a17_v_bw_o_n (72-H-1466, 108-KSC-72P-512 eq, poss. 72-HC-876 eq)

“The Apollo 17 prime crew leaves the Manned Spacecraft Operations Building to enter the transfer van which will carry them to Complex 39’s Pad A, to participate in the Countdown Demonstration Test (CDDT). From right are Eugene A. Cernan, Commander; Ronald E. Evans, Command Module Pilot; and Harrison H. Schmitt, Lunar Module Pilot. Successful completion of the “dry” portion of the CDDT cleared the way for the launch of Project Apollo’s final Lunar landing mission at 9:53 p.m. EST on December 6. The launch will mark the first night mission for the Saturn V.”

And it gets better:

“Cernan, Evans and I suited up as we would on launch day and went out to Pad 39A to occupy America’s cabin for four hours as part of a full, pre-launch test of the Saturn V called Countdown Demonstration Test-Dry (CDDT-Dry). The “Dry” in this test referred to the fact that everything would be the same as on launch day except that the Saturn V fuel tanks would not be filled. CDDT use to be done “Wet”, that is, all the propellants and other fluids in the Saturn and spacecraft would flow into their respective tanks at the appropriate point in the launch countdown. After the 204-fire in January 1967 that killed Gus Grissom, Ed White, and Roger Chaffee, it was decided that the “Wet” demonstration during CDDT represented an unnecessary risk. The “Wet” part of the demonstration of launch preparedness took place without the crews present. The benefit to us for participating in the “Dry” test was two-fold: first, we would be able to see how the spacecraft systems and displays responded to various items covered by the test, and, second, we could be reminded of the few differences in appearance between the America and its simulator.”

At:

www.americasuncommonsense.com/1-apollo-17-diary-of-the-12...
Credit (outstanding): “AMERICA’S UNCOMMON SENSE: THE WEBSITE OF APOLLO 17 ASTRONAUT, SENATOR HARRISON H. SCHMITT”

www.hq.nasa.gov/alsj/a17/ap17-KSC-72P-512.jpg
Credit: J. L. Pickering/ALSJ

Taken on: March 11, 2022

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Sets appears in: • Breaking The Bonds & Firsts • Apollo 17

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