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What is MDA/DA based on?

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Instrument Rating

For every approach chart, what do MDA/DA based on?

Someone told me there were based on the obstrucles. But I'm not sure about it.

Airport design? Terrain? or another considerations?

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  1. Gary Moore on Aug 03, 2010

    Well that’s a great question. Certainly obstacles play a role – but it’s more complicated than just that – things like nav-aid reception, terrain, traffic flows – all play a part. All the specifics are spelled out in a set of documents called TERP – you can check them out here – http://bit.ly/bCa45Q

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