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destination aerodrome.
3.6.1.4 An aircraft operated on a controlled aerodrome
shall not taxi on the manoeuvring area without clearance from
the aerodrome control tower and shall comply with any
instructions given by that unit.
3.6.2 Adherence to flight plan
3.6.2.1 Except as provided for in 3.6.2.2 and 3.6.2.4, an
aircraft shall adhere to the current flight plan or the applicable
portion of a current flight plan submitted for a controlled flight
5/11/98
No. 34
Chapter 3 Annex 2 — Rules of the Air
13
unless a request for a change has been made and clearance
obtained from the appropriate air traffic control unit, or unless
an emergency situation arises which necessitates immediate
action by the aircraft, in which event as soon as circumstances
permit, after such emergency authority is exercised, the
appropriate air traffic services unit shall be notified of the
action taken and that this action has been taken under
emergency authority.
3.6.2.1.1 Unless otherwise authorized or directed by the
appropriate air traffic control unit, controlled flights shall, in
so far as practicable:
a) when on an established ATS route, operate along the
defined centre line of that route; or
b) when on any other route, operate directly between the
navigation facilities and/or points defining that route.
3.6.2.1.2 Subject to the overriding requirement in
3.6.2.1.1, an aircraft operating along an ATS route segment
defined by reference to very high frequency omnidirectional
radio ranges shall change over for its primary navigation
guidance from the facility behind the aircraft to that ahead of
it at, or as close as operationally feasible to, the change-over
point, where established.
3.6.2.1.3 Deviation from the requirements in 3.6.2.1.1
shall be notified to the appropriate air traffic services unit.
3.6.2.2 Inadvertent changes. In the event that a controlled
flight inadvertently deviates from its current flight plan, the
following action shall be taken:
a) Deviation from track: if the aircraft is off track, action
shall be taken forthwith to adjust the heading of the
aircraft to regain track as soon as practicable.
b) Variation in true airspeed: if the average true airspeed
at cruising level between reporting points varies or is
expected to vary by plus or minus 5 per cent of the true
airspeed, from that given in the flight plan, the
appropriate air traffic services unit shall be so informed.
c) Change in time estimate: if the time estimate for the
next applicable reporting point, flight information region
boundary or destination aerodrome, whichever comes
first, is found to be in error in excess of three minutes
from that notified to air traffic services, or such other
period of time as is prescribed by the appropriate ATS
authority or on the basis of air navigation regional
agreements, a revised estimated time shall be notified as
soon as possible to the appropriate air traffic services
unit.
3.6.2.2.1 Additionally, when an ADS agreement is in
place, the air traffic services unit (ATSU) shall be informed
automatically via data link whenever changes occur beyond
the threshold values stipulated by the ADS event contract.
3.6.2.3 Intended changes. Requests for flight plan
changes shall include information as indicated hereunder:
a) Change of cruising level: aircraft identification;
requested new cruising level and cruising speed at this
level, revised time estimates (when applicable) at
subsequent flight information region boundaries.
b) Change of route:
1) Destination unchanged: aircraft identification; flight
rules; description of new route of flight including
related flight plan data beginning with the position
from which requested change of route is to
commence; revised time estimates; any other
pertinent information.
2) Destination changed: aircraft identification; flight
rules; description of revised route of flight to revised
destination aerodrome including related flight plan
data, beginning with the position from which
requested change of route is to commence; revised
time estimates; alternate aerodrome(s); any other
pertinent information.
3.6.2.4 Weather deterioration below the VMC. When it
becomes evident that flight in VMC in accordance with its
current flight plan will not be practicable, a VFR flight
operated as a controlled flight shall:
a) request an amended clearance enabling the aircraft to
continue in VMC to destination or to an alternative
aerodrome, or to leave the airspace within which an
ATC clearance is required; or
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