Originally Posted by Dust
Great to know that none of the heated pitots should be turned on in the plane while not flying in cool air, tanks Jonc
I'm not saying they shouldnt be turned on when on the ground.. Quite the contrary, you should always check to make sure it is working before flying when there is a chance of ice. However you should not run it for prolonged periods on the ground. Run it long enough to see that it is heating up, then turn it off. Or install a shunt in the supply line to it with an ammeter.
Most people don't realize that the pitot heat has failed until it ices over on them, which is not a good time to realize it.