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All numbers as well as the unit used for the measurement of the atmospheric pressure (e.g., inches or hectoPascals, sometimes abbreviated as “hex”) should be indicated in the ATIS’ or air traffic controller’s transmission.

For example, an abbreviated transmission, by the air traffic controller, such as “altimeter setting six seven” can be interpreted by the pilots as 28.67, 29.67 or 30.67 in.Hg, or as 967 hPa.
Accurately indicating both the altimeter-setting unit and the full value of  the altimeter setting will prevent confusion or enable the detection and correction of  an altimeter-setting error.
When using inches of mercury (in.Hg), “low” should precede an altimeter setting of 28.XX in.Hg and “high” should precede an altimeter setting of 30.XX in.Hg.

The U.S. FAA accepts this practice, if deemed desirable by regional or local air traffic services.

 

Use of Metric Altitudes

Using metric altitudes in certain countries (such as the Russian Federation,  the Commonwealth of Independent States [CIS] and the People’s Republic of China) also requires the use of :
Metric altimeters; or,

Conversion tables (i.e., to convert published or assigned altitudes expressed in meters into feet, for setting a target altitude in the FCU ALT window or for reading  the altimeter).

Changing the Altimeter Setting in Climb or Descent

The transition altitude / level is the altitude / level :
Above which all aircraft are flying with the altimeter-setting (baro setting) set to  the standard (STD) reference (i.e., 1013 hPa / 29.92 In.Hg), and,

Below which all aircraft are flying with the altimeter-setting set to QNH or QFE. 

The transition altitude / level ensure that all aircraft flying within the same airspace fly with the same altimeter reference.
The transition altitude / level can be either:
Fixed for the whole country (e.g. 18000 ft /  FL 180 in the USA); or,

Variable, depending on QNH (as indicated in the ATIS message), e.g. :

LFBO ( Toulouse Blagnac ) approach charts :

“ TRANS ALT : 5000’ ”,

“ TRANS LEVEL : BY ATC ”.

Depending on the airline’s / flight crew’s usual area of operation, changing from fixed transition altitude / level to variable transition level may cause crew confusion and result in a premature or late setting of the altimeter reference.
Setting of Barometric-altimeter MDA / DA and Radio-altimeter DH

The barometric-altimeter MDA / DA or the radio-altimeter DH should be set in line with Airbus’ SOPs or company’s SOPs.
 
Approach
 Baro Altimeter
 Radio Altimeter
 
Visual
 
 
 
Non Precision Approach ( Non-ILS Approach )
　
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本文鏈接地址：Flight Operations Briefing Notes Supplementary Techniques Altimeter Setting - Use of Radio Altimeter(3)