FMC Cost Index
Joined: Jun 2001
Posts: 4,835
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From: Boldly going where no split infinitive has gone before..
It is established by dividing aircraft hourly cost (Crew, maintenance costs etc.) by the cost of fuel. The higher the fuel cost, the lower the cost index, and the closed Econ speed will be to maximum range.
Joined: Dec 2004
Posts: 42
Likes: 0
From: Far away from civilisation
Theoratically this would mean that for several destinations you would need a different CI, because of fuel price differences etc.
Is your company also using a fixed CI or do they have different ones for each destination ?
Is your company also using a fixed CI or do they have different ones for each destination ?
Last edited by Alaskan Timber; 11th December 2004 at 19:57.
Joined: Sep 1999
Posts: 5,552
Likes: 25
From: ME
Alaskan Timber, cost index will be different for every route due to the various fuel prices. We cheated in that we just settled on an average value based on all foreign destinations.
Red Comet, suggest you avoid cost index unless your airline has the manpower to maintain its accuracy, garbage in, garbage out, if wrong it will end up costing you money!
Mutt
Red Comet, suggest you avoid cost index unless your airline has the manpower to maintain its accuracy, garbage in, garbage out, if wrong it will end up costing you money!
Mutt
Per Ardua ad Astraeus
Joined: Mar 2000
Posts: 18,575
Likes: 4
From: UK
RC - my current operator has a pilot-accessible programme based on current fuel costs which does calculate CI, but, as Mutt says, it needs to be kept up-to-date or it is less reliable. I would not go so far as to castigate it as 'garbage' (
) should it be a tiny bit OOD, as it will still be broadly ok.
ATB
) should it be a tiny bit OOD, as it will still be broadly ok.ATB
Joined: Jul 2000
Posts: 474
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From: U.S.A.
Joined: Oct 2001
Posts: 308
Likes: 1
From: Australia.
There are other big picture costs to consider too.
RPT operations need to be able to publish a schedule and keep to it. If you then want to vary cost index on each flight depending on the vagaries of fuel prices you will surely incur other costs not considered by the CI concept.
Say the cost of fuel rises significantly over a short period of time and you therefore decide to use a lower cost index. You would have to ask some questions first...
How much does it cost to arrive later than the published schedule?
Would this not put pressure on passenger connections, aerobridge utilisation, ground staff resoucses, as well as on-time departure for the next service?
How much is THAT going to cost?
It's a can of worms!
RPT operations need to be able to publish a schedule and keep to it. If you then want to vary cost index on each flight depending on the vagaries of fuel prices you will surely incur other costs not considered by the CI concept.
Say the cost of fuel rises significantly over a short period of time and you therefore decide to use a lower cost index. You would have to ask some questions first...
How much does it cost to arrive later than the published schedule?
Would this not put pressure on passenger connections, aerobridge utilisation, ground staff resoucses, as well as on-time departure for the next service?
How much is THAT going to cost?
It's a can of worms!
Joined: Sep 1999
Posts: 5,552
Likes: 25
From: ME
Sorry BOAC but i stand by the "garbage in, garbage out" statement! 
Using operations/mx costs associated with a state run and totally overmanned airline combined with cheap fuel provides some extremely interesting cruise speeds!
The cost index formula is only as good as the information used for the calculation
Mutt.
Using operations/mx costs associated with a state run and totally overmanned airline combined with cheap fuel provides some extremely interesting cruise speeds!The cost index formula is only as good as the information used for the calculation
Mutt.
Mach 3
Joined: Aug 1998
Posts: 624
Likes: 1
From: Stratosphere
