If appropriate, the controller may also address a specific traffic:.
If the controller needs to impose radio silence, the following general call is used:Īll stations stop transmitting.
This section contains phraseology to be used for imposing and terminating radio silence. Whether radio silence will be imposed and if so, which method will be used, is decided by the controllers involved based on the specific circumstances. The transfer may be done using a single "all stations" call (see Phraseology section below as well as the Notes) or by transferring each aircraft using a separate instruction. A near midair collision results in a crash in the Amazon and an improvement to on board collision avoidance systems. Transferring the distress traffic is considered inappropriate because (a) the stress and workload levels in the cockpit are already high and (b) in such situations the possibility for human error is greater and may lead to loss of communicaiton.
Transferring the communicaiton with the rest of the aircraft to other frequency (or frequencies).
Aircraft requested to maintain radio silence are expected to do so until advised that the emergency situation has been resolved.
Suppressing the calls from other aircraft on the frequency.
There are two ways to ensure radio silence:
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Navigational assistance (which is sometimes necessary during emergencies) requires considerable time spent on communication.
Exchange of information (pilots elaborating on the situation and controllers providing useful information) is easier.
The purpose of radio silence is to ensure the frequency channel is available exclusively to the aircraft in distress so that better service is provided: A look at accidents that involve radio silence as a result of either a loss of pressurization or a structural failure. Imposition of radio silence is a procedure that is sometimes used in case of aircraft emergency.
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