As soon as it is known
that two-way communication has failed, action shall be taken to ascertain
whether the aircraft is able to receive transmission from the AERODROME CONTROL
TOWER unit or not.
If it apparent that there
is no response from the pilot to ATC instruction but AERODROME CONTROL TOWER is
still able to read any transmission from the pilot, it indicates that the
aircraft is experiencing receiver failure. In this situation AERODROME CONTROL
TOWER shall take the following actions :
a) clear other aircraft to avoid the route and/or altitude to be
flown by aircraft experiencing radio receiver failure, as necessary;
b) when information is received from the aircraft experiencing
radio receiver failure that it has passed any altitude/level,
recall other aircraft which occupies the altitude/level to return to original
route;
c) when information is received from the aircraft experiencing
radio receiver failure that it has established visual contact,
inform SEAHORSE APPROACH CONTROL OFFICE.
On the contrary, if there
is no pilot transmission as well as pilot
response to ATC instruction, it indicates that the
aircraft is experiencing transmitter failure or total radio failure. In this
situation, AERODROME CONTROL TOWER shall clear other aircraft to avoid the
route and/or altitude to be flown by aircraft experiencing radio failure.
If the aircraft fails to
indicate that it is able to receive and acknowledge transmissions,
separation shall be maintained between the aircraft having the communication
failure and other aircraft by providing flight information.
As soon as it is known
that two-way communication has failed, appropriate information describing the
action taken by AERODROME CONTROL TOWER, or instructions justified by any
emergency situation, shall be transmitted blind for the attention of the
aircraft concerned, on the frequencies available on which the aircraft is
believed to be listening, including the voice frequencies of available radio
navigation or approach aids. Information shall also be given concerning
meteorological conditions at suitable aerodromes.
Pertinent information
shall be given to other aircraft in the vicinity of the presumed position of
the aircraft experiencing the failure.
If circumstances indicate
that a controlled flight experiencing a communication failure might proceed to
(one of) the alternate aerodrome(s) specified in the filed flight plan, the ATS
unit(s) serving
the alternate aerodrome(s)
and any other ATS unit(s) that might be affected by a possible diversion shall
be informed of the circumstances of the failure and requested to attempt to
establish communication with the aircraft at a time when the aircraft could possibly
be within communication range.
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