Omni Directional Departures

[flipster]

Ladies and Gents,

In parts of the EU (eg France), airfields publish 'omnidirectional departures' as well as SIDs; an omnidirection departure is basically a turn after 500ft agl, direct to a waypoint or beacon. What separation criteria should ATC apply to an commercial aircraft departing on an IFR flight plan? Or is it that the separtion critera dependent on the class of airspace that makes up the ATZ?

Thanks

Flipster

[A7700]

You mean separation with another IFR on the same track ?

[flipster]

Actually, separation against IFR or VFR

[Spitoon]

Not sure how France (or other countries) deals with ATZs but the separation that you need to achieve is determined, in part anyway, by the airspace class - for example in class D you don't separate IFR from VFR.

If you have two aircraft that need separating, you need to apply any one of the standard separations that work - ideally you pick the most efficient. Vertical is usually the easiest but half the fun is finding some other way that can get both aircraft climbing as quickly as possible.

[DFC]

Omnidirectional departure procedures simply means that someone has taken the time to check the obstacles all round the departure aerodrome rather than simply along the defined track in the case of a SID. Just like on a SID, if the standard climb gradient does not acheive the required obstacle clearance the the gradient is increased or other restrictions are put in place.

As far as separation is concerned, that is a separate issue as is obstacle clearance in the event of an engine failure.

[flipster]

Thanks

I guess that answers my question!
TVM