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response when pilots transmit on the traffic frequency for the
aerodrome at which it is installed.
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GEN (GENERAL) A/L 45 effective 24 NOV 05
3.4.2 The features of the AFRU are as follows:
a. When the aerodrome traffic frequency has not been used for
the past five (5) minutes, the next transmission over two (2)
seconds long will cause a voice identification to be transmitted
in response, eg, “GOULBURN CTAF”.
b. When the aerodrome traffic frequency has been used within
the previous five (5) minutes, a 300 millisecond tone will be
generated after each transmission over two (2) seconds long.
3.4.3 A series of three (3) microphone clicks within a period of five (5)
seconds will also cause the AFRU to transmit a voice identification
for the particular aerodrome.
3.4.4 In the event that the transmitter in the AFRU becomes jammed for
a period of greater than one minute, the unit will automatically shut
down.
3.4.5 The operation of the AFRU provides additional safety
enhancements by confirming the operation of the aircraft’s
transmitter and receiver, the volume setting, and that the pilot has
selected the correct frequency for use at that aerodrome.
3.5 High Frequency Harmful Radio Interference
3.5.1 Domestic aeromobile HF communications in Australia are
sometimes subjected to periods of significant radio interference.
Consequently, strategies to alleviate this interference are being
actively pursued.
3.5.2 The harmful interference is generally being broadcast in a variety
of foreign languages and is not aviation related. Airservices
Australia has, therefore, procured a number of tapes with
recorded messages in a variety of languages and dialects. These
are used, as required, to advise the “target” that they are
transmitting on a frequency reserved for aviation communications,
and that they should cease transmitting.
3.5.3 Taped messages may run for up to three minutes. The selection of
which message(s) to transmit, and when to transmit, is controlled
by ATS staff as detailed in their local instructions. During the
broadcast of recorded messages, the frequency in use will not be
useable by the ATS centre controlling the broadcast, and aircraft
wishing to communicate on HF may need to change to an
alternative frequency, or wait until the broadcast is completed.
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GEN (GENERAL) A/L 45 effective 24 NOV 05
3.5.4 Minor delays in responding to VHF calls may also occur whilst HF
broadcasts are taking place. Broadcasts are made on a “workload
permitting” basis and ATS will terminate the broadcast if higher
priority HF or VHF communications are required.
3.6 Telephone Facilities
3.6.1 1-800 Service. 1-800 Service is available for direct-dial calls to
specified ATS units during the published operating hours.
3.6.2 Reverse Charge Calls. Airservices will bear the cost of
operator-connected calls of an urgent operational nature relating
to aircraft movements, and which should normally be directed to
the ATS unit associated with the airspace in which the aircraft is
operating, viz:
a. notification of departures and arrivals as specified elsewhere in
AIP; and
b. requests for ATC clearances and aeronautical information
essential to flight.
ATS unit telephone numbers are listed in ERSA.
3.6.3 Inmarsat Service. Inmarsat has been provided with telephone
numbers to facilitate pilot-initiated telephone communication with
ATC in Adelaide, Brisbane, Melbourne, Perth and Sydney via the
Inmarsat Transitional ATS Satellite Voice Service. This system
uses airborne satellite telephone equipment and abbreviated
dialling codes to dial ATC facilities around the world. It is available
only to aircraft fitted with a Future Air Navigation System (FANS).
Contact with Australian ATS Centres/Terminal Control Units
(TCUs) can be made by dialling the following abbreviated dialling
codes:
a. Adelaide TCU 450301
b. Brisbane Centre 450302
c. Melbourne Centre 450303
d. Perth TCU 450304, and
e. Sydney TCU 450305
Non-FANS equipped aircraft fitted with airborne satellite
telephone equipment can contact Australian ATS Centres/TCUs
by dialling the full telephone number as follows:
a. Adelaide TCU +61 8 8238 7988
b. Brisbane Centre +61 7 3216 3127
c. Melbourne Centre +61 3 9338 4032
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GEN (GENERAL) A/L 45 effective 24 NOV 05
d. Perth TCU +61 8 9277 1086
e. Sydney TCU +61 2 9556 6742
Communications using these services are restricted to urgent,
non-routine, safety-related matters.
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