In article , Happy Dog wrote:
A recent thread on the Diamond Owners Website addressed the -20 degree
C limitation for the Diamond Star. According to Diamond, this is due
to temperature limitations on the avionics.

Yeah. I've heard this. But why the change with altitude?

At a rough guess, because at sea level you're likely to be just starting
out so everything's cold at that point. At 9000' you're flying, the
engine's hot, and you can provide enough heat to prevent the avionics
from going out of spec until a colder temperature.

--
Dylan Smith, Castletown, Isle of Man
Flying: http://www.dylansmith.net
Frontier Elite Universe: http://www.alioth.net
"Maintain thine airspeed, lest the ground come up and smite thee"