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CONTROLLED AIRSPACE
Air traffic clearances are aimed at keeping an aircraft in controlled airspace, both
laterally and vertically, if the pilot has so planned. If a pilot is in doubt that the
clearance will keep the aircraft in controlled airspace, ATC should be advised and an
alternative clearance may be requested.
A pilot, desiring to retain control area protection during climb in Class C or Class D
airspace, should maintain at least 500FT above the lower limit of the CTA steps.
A control instruction issued after a clearance is obtained amends the appropriate item
in the clearance. When there is any change in the clearance limit and/or route
specified in the initial clearance, a completely new clearance will be issued.
Whenever a restriction or requirement has been imposed, and, subsequently,
a further restriction/requirement is imposed, the subsequent instruction will
cancel all previous restrictions/requirements unless:
• all restrictions/requirements are restated; or
• the subsequent instructions is prefixed “FURTHER REQUIREMENT”.
At a controlled aerodrome, clearance for operation in an adjoining control area is given
before departure.
500'
500'
500'
CONTROL AREA PROTECTION
234
Civil Aviation Safety Authority Australia
OPERATIONS
09/2001
3
CLEARANCES
SECTION
CONTROLLED AIRSPACE
If proposing to fly into a control area from an aerodrome located so close to
the entry point that making a full position report before entry is not
practicable, a clearance should be requested:
• at a convenient time before entering the runway for take-off at an aerodrome where
communication can readily be established before take-off; or
• after take-off, if not available or obtainable before take-off, provided that the aircraft
does not enter the control area until cleared.
If landing at an aerodrome with the intention of departing for a control area shortly
after landing, any revision of notified details relevant to the clearance, including
Estimated Time of Departure (ETD), should be advised to ATC,
and a clearance requested before landing.
Pre-departure clearances provided to pilots may include a ‘CLEARANCE VOID TIME”.
Where a void time is specified, the clearance is valid only if the flight enters controlled
airspace in accordance with the clearance at or before that time.
Pilots should submit details required for flight in controlled airspace at
least 30 minutes before the expected time of entry. Flight details
submitted with less than 30 minutes notification will be processed on
a “controller workload permitting” basis, and may be subject to delay.
AIRWAYS CLEARANCE
A pilot in command must request an airways clearance:
• before entering controlled airspace.
• on the clearance delivery frequency, preferably immediately before starting engines,
otherwise as soon as possible thereafter; or
• where a clearance delivery frequency is not available, before entering the departure
runway.
Airways clearances normally contain the following items:
• aircraft identification
• destination, area of operation, position or clearance limit
• route of the flight
• assigned level
• for IFR flights, departure instructions
• SSR code
• any additional instructions
235
Civil Aviation Safety Authority Australia
OPERATIONS
09/2001
3
CLEARANCES
SECTION
CONTROLLED AIRSPACE
If an aircraft is cleared only to an intermediate point, and flight beyond that point will
be in controlled airspace, a pilot in command must obtain a further clearance before
proceeding beyond the intermediate clearance point.
When an aircraft leaves controlled airspace, a further clearance must be obtained for
any subsequent flight in controlled airspace.
OPERATIONS IN CONTROLLED AIRSPACE
GENERAL RULES
The air traffic rules and procedures applicable to air traffic in Australia and its
Territories conform to Annexes 2 and 11 to the Convention on International Civil
Aviation and to those portions of the CASA Civil Aviation Regulations (CARs) and the
Civil Aviation Orders (CAOs) applicable to aircraft, except for the differences listed in
AIP GEN 1.7.
GENERAL
This section sets out the pilot action and related Air Traffic Services (ATS) activity in civil
and military controlled airspace.
For flight in close proximity to the boundary of controlled airspace, separation is not
provided with traffic operating outside controlled airspace.
CLASS C
GAAP MBZ
CLASS C
CLASS G
CLASS D
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VFR Flight Guide(82)
