I was looking at the performance tables the other day and it gives a gross level off altitude and a net level off altitude in the event of losing one engine at altitude and drifting down. I understand that gross performance is reduced to net, but the differences are huge - in some cases gross and net altitudes differ by 9,000ft!
Could anybody help me understand why this large difference exists? Is is simply just that the numbers are factored to reduce gross performance to net or is there another additional factor at work here that I don't understand??
Hufty.