Can anyone explain how the fuel heaters are supposed to be used. I'm having trouble finding much information on them. I suspect that the fuel heat system is modeled in the CS 727, and that may have been the cause of my engine failure during a flight to Yellowknife in the North West Territories of Canada. It was cold. I have seen the three orange lights come on in the past, and I just turned the fuel heaters on and they went out. However, if I turn the fuel heaters off moments later, the lights come on again. I'm not sure if the heaters are supposed to remain on all the time. Either way, I forgot to turn the heaters on and that is the only conclusion I can come to.

Thanks,
Adam