VDP vs PDP

bertengineer

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What is PDP. I am looking at questions from interviews and noticed this question. What is it?
 

Doc Holiday

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A PDP is a 'planned descent point', also referred to sometimes as a TTS (time to see)point. Several airlines use the concept and it is discussed in the book Mental Math for Pilots. A VDP is published on approach plates and take obstacle clearance into consideration, PDPs are 'calculated' by the pilot to simulate a VDP. This gives the pilot a good reference point to start a descent that will result in a 'normal landing' (reference 91.175).

I discussed this in an earlier thread, I'll see if I can go back and find it.

http://forums.flightinfo.com/showthread.php?t=58115

Hope this helps.
 
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80/20

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Doc Holiday’s answer is probably what they are looking (especially if used in connection with VDP).
It is also used in other aviation contexts: Power Distribution Panel (electrical system) and Pre-determined Point procedure used for fuel planning.
 
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