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GPS is still providing position information; or
(2) RAIM is not available when ATC requests GPS distance,
or if an ATC clearance or requirement based on GPS distance
is imposed; or
(3) the GPS receiver is in DR mode, or experiences loss of
navigation function, for more than one minute; or
(4) indicated displacement from track centreline exceeds
2NM.
c. If valid position information is lost (2D or DR Mode), or non-
RAIM operation exceeds 10 minutes, the GPS information is to
be considered unreliable and another means of navigation
should be used until RAIM is restored and the aircraft is
re-established on track.
d. Following re-establishment of RAIM, the appropriate ATS unit
should be notified of RAIM restoration prior to using GPS information.
This will allow ATC to reassess the appropriate
separation standards.
e. When advising ATS of the status of GPS, the phrases “RAIM
FAILURE” or “RAIM RESTORED” must be used.
On receipt of advice, ATC may adjust separation.
19.11 Avoiding Controlled Airspace
The pilot in command of an aircraft operating in Class G airspace,
or to the VFR in Class E airspace, must apply appropriate tolerances
to the flight path to ensure that controlled airspace, or restricted
areas, are not infringed.
In calculating whether an intended flight path may infringe controlled
airspace, the following navigational tolerances must be applied
to the intended flight path depending on method of navigation
used. These tolerances may be rounded up to the nearest half degree
for practical purposes:
NDB ±6.9°
VOR/TACAN ±5.2°
DR ±12°
Note: For DR tracking ±9 o may be used where initial track
guidance has been provided by NDB, VOR or TACAN and there is
GEN TOC ENR TOC AD TOC Index
ENR (EN ROUTE) A/L 45 effective 24 NOV 05
no subsequent change in track.
RNAV ±14NM
VISUAL (POWERED AIRCRAFT)
0 – 2,000 AGL ±1NM ( ±2NM by night)
2,001 – 5,000 AGL ±2NM ( ±3NM by night)
5,001 – 10,000 AGL ±4NM ( ±5NM by night)
VISUAL (GLIDERS)
0 – 10,000 ±5NM
VISUAL (ALL AIRCRAFT)
10,001 – FL200 ±8NM
FL205 – FL300 ±12NM
FL305 – FL400 ±16NM
GEN TOC ENR TOC AD TOC Index
ENR (EN ROUTE) A/L 45 effective 24 NOV 05
20. AIR ROUTE SPECIFICATIONS
20.1 The pilot in command must plan and conduct a flight in accordance
with the route specifications and applicable flight planning requirements
published in GEN 3.2 and ERSA GEN when:
a. proposing to operate under the IFR on any route segments, or
b. proposing flight in controlled airspace, unless otherwise authorised
by ATC.
20.2 The pilot in command is responsible for ensuring that the requirements
of Section 19. can be met.
20.3 When planning an IFR flight, the pilot in command of a multi-engined
aircraft must take into account the en route performance requirements
of CAO 20.7.1B, 20.7.2 or 20.7.4, as appropriate.
20.4 Where no route specification has been published in the relevant en
route chart, a route determined by the pilot in command, and, if in
controlled airspace, approved by ATC, will be planned.
20.5 SID/STAR details and instrument approach fixes/way-points for
Australian airports must not be included in flight notification contents.
Use of designated ATS routes and published location identifiers
or way-points must be used for notifying details of the route
to be flown.
20.6 Prior ATC approval is required for RNAV tracking on routes other
than those published in AIP.
20.7 The position reporting points for a route should be separated by a
distance approximately 30 minutes or 200NM apart, whichever is
least, and, when practicable, should be selected from those shown
on en route charts. Otherwise, the position reporting points should
be places named on VTC or WAC, and identifiable by radio or visual
means. To minimise confusion, when a position is reported over
a town which has a nearby aerodrome of the same name, the word
‘township’ must be used after the name in the text of the report.
20.8 For an area-type flight as distinct from route flying, the pilot of an
IFR flight or VFR flight in those circumstances identified in
ENR 1.10 may nominate scheduled reporting times. These
should be at half-hourly intervals. The pilot must specify the area’s
boundaries by means of a map provided with the flight notification
details.
20.9 A pilot in command must make sure, by reference to the forecast,
that the route selected for a VFR flight will enable the aircraft to be
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