VMCA From , joined Dec 1969, posts, RR:
Reply 3, posted (6 years 10 months 1 week 4 days 6 hours ago) and read 19033 times:
Please be careful with respect to what DescendVia is posting. The cost index he is referring to is only for the airline he is associated with. The cost components will vary from one airline to the next.
This is the formula for the Airbus CI
C = CF x �F + CT x �T + Cc
with CF = cost of fuel per kg
CT = time-related cost per minute of flight
Cc = fixed costs independent of time
�F = trip fuel
�T = trip time
Time related costs are variable from airline to airline and that's the trade-off with the CI. You can minimize the fuel burn or the time it's a trade off. So, it's more than just the price of fuel.
767nutter From United Kingdom, joined Sep 2008, 161 posts, RR: 0
Reply 5, posted (6 years 10 months 1 week 1 day 23 hours ago) and read 18733 times:
Im just wondering what is available accross the whole network of FMGC's, some people are saying it is 0-999, others like VMCA are saying it is 0-100, yet someone mentioned it depends on which company provides the FMGC's, is this correct?
I know ( well partially ) what cost index does i just need to know the range of it is on the A320 family
Someone said it is 0-999 for the Smiths-Thales computers and 0-99 for the Honeywell Pegasus, and was told most airliners nowadays has the Smiths-Thales, it was only the earlier A320s that had Honeywell Pegasus, This correct?
Still won't change those values...... they will always be proportional to the computed values, what we pay for gas, and the FOM. Plus where did you hear about the switch?
I should better "explain" what MAX means for my vaules. Its not the MAX value able to be line selected, rather its the MAX value that should be used in flight in accordance to the FOM speed policy. The values I listed are the computed allowable limits for said week.
Interesting thing is, a new Cost Index procedure was just put into effect this week at our airline letting us know what the maximum time critical value allowed is (after approval) and that is 140 for the A319 and A320 so that might help out your question since I think the current model we have is something with Sexton in its name. Also if you care, the maximum value that can be LSed for the non-pip, pip, AFMC, and Pegasus is 9999. I'm not sure if the Airbus Pegasus is the same, since I don't know that much about the Airbus, but I don't see why it wouldn't.