grazie x le delucidazioni..
comunque posto quel che ho trovato a proposito :
For RNAV approaches conducted with Baro-VNAV vertical profile navigation, waypoint crossing altitudes must be corrected (i.e., increased) for the low-temperature effect, either by (source – PANS-OPS and TERPS) :
• adding 4 % for every 10° C below the standard temperature; or,
• applying the correction provided in the appropriate Table.
Baro-VNAV procedures are not permitted when the aerodrome temperature is lower than the published lowest temperature for the procedure (source – PANS-OPS and TERPS) . Note
However, a conventional RNAV approach ( i.e., LNAV only ) is permitted below this temperature if :
• A corresponding RNAV procedure and corresponding OCA(H) is published; and,
• The appropriate low-temperature correction is applied to all published altitudes (heights), by the pilot.
ICAO PANS-OPS does not provide altitude corrections for extreme high temperatures.
Note
When operating under extreme high temperature, the temperature effect on the true altitude may result in a steeper-than-anticipated flight-path angle / vertical speed when performing a constant-angle non-precision approach.
Last edited by JQKA; 20th Sep 2012 at 21:00.