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Decision (Read 344 times)

May 10^th, 2010 at 6:50pm

Tyler012 Offline
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How do you get Decision Height? I'm looking at an IFR plate and I can't find it, is there some kind of general knowledge? (like always 1,000 MSL?)

Just a sample of my personal art.

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Reply #1 - May 10^th, 2010 at 7:15pm

Brett_Henderson Offline
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Tyler012 wrote on May 10^th, 2010 at 6:50pm:

How do you get Decision Height? I'm looking at an IFR plate and I can't find it, is there some kind of general knowledge? (like always 1,000 MSL?)

1000msl will have you flying underground at many airports Cheesy

( I'm sure you mean 100agl Wink

)

ANYway.. decision height (DH), and minimum descent altitude (MDA), are variables that vary by approach type, and airport's minimums.

Post the plate of your choice, and we'll walk through it.

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Reply #2 - May 10^th, 2010 at 7:29pm

Tyler012 Offline
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Yeah thats what I meant, sorry.

Sorry it's a little small.

Here are the minimums:

Just a sample of my personal art.

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Reply #3 - May 10^th, 2010 at 10:28pm

Brett_Henderson Offline
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OK.. everything you need, is at the bottom of the plate..

For an ILS, your DH is: 3482msl (200agl) in 1/2 mile visibilty, for all aircraft types.

For localizer ony: 3620msl (338agl) in 1/2 mile visibility for Aircraft types A,B,C.. same for D,E except 3/4 mile visibility

For 'Circle-to-land' (meaning you'll fly the ILS until you can see runways, and then pick the runway you wil land on) : It varies by aircraft type (A-B-C-D-E)

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Reply #4 - May 12^th, 2010 at 6:16pm

SaultFresh Offline
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Keep in mind though that those MDA's and DH's can change. I don't mean like, over time, they will change, because that's true too, but operating in cold weather conditions will change your IFR minimum altitudes. If you stay in Texas your whole aviation career, you may never experience it. But if you travel further North, where people experience sub-zero ground temperatures, then you have to, HAVE TO, do cold weather corrections to your IFR minimum altitudes. If you don't, you could end up in the ground.

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