Discovery (STS-51-D) launched 1985

STS-51-D crew

Front row (L-R): Karol Bobko, Donald Williams, Rhea Seddon, Jeffrey Hoffman

Last row (L-R): David Griggs, Charles Walker, Edwin Garn

Mission patch

Space Shuttle Discovery (STS-51-D), launched April 12, 1985, was the fourth flight of Discovery.  Its crew consisted of Commander Karol Bobko, Pilot Donald Williams, Rhea Seddon, David Griggs, Jeffrey Hoffman, Charles Walker, and Senator Edwin Garn of Utah.

Hoffman and Griggs conducted an EVA on April 16 for just over 3 hours.  Griggs also performed tricks with a yo-yo to see how "Toys in Space" reacted to microgravity.  He successfully comppleted the flying saucer and around-the-moon, but the sleeper trick did not work without normal gravity.

The crew returned to Earth April 19 and a tire blew out upon landing, causing extensive damage to the brakes.