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While reading an article about Hang Gliding reserve parachutes, I came across the acronym "PDA". The article seemed to imply that this is a type of parachute and a further google search seems to confirm that.

What I haven't been able to find is a source explaining what this acronym stands for. Wikipedia disambiguation offers no help and neither do several aviation glossaries I a familiar with. Lastly, a search for "PDA" in this forum provides no results.

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    $\begingroup$ In the article they mention a "Pulled Down Apex", which is a particular type of parachute. Perhaps that's what they meant? $\endgroup$ Aug 17, 2018 at 15:23

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Pull-down apex. It's an additional attachment point in the center of the parachute. Putting force on it makes the parachute open up more like a half-donut, rather than a half-sphere. That provides more effective area for an annular parachute. That hole in the middle is needed for stability.

Example

Link: one product of this type with a bit of explanation.

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