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services unit providing flight information service.
Note.- See Notes following 3.6.5.1.
4.10 An aircraft operated in accordance with the visual
flight rules which wishes to change to compliance with the
instrument flight rules shall:
a) if a flight plan was submitted, communicate the
necessary changes to be effected to its current flight
plan; or
b) elsewhere than as specified in 4.6 a), at a height less b) when so required by 3.3.1.2, submit a flight plan to the
than 150 m (500 Et) above the ground or water. appropriate air traffic services unit and obtain a
clearance prior to proceeding IFR when in controlled
Note.- See also 3.1.2. airspace.
ANNEX 2
CHAPTER 5. INSTRUMENT FLIGHT RULES
5.1 Rules applicable to all IFR flights
5.1.1 Aircraft equipment
Aircraft shall be equipped with suitable instruments and with
navigation equipment appropriate to the route to be flown.
5.1.2 Minimum levels
Except when necessary for take-off or landing, or except when
specifically authorized by the appropriate authority, an IFR
flight shall be flown at a level which is not below the minimum
flight altitude established by the State whose territory is
overflown, or, where no such minimum flight altitude has been
established:
a) over high terrain or in mountainous areas, at a level
which is at least 600 m (2 000 ft) above the highest
obstacle located within 8 km of the estimated position of
the aircraft;
b) elsewhere than as specified in a), at a level which is at
least 300 m (1 000 ft) above the highest obstacle located
within 8 km of the estimated position of the aircraft.
Note 1.- The estimated position of the aircraft will take
account of the navigational accuracy which can be achieved
on the relevant route segment, having regard to the navigationalfacilities
available on the ground and in the aircraft.
Note 2.- See also 3.1.2.
5.1.3 Change from IFR flight to VFR flight
5.1.3.1 An aircraft electing to change the conduct of its
flight from compliance with the instrument flight rules to
compliance with the visual flight rules shall, if a flight plan
was submitted, notify the appropriate air traffic services unit
specifically that the IFR flight is cancelled and communicate
thereto the changes to be made to its current flight plan.
5.1.3.2 When an aircraft operating under the instrument
flight rules is flown in or encounters visual meteorological conditions
it shall not cancel its IFR flight unless it is anticipated,
and intended, that the flight will be continued for a reasonable
period of time in uninterrupted visual meteorological conditions.
5.2 Rules applicable to IFR flights within
controlled airspace
5.2.1 IFR flights shall comply with the provisions of 3.6
when operated in controlled airspace.
5.2.2 An IFR flight operating in cruising flight in
controlled airspace shall be flown at a cruising level, or, if
authorized to employ cruise climb techniques, between two
levels or above a level, selected from:
a) the tables of cruising levels in Appendix 3; or
b) a modified table of cruising levels, when so prescribed
in accordance with Appendix 3 for flight above FL 410;
except that the correlation of levels to track prescribed therein
shall not apply whenever otherwise indicated in air traffic
control clearances or specified by the appropriate ATS authority
in Aeronautical Information Publications.
5.3 Rules applicable to IPR flights outside
controlled airspace
5.3.1 Cruising levels
An IFR flight operating in level cruising flight outside of controlled
airspace shall be flown at a cruising level appropriate to
its track as specified in:
a) the tables of cruising levels in Appendix 3, except when
otherwise specified by the appropriate ATS authority for
flight at or below 900 -m (3 000 ft) above mean sea level;
or
b) a modified table of cruising levels, when so prescribed
in accordance with Appendix 3 for flight above FL 410.
Note.- This provision does not preclude the use of cruise
climb techniques by aircraft in supersonic flight.
5.3.2 Communications
An IFR flight operating outside controlled airspace but within
or into areas, or along routes, designated by the appropriate
ATS authority in accordance with 3.3.1.2 c) or d) shall maintain
an air-ground voice communication watch on the appropriate
ANNEX 2 5-1 2411 1/05
Annex 2 - Rules of the Air Chapter 5
communication channel and establish two-way communication,
as necessary, with the air traffic services unit providing flight
information service.
- maintain an air-ground voice communication watch on
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