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level available for use above the transition altitude established
for the aerodrome(s) concerned. Where a common transition
altitude has been established for two or more aerodromes
which are so closely located as to require coordinated
procedures, the appropriate ATS units shall establish a
common transition level to be used at any given time in the
vicinity of the aerodrome and, when relevant, in the TMA
concerned.
Note.— See 4.10.3.2 regarding the determination of the
lowest usable flight level(s) for control areas.
4.10.3 Minimum cruising level for IFR flights
4.10.3.1 Except when specifically authorized by the
appropriate authority, cruising levels below the minimum
flight altitudes established by the State shall not be assigned.
4.10.3.2 ATC units shall, when circumstances warrant it,
determine the lowest usable flight level or levels for the whole
or parts of the control area for which they are responsible, and
use it when assigning flight levels and pass it to pilots on
request.
Note 1.— Unless otherwise prescribed by the State
concerned, the lowest usable flight level is that flight level
which corresponds to, or is immediately above, the established
minimum flight altitude.
Note 2.— The portion of a control area for which a
particular lowest usable flight level applies is determined in
accordance with air traffic services requirements.
Note 3.— The objectives of the air traffic control service as
prescribed in Annex 11 do not include prevention of collision
with terrain. The procedures prescribed in this document do
not therefore relieve the pilots of their responsibility to ensure
that any clearance issued by air traffic control units is safe in
this respect, except when an IFR flight is vectored by radar.
See Chapter 8, 8.6.5.2.
4.10.4 Provision of altimeter setting information
4.10.4.1 Appropriate ATS units shall at all times have
available for transmission to aircraft in flight, on request, the
information required to determine the lowest flight level which
will ensure adequate terrain clearance on routes or segments of
routes for which this information is required.
Note.— If so prescribed on the basis of regional air
navigation agreements, this information may consist of
climatological data.
4.10.4.2 Flight information centres and ACCs shall have
available for transmission to aircraft on request an appropriate
number of QNH reports or forecast pressures for the FIRs and
control areas for which they are responsible, and for those
adjacent.
4.10.4.3 The flight crew shall be provided with the
transition level in due time prior to reaching it during descent.
This may be accomplished by voice communications, ATIS
broadcast or data link.
4.10.4.4 The transition level shall be included in
approach clearances when so prescribed by the appropriate
authority or requested by the pilot.
4.10.4.5 A QNH altimeter setting shall be included in the
descent clearance when first cleared to an altitude below the
transition level, in approach clearances or clearances to enter
the traffic circuit, and in taxi clearances for departing aircraft,
4-10 Air Traffic Management (PANS-ATM)
1/11/01
except when it is known that the aircraft has already received
the information.
4.10.4.6 A QFE altimeter setting shall be provided to
aircraft on request or on a regular basis in accordance with
local arrangements; it shall be the QFE for the aerodrome
elevation except for:
a) non-precision approach runways, if the threshold is
2 metres (7 feet) or more below the aerodrome
elevation, and
b) precision approach runways,
in which cases the QFE for the relevant runway threshold shall
be provided.
4.10.4.7 Altimeter settings provided to aircraft shall be
rounded down to the nearest lower whole hectopascal.
Note 1.— Unless otherwise prescribed by the State
concerned, the lowest usable flight level is that flight level
which corresponds to, or is immediately above, the established
minimum flight altitude.
Note 2.— The portion of a control area for which a
particular lowest usable flight level applies is determined in
accordance with air traffic services requirements.
Note 3.— See Foreword, Note 2 to paragraph 2.1.
4.11 POSITION REPORTING
4.11.1 Transmission of position reports
4.11.1.1 On routes defined by designated significant
points, position reports shall be made by the aircraft when
over, or as soon as possible after passing, each designated
compulsory reporting point, except as provided in 4.11.1.3.
　
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