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to clear aircraft to a specified point during a specified period.
4.5.6.1.2 After the initial clearance has been issued to an
aircraft at the point of departure, it will be the responsibility of
the appropriate ATC unit to issue an amended clearance
whenever necessary and to issue traffic information, if
required.
4.5.6.1.3 When so requested by the flight crew, an
aircraft shall be cleared for cruise climb whenever traffic
conditions and coordination procedures permit. Such clearance
shall be for cruise climb either above a specified level or
between specified levels.
Chapter 4. General Provisions for Air Traffic Services 4-5
1/11/01
4.5.6.2 CLEARANCES RELATING TO
SUPERSONIC FLIGHT
4.5.6.2.1 Aircraft intending supersonic flight shall,
whenever practicable, be cleared for the transonic acceleration
phase prior to departure.
4.5.6.2.2 During the transonic and supersonic phases of a
flight, amendments to the clearance should be kept to a
minimum and must take due account of the operational
limitations of the aircraft in these flight phases.
4.5.7 Description of air traffic control clearances
4.5.7.1 CLEARANCE LIMIT
4.5.7.1.1 A clearance limit shall be described by
specifying the name of the appropriate significant point, or
aerodrome, or controlled airspace boundary.
4.5.7.1.2 When prior coordination has been effected with
units under whose control the aircraft will subsequently come,
or if there is reasonable assurance that it can be effected a
reasonable time prior to their assumption of control, the
clearance limit shall be the destination aerodrome or, if not
practicable, an appropriate intermediate point, and coordination
shall be expedited so that a clearance to the destination
aerodrome may be issued as soon as possible.
4.5.7.1.3 If an aircraft has been cleared to an
intermediate point in adjacent controlled airspace, the
appropriate ATC unit will then be responsible for issuing, as
soon as practicable, an amended clearance to the destination
aerodrome.
4.5.7.1.4 When the destination aerodrome is outside
controlled airspace, the ATC unit responsible for the last
controlled airspace through which an aircraft will pass shall
issue the appropriate clearance for flight to the limit of that
controlled airspace.
4.5.7.2 ROUTE OF FLIGHT
4.5.7.2.1 The route of flight shall be detailed in each
clearance when deemed necessary. The phrase “cleared via
flight planned route” may be used to describe any route or
portion thereof, provided the route or portion thereof is
identical to that filed in the flight plan and sufficient routing
details are given to definitely establish the aircraft on its route.
The phrases “cleared via (designation) departure” or “cleared
via (designation) arrival” may be used when standard
departure or arrival routes have been established by the
appropriate ATS authority and published in Aeronautical
Information Publications (AIPs).
4.5.7.2.2 The phrase “cleared via flight planned route”
shall not be used when granting a reclearance.
4.5.7.2.3 Subject to airspace constraints, ATC workload
and traffic density, and provided coordination can be effected
in a timely manner, an aircraft should whenever possible be
offered the most direct routing.
4.5.7.3 LEVELS
Except as provided for in Chapter 6, 6.3.2 and 6.5.1.5, use of
standard departure and arrival clearances, instructions included
in clearances relating to levels shall consist of the items
specified in Chapter 11, 11.4.2.5.2.2.
4.5.7.4 CLEARANCE OF A REQUESTED CHANGE
IN FLIGHT PLAN
4.5.7.4.1 When issuing a clearance covering a requested
change in route or level, the exact nature of the change shall
be included in the clearance.
4.5.7.4.2 When traffic conditions will not permit
clearance of a requested change, the word “UNABLE” shall be
used. When warranted by circumstances, an alternative route
or level should be offered.
4.5.7.4.3 When an alternative route is offered and
accepted by the flight crew under the procedures described in
4.5.7.4.2, the amended clearance issued shall describe the
route to the point where it joins the previously cleared route,
or, if the aircraft will not re-join the previous route, to the
destination.
4.5.7.5 READ-BACK OF CLEARANCES
4.5.7.5.1 The flight crew shall read back to the air traffic
controller safety-related parts of ATC clearances and instructions
which are transmitted by voice. The following items shall
always be read back:
a) ATC route clearances;
b) clearances and instructions to enter, land on, take off
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