dme error

Hootie

Hootie

Old Skool
is there an allowable error for dme? similar to vor checks? for some reason .5 nm comes to mind but I am curious to where I could find it. Thanks!
 
Yup. If you're within line-of-sight range (up to 199nm) of the VOR/DME or VORTAC, the accuracy should be within .5 nm or 3% of the distance, whichever is greater.

Reference AIM 1-1-7(b), according to my notes.
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Unless you have dual DME, how would you ever know if there is any error or discrepancy?
 
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Unless you have dual DME, how would you ever know if there is any error or discrepancy?

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If it's showing 86.7 nm and you have the airport w/ the VOR in sight?
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I'd say if it's showing a few miles or more than what the GPS is showing, it's screwy. You'd be able to tell if the error was more than the difference between "slant range" and "straight line," in many cases.
 
[ QUOTE ]
[ QUOTE ]
Unless you have dual DME, how would you ever know if there is any error or discrepancy?

[/ QUOTE ]

If it's showing 86.7 nm and you have the airport w/ the VOR in sight?
smile.gif


[/ QUOTE ]

Ummmm..........could be a really, really clear day?!?

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[ QUOTE ]
Unless you have dual DME, how would you ever know if there is any error or discrepancy?

[/ QUOTE ]

the black on yellow sign that accompanies VOT checkpoints have the correct distance on them and since they are on the ground there is no slant range error.


P.S. Thanks EatSleepFly!
 
If you are asking about if there is a required DME accuracy check for flying IFR, the answer is no. You don't even need DME unless above FL240. You probably already knew that though, thank you Dr. Gliem.
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If your asking at what error must the DME be rendered inop, I'm not sure.
 
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the black on yellow sign that accompanies VOT checkpoints have the correct distance on them and since they are on the ground there is no slant range error.

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I'd forgotten that DME info was available at a VOT. Thanks!
 
To check error on your DME you would use a cross radial to identify a fix and then cross reference your DME. Of course this wouldn't work if it was DME only fix. But if you had a GPS with RAIM and an updated database, you could do it with that too, as long as you understood the slant range distance.
 
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