Quote:
Originally Posted by 80ktsClamp
Thats why we have the cost index system at DAL... apparently ASA has done the same. Cost index is a ratio for the cost of fuel compared to the cost of time. It just feeds you a cost index number and your mach automatically updates for any altitude, weight, and winds uploaded into the FMC.
Pretty snazzy... I used to use LRC frequently in the CRJ which was typically .68 mach with a 250 knot transition. I'd save a pile of gas and only end up running about 3-5 minutes slower than the normal .74/290 profile.
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PPAS does about the same thing as cost indexing. I believe it takes into account crew costs, fuel, mx, and other such factors...