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before take-off; or
b. after take-off, if not available or obtainable before take-off, provided
that the aircraft does not enter control area until cleared.
3.16 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 ETD, should be advised to ATC,
and a clearance requested before landing.
3.17 Clearances provided to pilots may include a “CLEARANCE VOID
TIME”. When 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.
3.18 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 the 30 minutes notification will be
processed on a “controller workload permitting” basis, and may be
subject to delay.
3.19 Airways Clearances
3.19.1 Other than as specified for PDC operations in para 3.22, pilots in
command must request an airways clearance:
a. on the clearance delivery frequency, preferably immediately
before starting engines, otherwise as soon as possible thereafter;
or
b. where a clearance delivery frequency is not available, before
entering the departure runway; and
c. before entering controlled airspace.
GEN TOC ENR TOC AD TOC Index
ENR (EN ROUTE) A/L 45 effective 24 NOV 05
3.19.2 Airways clearances normally contain the following items:
a. aircraft identification;
b. destination, area of operation, position or clearance limit;
c. route of flight;
d. assigned level;
e. for IFR flights, departure instructions;
f. SSR code; and
g. any additional instructions.
3.19.3 At night, or by day in IMC, the departure instructions for an IFR
flight from an aerodrome within a CTR will be in the form of a SID.
Where these are not published, or where aircraft or ground based
navigation aid(s) are unavailable, tracking instructions will be specified
by ATC.
3.19.4 Should a change of runway occur which affects an airways clearance
previously issued, ATC will issue a new SID or tracking instructions
as appropriate. A new clearance will not necessarily be
issued where the same clearance applies to multiple runways.
3.19.5 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.
3.19.6 When an aircraft leaves controlled airspace, a further clearance
must be obtained for any subsequent flight in controlled airspace.
3.20 Conditional Clearances
3.20.1 ATS may issue a conditional clearance for aircraft or vehicles to
enter or cross an active runway when the traffic situation precludes
immediate access. Aircraft issued a conditional clearance to enter
or cross an active runway must identify the vehicle or aircraft causing
the conditional clearance.
3.20.2 A conditional clearance will only be issued when:
a. the controller, the pilot, and/or the vehicle driver can see all aircraft
or vehicles concerned; and
b. the controller can visually monitor this traffic until the condition
is no longer applicable.
GEN TOC ENR TOC AD TOC Index
ENR (EN ROUTE) A/L 45 effective 24 NOV 05
3.21 Airways Clearances – Volcanic Ash
3.21.1 For aircraft departing Australia, clearances will not be issued via
airways which pass over active volcanoes during the currency of
local volcanic action NOTAM.
3.21.2 Pilots planning to enter Australian airspace during the presence of
volcanic ash clouds should make provision for additional fuel to
meet possible diversions around the hazard.
3.22 Pre-Departure Clearance (PDC)
3.22.1 PDC delivery via airline host computer is available from selected
Australian airports. Use of PDC is limited to operations authorised
by Airservices Australia. Operators wishing to participate in PDC
should submit such a request to Airservices Australia. Participating
operators must not delete any component of the PDC message
nor amend the order of the text.
3.22.2 PDC messages contain up to 11 lines of text depending on the
length of the route field and whether or not ATC adds additional remarks
or instructions following the transponder code.
Example:
PDC 060403
AAA123 B763 YPPH 0430
CLEARED TO VHHH VIA
NAMBU ONE DEPARTURE: NAMBU1
ROUTE: MRW R592 OLW R592 CEDAR R592
BLI B584 ELANG B584 GORPU T
MAINTAIN: 6000
DEPARTURE FREQUENCY: 118.700
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