)
In aviation, a holding (or hold) is an area of airspace used to delay aircraft already in flight.
The primary use of a holding is delaying aircraft that have arrived over their destination but cannot land yet because of traffic congestion, poor weather, or unavailability of the runway (for instance, during snow removal).
Holding entry procedures (which differ depending on the direction the aircraft enters the holding from), and accurately flying the holding, is an essential part of IFR pilot training, and will always be tested on examination flights.
  More results at FactBites »

 
 

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