c.
ARRIVALS - If continuous descent from cruising Flight Level to an airport within the "Standard Pressure Region" is planned, set the altimeter to the current airport setting (QNH) immediately prior to commencing descent.

NOTE: Holding procedures shall be conducted with the altimeter at Standard Setting (QNE). Immediately prior to descending below the lowest Flight Level at which holding will be conducted, change the altimeter to the airport setting (QNH).
d. TRANSITION PROCEDURES - There are no designated Transition Levels/Altitudes in Canadian Airspace. When it is necessary to change the setting of an altimeter due to flight movement out of or into the "Altimeter Setting Region", such change shall always be made on the side of (within) the "Standard Pressure Region" immediately after leaving or prior to entering the "Altimeter Setting Region" whether the movement is lateral, climbing or descending. Normally, the pilot will receive the appropriate station altimeter setting (QNH) as part of his ATC clearance prior to commencing descent. If, for any reason, the QNH is not incorporated in the clearance, the pilot shall obtain same.
4. Altimeter overreadings (aircraft at lower level than the altimeter indicates) by as much as 3000’ can occur in the Standard Pressure Region when a combination of an unusually low atmospheric pressure and extremely low temperature are encountered along with a further "local drop" in pressure resulting from the increase in wind speed associated with Mountain Waves. Pilots should keep in mind that, when computing pressure drops from a given wind speed, the error is nearly twice as great in saturated air as it is in unsaturated air.
(NAV CANADA/GPH 204, CH 7, SEC 2)
VERTICAL SEPARATION - Semi-circular. For certain exceptions see the "CRUISING ALTITUDE DIAGRAMS" in Section "C" of the Canadian Flight Supplement. Also note on the Canada and North Atlantic Enroute Charts that the pointed end of the airway/air route identifier indicates direction of flight for even altitudes on the Enroute Low, and for "A" levels on the Enroute High. ATC, at their discretion, may assign an altitude not appropriate to these indicated directions of flight. For reason of icing, turbulence, operating limitations or fuel conservation a pilot may therefore request and, if feasible, ATC may assign an altitude not appropriate to the direction of flight. However, if the pilot initiates the request he is expected to advise ATC as soon as he is able to accept an altitude that is appropriate to the direction of flight.
(NAV CANADA/GPH 204, CH 8, SEC 1)

POSITION REPORTING - Standard except:
1.
For operations in the Northern and Arctic Control Areas see Special Procedures under Flight Planning.

2.
The pilot of an aircraft assigned an altitude NOT appropriate to the direction of flight will NOT be authorized by ATC to omit position reports when in a radar environment.
　
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