Bell flight 11. Glide flight and stall check. At Muroc Dry Lake, California. References: 49 , 97 .

Bell flight 5. Pilot noted low-frequency elevator buzz at mach 0.93, did not proceed above this speed, pending buzz investigation. References: 49 , 97 .

Council of Soviet Ministers (SM) Decree 'On approval of work on the R-5M missile and on establishment of OKB-586 at Dnepropetrovsk Plant No. 586' was issued. Sadoviy and Kozlov were named to lead the project. Based substantially on the R-5, it used the 8U25 launch portable launch stand. References: 474 .

Gas composition research. Launched at 0200 local time. Reached 5 km.

Escape-motor canting-angle tests were completed at Wallops Island. Tests were conducted in 5 degree increments between 10 degrees to 30 degrees, and visually it appeared stability was better at the larger angle. References: 483 .

North American awarded a $9.5 million letter contract to the Link Division of General Precision, Inc., for the development and installation of two spacecraft simulators, one at MSC and the other at the Launch Operations Center. Except for weightlessness, the trainers would simulate the entire lunar mission, including sound and lighting effects. References: 16 .

Suborbital. References: 5 .

The upper stages fell apart on re-entry into the atmosphere.. References: 5 , 64 , 65 .

Leonov announces that cosmonauts are in training for lunar missions. References: 72 .

Space craft engaged in investigation of spaceflight techniques and technology (US Cat A). References: 1 , 2 , 5 , 6 .

Radar monitoring. References: 1 , 2 , 5 , 6 , 172 .

KH-9 type satellite. Space craft engaged in investigation of spaceflight techniques and technology (US Cat A). References: 1 , 2 , 5 , 6 .

Ferry flight, shuttle carrier aircraft/Enterprise (OV-101) from MSFC to KSC (1 hour, 52 minutes) References: 15 .

Manned two crew. Flight under the Intercosmos programme of an international team consisting of N N Rukavishnikov (USSR) and G I Ivanov (Bulgaria). Unsuccessful mission. Failed to rendezvous with Salyut 6. Recovered April 12, 1979 16:35 GMT. References: 1 , 2 , 6 , 32 , 33 .

Also carried transponders for domestic communications. Operational multipurpose satellite for telecommunications, meteorological, imaging and data relay, radio and television programme distribution and direct television broadcasting for community reception. Geosynchronous orbit longitude 74 E. A/AC.105/INF.391 was reissued as ST/SG/SER.E/79. Also registered by the United States as 1982-31A in ST/SG/SER.E/67, with category C and orbital parameters 1416.7 min, 35032 x 35783 km x 0.5 deg. References: 1 , 2 , 5 , 6 .

High resolution photo reconnaissance; returned film in two small SpK capsules during the mission and with the main capsule at completion of the mission. References: 1 , 2 , 6 , 179 .

Global Positioning System. Spacecraft engaged in research and exploration of the upper atmosphere or outer space (US Cat B). References: 1 , 2 , 5 , 6 .