777 Anti Ice off below -40C?
Hi,
I've remembered that somewhere in the 777 FCOM, it was talking about the anti ice usage and that it had to be turned on below 10C when there is visible moisture........ and theres this part where they say the anti ice is not to be used below -40C (forgot it it was WAI or EAI and it this was the auto logic or it is a recommended switch to off).
Why would they not recommend to use anti ice below -40C? Is it something to do with there might be excessive ice and they might break off into the engine core causing damage or that opening the WAI/EAI valves would cause some sort of backflow of coolness/tube freezing leading to blockage/system malfunctions.