SPEED ADJUSTMENT- An ATC procedure used to request pilots to adjust aircraft speed to a specific value for the purpose of providing desired spacing. Pilots are expected to maintain a speed of plus or minus 10 knots or 0.
Scan Instruction for Airspeed Adjustment
Airspeed set but VSI high or altitude low. Raise pitch and add power. Anytime airspeed is constant any change in pitch requires an opposite hand movement to change power.
This system issues landing clearances based on runway threshold arrival time. These times can be transmitted to an aircraft long before they are near the airport so any speed adjustments can be made and crews can plan optimal approach profiles.
 See also: Direct, Range, ILS, Runway, Air traffic
  
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