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.

Atc aviation meaning