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Richard McDonald Woods

ALTN updates

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What is the event that causes the ALTN destinations list to be updated?

 

I believe that it's just time, but it could also be distance metrics to some of the airports on that list.

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Hi Richard:  Browse FCOMv2 Section 34. FMC communications is tailored by each airline. It can be manual or automatic and even pushed to the airplane by a dispatcher.

 

I've noticed the ALTN page can become "stale" and require manual updates, but I have not dug any deeper because I always set my own alternates based on selections made in PFPX.  I presume the airline has preferred alternates where they have negotiated with airport for landing fees, fuel, passenger services and so forth so unless you have a dire emergency where any runway will do then diversions will be to a preferred location. Thus, I'm managing the ALTN page along with FIXES and would find automatic updates of the ALTN information intrusive.

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I was querying the PMDG 777 mechanism.

 

As Dan mentioned, even that has options, but I had assumed you were asking about the automatic updates. In that case, I'll refer to my earlier statement in that I believe it's time or distance-based (seems more time to me, but I'm not 100% sure on that one).

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