AMC3 ATS.TR.210(a)(3) Operation of air traffic control service
ED Decision 2020/008/R
VERTICAL
SPEED CONTROL INSTRUCTIONS — GENERAL
(a) In order to facilitate a safe and orderly flow of traffic, the air traffic controller may instruct aircraft to adjust rate of climb or rate of descent. The air traffic controller may apply vertical speed control between two or more climbing aircraft or two or more descending aircraft in order to establish or maintain a specific vertical separation minimum.
(b) The air traffic controller should, as far as practicable, limit vertical speed adjustments to those necessary to establish and/or maintain a desired separation minimum, and should avoid instructions involving frequent changes of climb/descent rates.
(c) When the flight crew inform the air traffic control unit concerned that they are unable to comply with a specified rate of climb or descent, the air traffic controller should apply an alternative method to achieve an appropriate separation minimum between aircraft, without delay.
(d) The air traffic controller should advise aircraft when a rate of climb/descent restriction is no longer required.
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