CAP 413
Radiotelephony Manual
Chapter 9 Page 4
1.6.7
It is permissible for aircraft operating agency messages to be handled by the
aerodrome communication facility provided this can be achieved without interference
with its primary role and no other channels are available for the handling of such
messages.
1.6.8
Public correspondence messages are not permitted on VHF frequencies in the
aeronautical mobile service.
1.7
Use of ATS Frequencies for Aircraft Operating Agency Messages
1.7.1
When requested by a company representative, controllers may transmit specific
operational messages to aircraft subject to normal air traffic service requirements and
shall prefix the transmission "Company advise/request….". When passing such
messages the controller must ensure that doing so will not compromise the safe
provision of an air traffic service and such messages should not be passed when they
could act as a distraction to pilots during critical phrases of flight.
1.7.2
Where messages of a technical and complicated nature are involved it may be found
advisable to permit direct speech between the originator of the message and the
pilot. In such cases the company's representative may be permitted to use the RTF
himself provided that his identity is announced before the message is passed and that
the controller continues to monitor the frequency.
1.7.3
A message affecting the safety of an aircraft in flight, e.g. bomb warning, suspected
damage to the aircraft etc., is to be passed to the commander immediately using the
company representative's precise wording. An abbreviation or précis could be
misunderstood and lead to a wasteful operation or even a dangerous situation.
1.7.4
Prolonged company messages could prevent controllers from providing a safe air
traffic service and the use of a discrete frequency for the passing of such messages
should be considered.
1.8
8.33 kHz Phraseology
1.8.1
As a solution to severe VHF spectrum congestion, ICAO has split the VHF
communications band from 25 kHz to 8.33 kHz channel spacing.
1.8.2
The following phraseology shall only be used when referring to 8.33 kHz channels to
request the capability of the radio equipment:
or
1.8.3
To request UHF capability:
BIGJET 347,
confirm eight point
three three
BIGJET 347,
affirm eight point three
three
BIGJET 347,
negative eight point
three three
BIGJET 347, confirm UHF
BIGJET 347,
affirm UHF
31 March 2011
Summary of Contents for 413
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