Clima

Hi, I'm hoping someone can help. You all seem a knowledgeable bunch on here...

I'm trying to find out the following information for a project I'm working on at the moment:

• What is the radius to the flight path that is commonly used to include alternate stations within a flight plan. I've been quoted 75 nautical miles but also understand it may differ according to aircraft type and is probably specific to each airline. If you can share your knowledge with me, then great.
• Is there a list somewhere of each airfield and the aircraft type they can accommodate or is the task of finding this out something I'll have to try and delegate!

Many thanks in advance for those who respond.

Clima

kingofwww

Alternate Enroute Airports or alternate airports

As in the ATC flight plan you would normally only enter in the Alternates and the Reclear airports and an alternate enroute airport is usually only in the OFP.
the alternate enroute airport depaends on many factors, namely:
1. Aircraft performance
2. On route MORA
3. Airport facilities
As a rule of thumb if your not ETOPs certified the enroute alternate would be the one hour rule from flight path, but this could be varied if the terrain clearance on route for the drift down profile doesn't accept it.
Also another important criteria for selecting your enroute alternate is the fact that the airport should be acceptable to land on for your aircraft performance and the emergency services provided by the selected airport.

Hope this helps

Lauderdale

And then off course there is the en-route alternate airport to reduce your contingency down from 5% to 3% (no.....not the same as a Reclear!)

In this case the enroute alternate aerodrome must be located within a circle, radius equal to 20% of the total flight plan distance, centred at a distance equal to 25% of the total route distance from the destination or 20% +50nm, which ever is the greater!

firdaus787

kingofwww,

what is the meaning of 'On route MORA'???

Lauderdale

Minimum Off Route Altitude

OCNL EMBD

It's an adequate apt along the route, which may be required at the planning stage.

E.R.A. 3% ERA POSITION DISTANCES TO BE CALCULATED IN STILL AIR CONDITIONS
that's what lauderdale meant.
As per new EU-OPS requirements.

The correct therm to use for reclear will be RCF

Happy plannings
OCNL