AF flight 46. Partial engine malfunction, faulty engine ignition plug.

USAF approved Western Development Division proposals to inaugurate a second ICBM airframe, which became the Titan ICBM (SM-68).

Members of STG presented the proposed advanced manned spacecraft program to Wernher von Braun and 25 of his staff at Marshall Space Flight Center. During the ensuing discussion, the merits of a completely automatic circumlunar mission were compared with those of a manually operated mission. Further discussions were scheduled.

Manned Mercury-Redstone (MR-3) launch postponed because of rain squalls in the recovery area.

Seliger launched his 12.8 m long, three-stage rocket at an attempt to reach an altitude of 150 km. The effects of his contracts with the military were apparent. The 74th Panzer batallion at Altenwalde provided security, field communications, two jeeps as command posts, and a helicopter to search for the missile after the flight. The first launch of the day was that of a single-stage rocket to 50 km altitude. The mission was to measure high altitude winds and test the new parachute recovery system. The payload was successfully recovered in Wernerwald. Preparation of the three stage rocket took three hours, leading up to the planned 16:00 launch time. The 6 m long rocket lifted off at 16:03 but only reached an altitude of 120 km.

Maximum Speed - 5612 kph. Maximum Altitude - 63820 m. Carried earth background radiation instrument in support of Midas reconnsat development.

Maximum Speed - 661 kph. Maximum Altitude - 13720 m. Flight Time - 231 sec.

The Air Force Manned Orbiting Laboratory Systems Program Office requested that MSC present a briefing to selected office and contractor personnel on NASA's progress in safety studies and tests associated with fire hazards aboard manned space vehicles. Information was requested for the MOL program to help formulate studies and activities that would not duplicate MSC efforts. The briefing was given at MSC May 10.

Launched from Arecibo, Vega Baja, Puerto Rico - Latitude: 18.50 N - Longitude: 66.73 W.

KH-4A. Imagery of both pan camera records is soft and lacks crispness and edge sharpness.

Radar monitoring.

The N1 program was cancelled before the next test flight. Mishin was removed as head of NPO Energia. Kozlov is first asked to replace him, but he prefers to stay in Samara. Glushko is appointed as the second choice. Two fully assembled (serial numbers 8L and 9L), and four partially assembled rockets were available at time of cancellation. These would have been the first to use the new modernized series NK-33/NK-39 engines. 8L was planned for launch in the fourth quarter of 1974. Confidence was high that, based on the massive telemetry received on the 7L flight, that all problems would have been rectified. A total of 3.6 billion rubles was spent on the N1-L3 program, of which 2.4 billion rubles went into N1 development. Those on the project felt that they were within months of finally providing the Soviet Union with a heavy-lift booster. Instead the work was discarded, and Glushko began design of the RLA/Vulkan with entirely new configuration and engines.

Development of the Block Sr for the N1M cancelled; work on the smaller Block R LH2/LOX stage was resumed. This stage was eventually to have been used on the Buran / Vulkan launch vehicles.

Under US pressure Italy had signed the Nuclear Non-proliferation Treaty on 2 May 1975. Work on nuclear-tipped ballistic missiles ended.

Plane 2. Ascending node 199.4 degrees. Not in service.

Plane 2. Ascending node 199.3 degrees. Not in service.

Flight Time: 2.3 hours Pilot: Melvill Copilot: Rick Aldrich. Objectives: Engine performance at altitude. New pilot masks and ECS airflow routing. Regulated bleed air control of the aft cabin temperature (to test the capability to heat SpaceShipOne's nitrous oxidizer. Appraisal of new traffic alert system. Results: Engines showed much improved performance up to 50,000 feet. ECS changes confirmed to assure clear windows for landing. Successful bleed air heating test: good control and sufficient energy for SS1 propellant heating.

Final flight of Skylark suborbital rocket. MASER 10 carried two biology experiments and three fluid physics experiments. The payload spent six minutes in microgravity and worked perfectly during the flight.

Suborbital microgravity mission. Kaiser-Threde developed a new payload service system for MAXUS 7, providing 2 independent TV-links with 2 high power HF transmitters and GPS. The recovery system was a BAL ORSA system, modified by Kaiser-Threde, including parachute from DLR.