Robert Brodersen

As this document states, hard carbon deposits are only formed when flying above FL370 with the bleed air valves in the High position. A much better solution is to limit cabin temperature settings to 68F or below when operating above FL370 for more than 10 minutes. Cruise flight above FL370 is a low pilot workload environment and it is quite simple for single pilots to modify the temperature settings on the environmental control system. Being able to fly above FL370 is an important capability for this airplane. Topping dangerous weather systems, avoiding traffic, and improving the fuel efficiency are all good reasons to climb beyond FL370. One might think that pilots might forget to lower the temperature when flying above FL370, but they are just as likely to forget the FL370 limitation itself. Pilots flying the highly technical Avio system in the Eclipse500 are more than capable of memorizing a simple temperature limitation. Thanks for your consideration -- Bob Brodersen