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Thread: DH v MDA
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Old 22nd August 2005 | 22:19
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FlightDetent

Only half a speed-brake
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Joined: Apr 2003
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From: Commuting not home
Oh I am so afraid he actually is. It is my understanding we could stick to MDA / DA / DH designation for the different types of approaches just because that's what they are. However the Bus displays the numbers on the FMA as MDA or DH only, and indeed the methodology is DH for radalt-controlled approaches and MDA for all the rest. To induce a little comm mayhem on the flightdeck I keep pronouncing the approach C/L item "MDA... ___ set [both]" as "decision altitude" for ILS CAT I just because MDA IS something completely different.

On the other hand I must say that in fact Airbus advocates that non-P.A. are flown under constant angle with VNAV help and MDA be treated as DA, i.e. no leveling to MAPt but immediate G/A. Although quite different from the Doc8168 concepts I struggled so hard to embrace, for straight-in approaches I believe it is a major step forward, safetywise.

Anyone cares to explain in little detail the Visual Descent Point concept I believe to be in the US?

FD.
(the un-real)
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