ORCA lower than MEA?

Dan wrote:

There are some places on IFR enroute charts where the OROCA (Off-route
obstruction clearance altitude) is actually lower than MEAs on an
airway in the same quadrant. The higher MEA is NOT due to obstacles in
adjacent quadrants.

If I'm on the airway, usually they don't let folks go down to the MOCA,
however if I file direct off-airways, how likely am I to be able to get
the ORCA? The goal is trying to stay below oxygen altitudes in
mountainous terrain while remaining IFR.

--Dan

When you go off-route the center will use is minimum instrument altitude
(MIA) chart. ATC will not use ORCAs; those are a concept that never
went anywhere other than to provide you with some information for
emergency or lost comm use.

Also, you can run into issues if you try to go direct through one of
those many chunks of Class G airspace in the western part of the country.

I don't suppose this MIA information is avaliable or published
somewhere is it? It would be useful for flight planning.

--Dan



Sam Spade wrote:
Dan wrote:

There are some places on IFR enroute charts where the OROCA (Off-route
obstruction clearance altitude) is actually lower than MEAs on an
airway in the same quadrant. The higher MEA is NOT due to obstacles in
adjacent quadrants.

If I'm on the airway, usually they don't let folks go down to the MOCA,
however if I file direct off-airways, how likely am I to be able to get
the ORCA? The goal is trying to stay below oxygen altitudes in
mountainous terrain while remaining IFR.

--Dan

When you go off-route the center will use is minimum instrument altitude
(MIA) chart. ATC will not use ORCAs; those are a concept that never
went anywhere other than to provide you with some information for
emergency or lost comm use.

Also, you can run into issues if you try to go direct through one of
those many chunks of Class G airspace in the western part of the country.

Dan wrote:
I don't suppose this MIA information is avaliable or published
somewhere is it? It would be useful for flight planning.

No, they guard that stuff like it belongs only to them.

Sam Spade wrote:
Dan wrote:

I don't suppose this MIA information is avaliable or published
somewhere is it? It would be useful for flight planning.

No, they guard that stuff like it belongs only to them.




More drivel.

Newps wrote:


Sam Spade wrote:

Dan wrote:

I don't suppose this MIA information is avaliable or published
somewhere is it? It would be useful for flight planning.

No, they guard that stuff like it belongs only to them.





More drivel.

Rather than just making such a cavalier statement, why not be positive
and point us pions to the public source for MIA charts.

Sam Spade wrote:
Newps wrote:



Sam Spade wrote:

Dan wrote:

I don't suppose this MIA information is avaliable or published
somewhere is it? It would be useful for flight planning.

No, they guard that stuff like it belongs only to them.






More drivel.


Rather than just making such a cavalier statement, why not be positive
and point us pions to the public source for MIA charts.

I have no idea if there is a website with all the data. I have
occasionally come across various MVA or MIA maps online. But nobody
guards it as it isn't sensitive. Stop by any facility and they'll make
a copy for you.

Newps wrote:


Sam Spade wrote:

Newps wrote:



Sam Spade wrote:

Dan wrote:

I don't suppose this MIA information is avaliable or published
somewhere is it? It would be useful for flight planning.

No, they guard that stuff like it belongs only to them.







More drivel.



Rather than just making such a cavalier statement, why not be positive
and point us pions to the public source for MIA charts.


I have no idea if there is a website with all the data. I have
occasionally come across various MVA or MIA maps online. But nobody
guards it as it isn't sensitive. Stop by any facility and they'll make
a copy for you.

There is no web site with MIA data. I had to make a Freedom of
Information Act request to get MIA data for a couple centers. The group
I work with had the same problem with MVAs, but got those loosened up.

What you are saying is true, but it means stopping by the facility with
one's hat in their hand. That does not help the OP at all.