What are the SOPs, or "common practices", regarding selection of probe heat ON versus AUTO in certain conditions, even if icing is not common? In other words, what would be the typical selection for this particular route?
I ask because I continue to be intrigued by the possibility that at least two Pitot probes have failed almost simultaneously.
I would be also curious to know, how exactly the AUTO works. Maintain the probe temperature between two values? If so, what would be the typical duty cycle?