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#1
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ORCA lower than MEA?
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 |
#2
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ORCA lower than MEA?
MEA is established by VOR reception when distance or
obstacles require an altitude higher than terrain clearance only requires. You may or may not be given a clearance, if radar coverage is not available. Buy or rent some oxygen equipment. "Dan" wrote in message ups.com... | 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 | |
#3
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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. |
#4
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ORCA lower than MEA?
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. |
#5
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ORCA lower than MEA?
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. |
#6
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ORCA lower than MEA?
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. |
#7
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ORCA lower than MEA?
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. |
#8
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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. MEA's are often higher because of the signal issues of the NAVAIDS involved. We got an airway here with a 9000' MEA which is way higher than the obstructions and the MVA because there's something wonky with the VOR that defines it. |
#9
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ORCA lower than MEA?
I (and just about everyone else these days) is using an IFR certified
GPS unit, but I suppose we'll be stuck with the VOR technology limits until ATC moves into the 20th century.... --Dan Ron Natalie 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. MEA's are often higher because of the signal issues of the NAVAIDS involved. We got an airway here with a 9000' MEA which is way higher than the obstructions and the MVA because there's something wonky with the VOR that defines it. |
#10
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ORCA lower than MEA?
Dan wrote:
I (and just about everyone else these days) is using an IFR certified GPS unit, but I suppose we'll be stuck with the VOR technology limits until ATC moves into the 20th century.... No you're not. If you're in radar coverage you can go direct to the other end of the airway (or anywhere else) at any appropriate minimum IFR altitude. The MEA isn't limitting unless you are using VOR's to fly the Victor airway. |
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