"Bee" wrote in message
...
S Green wrote:


Have a look at the cold weather adjustments needed for instruments
approaches. As the temperature deviates from ISA whilst the altimeter
could be reading 200' you will actually be well under and enough to bust
a checkride. For example, an ISA deviation of -15C is an correction of
12'. approximately 4ft/1000ft for each C of difference. In this
case, -15C ISA is only a temperature of 0C or 32F.

That isn't done for instrument approaches in the U.S. except for VNAV
final segments on RNP SAAAR IAPs.

In Europe its the easiest way to fail an IR checkride by failing to
compensate for the ISA deviation in the winter and being deemed to have
busted the limits