Powered Descent Initiation

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

Powered Descent Initiation (PDI) is a term used during the Apollo program Moon landing missions to describe the maneuver of the Apollo Lunar Module as it descended from lunar orbit to landing. [1]

"Eagle was GO to ignite its descent engine, and Armstrong and Aldrin locked their eyes to the glowing numbers displayed before them. They were almost at an invisible junction of height, speed, range, and time when everything would join together for commitment. When the instruments told them that they were 192 miles from their projected landing site, and were precisely 50,174 radar~measured feet above the long shadows of the moon, they would unleash decelerating thrust and begin slowing their speed for the touchdown.....this was it. PDI. Powered Descent Initiate."[2]

References

  1. ^ A Running Start - Apollo 17 up to Powered Descent Initiation
  2. ^ Moon Shot The Inside Story of America's Race to the Moon, Alan Shepard/Deke Slayton Page 17 First Edition
Retrieved from "https://en.wikipedia.org/w/index.php?title=Powered_Descent_Initiation&oldid=763681720"
This content was retrieved from Wikipedia : http://en.wikipedia.org/wiki/Powered_Descent_Initiation
This page is based on the copyrighted Wikipedia article "Powered Descent Initiation"; it is used under the Creative Commons Attribution-ShareAlike 3.0 Unported License (CC-BY-SA). You may redistribute it, verbatim or modified, providing that you comply with the terms of the CC-BY-SA