![]() When given to traffic whilst it is still airborne, it may indirectly encourage a long landing and when given to any aircraft whilst still at a high ground speed during the landing roll, it may represent a distraction to the pilot(s) at a critical time. The timing of any such instruction to landing traffic should also be considered carefully. 4444, 7.10.3.1 states: When necessary or desirable in order to expedite traffic, a landing aircraft may be requested to: d) expedite vacating the runway. However, caution should be used when issuing this instruction to a landing aircraft because the pilot may be unable to assess the extent of the implied urgency and may be indirectly encouraged to attempt to exit the runway at an inappropriately high speed or to continue along the runway to the first (but distant) exit at an inappropriately high speed which may then lead to directional control difficulties if ground speed is not reduced to that appropriate to the turn off. 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”. ATC clearance or instruction not properly complied with, including delayed pilot action.Wrong ATC clearance or instruction (e.g.Inadequate coordination between ATS sectors or units. ![]() Aircraft being unable to maintain the assigned level due to turbulence.There are also situations where things do not happen as intended, and prompt action becomes necessary. This sometimes means that the clearances have to be complied with without delay. ![]() ![]() Reasons for useĬontrollers are trained to plan the situation well in advance to achieve smooth flow of air traffic. ![]() The advice provided in this article shall not take precedence over applicable rules and local procedures. It also examines controllers’ and flight crews’ expectations regarding the use of “ now”, “ immediately” and “ expedite” in ATC clearances, and identifies associated safety issues. 9432 Manual on Radiotelephony and on the UK Manual of Radiotelephony CAP 413. This article is intended to provide information on the use of time-critical phraseology based on ICAO Doc. ![]()
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