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• fuel requirements;
• estimated times of arrival and departure;
• aerodrome information;
• maintenance and servicing of aircraft including the ordering of parts and materials
urgently required;
• Passenger requirements;
• unscheduled landings to be made by aircraft;
• and general weather reports.
This information is available to all aircraft during the times that Unicom is operating.
Weather reports, other than simple factual statements about the weather, may not be
provided by Unicom operators unless they are properly authorised to make weather
observations under CAR 120.
The Unicom operator is solely responsible for the accuracy of any information passed to an
aircraft, while the use of information obtained from a Unicom is at the discretion of the
pilot in command.
Unicom operators must comply with the requirement of CAR 83 (2).
Civil Aviation Safety Authority Australia
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OCTA
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GENERAL INFORMATION
203
OPERATIONS OUTSIDE CONTROLLED AIRSPACE
RADIO TELEPHONY REQUIREMENTS OUTSIDE CONTROLLED AIRSPACE
The callsign of the station of service being called must be included at the beginning
of each exchange on VHF and HF.
All transmissions between aircraft or when broadcasting intentions must be prefixed
with the aircraft callsign.
When requesting operational information on FIS frequencies, the pilot must use the
service callsign “FLIGHTWATCH”.
Use of the collective “All Stations” must precede a broadcast.
To help identify one aerodrome from another when there may be other traffic
operating to or from a nearby aerodrome, the aerodrome name must be included
at the beginning and end of each transmission when entering a MBZ or CTAF
area.
MANDATORY BROADCAST ZONE (MBZ) AND COMMON TRAFFIC
ADVISORY FREQUENCY (CTAF)
The frequencies to MBZ and CTAF are those on which pilots can arrange mutual
separation at non-controlled aerodromes. These frequencies are not normally
monitored by ATS.
MBZ
MBZ procedures apply within 15NM radius of a designated aerodrome, up to and
including 5,000FT AGL, unless otherwise specified. The carriage and use of radio is
mandatory for operations within the prescribed airspace surrounding an aerodrome
designated as an MBZ.
LOOK OUT
15NM
5000FT AGL
MBZ
656
204
Civil Aviation Safety Authority Australia
OPERATIONS
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NON-CONTROLLED AERODROMES
CTAF
CTAFs are used within 5NM radius of a designated aerodrome up to and including
3,000FT AGL, unless otherwise specified. At CTAF aerodromes, the carriage and use
of radio is not mandatory, but pilots of radio equipped aircraft are required to make
broadcasts on the CTAF.
In certain instances, the proximity of a number of non-controlled aerodromes, which
are subject to broadcast requirements, may warrant the designation of the combined
airspace surrounding the aerodromes as a single CTAF area.
AIP ENR 1.1 -38 (page 204) specifies the broadcast requirements for non-controlled
aerodromes where MBZ frequencies or CTAF have been prescribed. Frequencies for
MBZ/CTAF at particular aerodromes are shown in ERSA and ERC Low charts.
All aircraft arriving at or departing from an aerodrome within an MBZ, and all radio
equipped aircraft arriving at or departing from an aerodrome within a CTAF area, must
monitor the MBZ frequency or CTAF and make prescribed broadcasts.
All aircraft intending to transit an MBZ and all radio-equipped aircraft intending to
transit a CTAF area must broadcast aircraft type, position, actual level and intentions
before entering the MBZ or CTAF area.
Note: Pilots are reminded of their obligations to see and avoid other aircraft
(CAR 163A)
5NM
3000 FT AGL
CTAF
656
205
Civil Aviation Safety Authority Australia
OPERATIONS
09/2001
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MBZ/CTAF
SECTION
NON-CONTROLLED AERODROMES
COMMUNICATIONS
A pilot of other than an IFR RPT flight may nominate a SARTIME for departure either
as part of the arrival report or when submitting flight notification by the phrase
“SARTIME FOR DEPARTURE". SAR alerting action will be initiated if a report is not
received by the nominated SARTIME for departure.
206
Civil Aviation Safety Authority Australia
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COMMUNICATIONS
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NON-CONTROLLED AERODROMES
SUMMARY OF REPORTS AND BROADCASTS – VFR AIRCRAFT IN CLASSES E
AND G AIRSPACE
Situation Frequency to Remarks
Taxiing MBZ/CTAF Broadcast
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VFR Flight Guide(72)
