For climbing aircraft, even the best possible rate of climb may not be sufficient to ensure ay required traffic separation and for descending aircraft the chosen rate of descent is at the pilot's discretion and the degree of uncertainty about the vertical position will grow as time passes.Įxamples of proper and improper use of “expedite”:Įxample 4: Improper use – the safe outcome depends on the rate of descent chosen by the flight crew – 3000 ft/min will be enough while 2000 ft/min will be insufficient.Īnother example for the use of the word “expedite” in a time-critical situation is when an aircraft is requested to vacate (or to cross) a runway and to do so without delay. When using “expedite” in respect of the rate of climb or descent, a controller should remember that such an instruction is not a specific vertical speed. The controller’s expectations when the word expedite is used are that climbing aircraft will maintain the best rate of climb possible and that descending aircraft will achieve vertical speeds between 2000 fpm and 3500 fpm. The use of “expedite” implies that the action should start “now”. It provides a simple way to achieve vertical separation because the use of a single word instruction reduces the chances of an incorrect readback. The word “expedite” is used when a higher-than-normal rate of climb or descent is required. when the controller provides assistance in case of compass failure)Įxample 2: Using “immediately” to solve a conflict. Increase the precision of a manoeuvre (e.g.Resolve or prevent a potential conflict.The word “now” is used to indicate that the execution of the instruction is expected to commence at once in order to: The most commonly used words to indicate that a situation requires prompt action for safety reasons are “now”, “immediately” and “expedite”. ![]()
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