Douglas Aircraft Company, Inc., completed an engineering study on the feasibility of designing a man-carrying satellite. The study showed that if a vehicle could be accelerated to a speed of 27 360 km per hr and aimed properly it would revolve on a circular orbit above the Earth's atmosphere as a new satellite. Such a vehicle would make a complete circuit of the Earth approximately every hour and a half. Additional Details: here....

Cosmic radiation; upper-air pressures and temperatures research. Ship launch. Launched at 1608 local time. Reached 169 km. NRL Viking No. 4 research rocket fired from the USS Norton Sound, near Jarvis Island in the Pacific (0.19 N 161.42 W), at the intersection of the geographic and geomagnetic equators. It set an altitude record for an American single-stage rocket and was the first firing of the Viking from shipboard.

During a Bell captive-carry flight test over Lake Ontario, X-2 number 46-675 suddenly exploded, killing Bell test pilot Jean Ziegler and observer Frank Wolko. The EB-50A mothership managed to land, although damaged. Only after several other mysterious X-plane losses was the cause found to be a rocket engine gasket made of Ulmer leather, which decomposed and became explosively unstable after sustained exposure to liquid oxygen.

General Operational Requirement 12 for a piloted, high-altitude, reconnaissance weapon system available by 1959. Air Force headquarters announced General Operational Requirement 12 for a piloted, high-altitude, reconnaissance weapon system available by 1959.

James E. Webb, NASA's new Administrator, reviewed the Gemini program. Project Gemini cost estimates at this point ($744.3 million) had increased substantially over the original estimate of $250 million. Estimated spacecraft cost had risen from $240.5 to $391.6 million; Titan II cost, from $113.0 to $161.8 million; Atlas-Agena, from $88.0 to $106.3 million; and supporting development (including the paraglider program), from $29.0 to $36.8 million. Estimated operations costs had declined from $59.0 to $47.8 million.

While Kamanin is away arranging screening of Voskhod candidates, Korolev meets with the VVS General Staff. He tells them he wants to have four Voskhods completed by the anniversary of the October Resolution for the first spacewalk. He dreams of a manned lunar flyby by either docking Soyuz A-B-V modules in orbit, or in a single N1 launch (no metal has even yet been cut for the N1 at Kuibyshev). In order to further develop EVA techniques he wants to convert a further five Vostoks into the Voskhod configuration. Meanwhile Kamanin agrees to a compression of the medical screening schedule from 20-25 days to 15-17 days. The physicians will reduce it no further than this.

Developmental testing began on a new landing device for the CM, one using rockets (mounted on the heatshield) that would be ignited immediately before impact. The current method for ensuring the integrity of the spacecraft during a landing in rough water involved strengthening of the aft structure. The new concept, should it prove practicable, would offer a twofold advantage: first, it would lighten the CM considerably; second, it would provide an improved emergency landing capability.

Chief Designer A A Golubev from OKB-154 Voronezh discusses the failure of his engines on the third stage of the Molniya launch on 27 March. He points out that the third stage has operated successfully in 500 stand trials and over 100 flights. It is true there have been seven instances of high-frequency oscillations in test stand runs of the engines, going back to the time of Tereshkova's flight, but these are felt to be due to the test stand propellant feed set-up and would not occur in flight engines. Despite no definite cause having been found for the third stage failure on 27 March, he guarantees his engines ready for flight. Other commission members question his optimism, but finally his guarantee is accepted, dependent on a thorough quality assurance review and certification by military officials responsible for control of the production processes at the factory. Voronin certifies the ECS system for an 18 day flight. Tsybin certifies the readiness of the spacecraft, and Shabarov the readiness of the booster at the launch centre. The absence of Korolev's presence is sorely felt, especially in handling the opposition of Smirnov and Pashkov to the flight. Nevertheless, the order is given for final preparations to proceed, with launch set for 22-28 May. However the confidence of the commission members in standing up to Smirnov is tenuous, and it is clear that any delay into June or July will kill the flight.

Mishin guarantees to Smirnov that Soyuz 11 will be able to dock to Salyut 1. He also promises thirty-day missions for both Soyuz 11 and Soyuz 12. But there is a problem with this last promise -- Soyuz 12 won't launch until 15-18 July, which will be after the guaranteed life of the Salyut 1 station. Kamanin protests the decision. Smirnov points out that they must fulfil the resolutions of the Communist Party without question. But he reassures Kamanin that they will take everything one step at a time, keeping the safety of the crew in mind. Kutakhov also does not support the decision, but orders must be followed.

Continued operation of the long-range telephone and telegraph radio-communication system within the Soviet Union and transmission of USSR central television programmes to stations in the Orbita and participating international networks (international cooperation scheme).

A Titan IIIC launched a pair of DSCS II satellites into orbit from Cape Canaveral, Florida. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Positioned in geosynchronous orbit over the Atlantic Ocean at 12 deg W in 1977-1979; over the Atlantic Ocean 5 deg W in 1979; over the Pacific Ocean 140 deg E in 1980-1981 As of 28 August 2001 located at 152.07 deg W drifting at 12.959 deg W per day. As of 2007 Mar 10 located at 47.37W drifting at 12.959W degrees per day.

A Titan IIIC launched a pair of DSCS II satellites into orbit from Cape Canaveral, Florida. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Positioned in geosynchronous orbit over the Pacific Ocean at 175 deg E in 1977-1979 over the Atlantic Ocean 12 deg W in 1979-80 over the Pacific Ocean 175 deg E in 1980-1983 over the Pacific Ocean180 deg E in 1983-1986 over the Atlantic Ocean 1 deg W in 1986-1989 As of 3 September 2001 located at 143.55 deg W drifting at 17.451 deg W per day. As of 2007 Mar 9 located at 13.13E drifting at 17.445W degrees per day.

Stationed at 1.2 deg E. TV distribution services to Western Europe and the Canary Islands under franchise from the Grand Duchy of Luxembourg. Contracted and controlled by the private company formed in 1985 called Société Europíenne des Satellites (SES). This is the third in a series of 4 medium power satellites, and will act primarily as Astra 1A's backup. Spacecraft: HS-601 platform.3-axis unified ARC 22 N and one Marquardt 490 N bipropellant thrusters, Sun and Barnes Earth sensors and two 61 Nms 2-axis gimballed momentum bias wheels.1658 kg nitrogen tetroxide & MMH in four spheres. Spin-stabilised in transfer orbit. Twin solar wings of three 2.16 x 2.54 m panels carrying large area silicon cells on Kevlar substrate to satisfy 3.3 kW requirement. Eclipse protection provided by Nickel hydrogen batteries. Payload: 18 eclipse protected transponders, plus six spares with 63W TWTA 10.95-11.200 Ghz down Ku-band European beams in 250 Mhz band adjacent (below) to Astra 1A, 26 Mhz bandwidth, eirp 50 dBW min, orthogonal polarisation, operating in the FSS range Positioned in geosynchronous orbit at 19 deg E in 1993-1999 As of 5 September 2001 located at 19.21 deg E drifting at 0.002 deg W per day. As of 2007 Mar 11 located at 4.54E drifting at 0.051E degrees per day.

The cosmonauts entered open space via the air-lock of Kvant-2 at 10:44 GMT. The Germatizator experiment, the use of a special glue to seal off cracks on the outside surface of the complex, was executed according to plan. An inspection of a malfunctioning solar panel on Kvant-1showed that the steering cable to the rotor was burnt through due to a short-circuit and was beyond repair. The cosmonauts dismantled an experimental lightweight solar battery from the outer surface of the SO docking compartment. The last activity was the panorama-inspection, making images of the outside of the complex to enable specialist to analyse the effects of ageing of the material. The hatch was closed on what might have been the last spacewalk on Mir at 15:36 GMT.

Space station resupply spacecraft which docked with the Zvezda port of the International Space Station at 05:10 GMT on 15 May. It undocked on 19 September was conducted plasma depletion experiments before being deorbited over the Pacific at 19:01 GMT on 25 September..

Replaced ExPRESS Carrier Avionics (ExPCA), Installed Pressurized Mating Adapter-3 (PMA-3) Forward Shield, Installed Alpha Magnetic Spectrometer (AMS) MIL-1553 Terminator, Secured Multilayer Insulation (MLI) on Japanese Manipulator System, Relocated a Portable Foot Restrain to PMA-3