. Except when, on the basis of regional air navigation agreements, a modified table of cruising levels based on a nominal vertical separation minimum of less than 600 meters (2000 feet) but not less than 300 meters (1000 feet) is prescribed for use, under specified conditions, by aircraft operating above FL290 within designated portions of the airspace.
. Magnetic track, or in polar areas at latitudes higher than 70 degrees and within such extensions to those areas as may be prescribed by the appropriate Air Traffic Service authorities. Grid tracks are determined by a network of lines parallel to the Greenwich Meridian superimposed on a polar stereographic chart in which the direction towards the North Pole is employed as the Grid North.
. Except where, on the basis of regional air navigation agreements, from 090 degrees to 269 degrees and from 270 degrees to 089 degrees is prescribed to accommodate predominant traffic directions and appropriate transition procedures to be associated therewith are specified.
7-18 AIR TRAFFIC CONTROL CLEARANCES -
Clearances shall contain positive and concise data and shall, as far as practicable, be phrased in a standard manner. In addition to aircraft identification, clearances shall contain the following in the order listed:
a. CLEARANCE LIMIT - A clearance limit shall be described by specifying the "Name" of the appropriate reporting point, or airport, or Controlled Airspace boundary.
b.
ROUTE OF FLIGHT - 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 Air Traffic Service authority and published in Aeronautical Information Publications.
c.
Levels of flight for the entire route or part thereof and changes of levels if required. Instructions included in clearances relating to levels shall consist of:
(1)
Levels at which specified reporting points are to be crossed when necessary.
(2)
The place or time for starting climb or descent, when necessary.
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