52.70 Altimetry

52.70.2 Explain the altimeter setting requirements for flight under IFR. CAR 91 & AIP ENR

91.239 Altimeter settings 

(a) A pilot of an aircraft must maintain the cruising altitude or flight level of the aircraft by reference to an altimeter that is set in accordance with the following:

(1) when operating at or above flight level 150, set altimeter to 1013.2 hPa:

(2) when operating at or below 13 000 feet, set altimeter to the appropriate area QNH zone setting or aerodrome QNH altimeter setting:

(3) when operating between 13 000 feet and flight level 150, set altimeter to the appropriate area QNH zone setting as advised by an ATC unit.

(b) A pilot of an aircraft that is ascending or descending must set the altimeter in accordance with the following:

(1) when ascending above 13 000 feet, set altimeter to 1013.2 hPa:

(2) when descending through flight level 150, set altimeter to the appropriate area QNH zone setting or aerodrome QNH altimeter setting.

52.70.4 State the procedure to use to obtain an altimeter setting when QNH is not available prior to takeoff and the requirement to obtain a QNH once in flight. AIP ENR

AIP ENR 1.7 - 2

2 BASIC ALTIMETER SETTING PROCEDURES