Finding aid (PDF)
On 5 May 1961, Commander Alan B. Shepard, Jr. became the first American to go into space as he completed a flight reaching 116 miles high and 302 miles downrange from Cape Canaveral, Florida. The formal countdown for Mercury 3 began at 0830 (all times in Eastern Standard Time) on 4 May 1961. It was split into two parts, as experience showed it was preferable to run the countdown in two shorter segments allowing the launch crew some rest in between. All operations proceeded normally and were completed ahead of schedule. A build-in hold of approximately 15 hours was called at T-6 hours 30 minutes. During this time the various pyrotechnics were installed in the spacecraft and the hydrogen peroxide system was serviced.
The countdown resumed at 2330 on 4 May. A built-in hold of 1 hour took place at T-2 hours 20 minutes during which final preparation of the spacecraft was conducted. Shepard was transported to the Pad and the countdown continued, except for some minor holds, until T-15 minutes. At this time it was determined that photographic coverage of the launch and flight could not be obtained because of low clouds near the launch area. Weather forecasters predicted that visibility would improve rapidly within 20 to 45 minutes. During this time, one of the 400hz power inverters connected to the launch vehicle developed regulation problems. The count was reset to T-35 minutes and holding, and the clock restarted 86 minutes later following replacement of the inverter.
It was again necessary to hold the count at T-15 minutes for a final check of the real-time trajectory computer. The countdown then resumed and proceeded until liftoff at 0934. The capsule, Freedom 7, was recovered by an HUS-1 helicopter of HMR(L)-262 following splashdown in the Atlantic. The helicopter transported Shepard and the capsule to the carrier Lake Champlain (CVS-39).
NASA Project Mercury Mission MR-3
Grossnick, Roy A. United States Naval Aviation 1910-1995. Washington: Naval Historical Center, 1997.
Scope and Content Note
This collection contains miscellaneous records relating to the 5 May 1961 flight of Mercury 3 with astronaut Alan Shepard. The collection is arranged in four series.
Series I, Logs, consists mostly of aircraft navigation and radio logs. A group of logs recording the capsule recovery procedures is also present. They are arranged alphabetically by type.
Series II, Communications, holds correspondence regarding Shepard?s flight and the Mercury project as a whole. Also included is a group of Navy and Joint Chiefs of Staff messages. This message traffic discusses the Soviet space program, coordinates events for the Mercury 3 launch, and congratulates Shepard on his achievement. Material in this series is arranged chronologically.
In Series III are several miscellaneous items, including three photographs showing Captain Ralph Weymouth and Rear Admiral George Koch on USS Lake Champlain, helicopters lifting off from USS Valley Forge, and Shepard with the Mercury capsule on Lake Champlain. Two issues of Life magazine with stories about Shepard and the Mercury flight are also found in this series.
The final series consists of maps and charts used during the flight of Mercury 3. These large oversize charts include a World Aeronautical Chart, five Mercury Test Flight Charts, two Air/Surface LORAN Navigation Charts, a U.S. Air Force Jet Navigation Chart, and a Continental Entry Chart. Several of these have tracking data and other information recorded in pencil.
This collection should be cited as Records Relating to Mercury 3, Archives Branch, Naval History and Heritage Command, Washington, D.C.
0.5 cubic feet
3 July 2003