Fired from AMR at 2047 hours EST. All primary missions were essentially successful, although the impact was 69 nm short and 4.9 nm to the right of the 1,302 nm predicted impact point. This undershoot was due to thrust controller deviation which commanded the exceedingly high thrust level during the main power flight pre-selected flight path. Cut-off occurred at 144 seconds of flight. References: 439 .
Pigs were eliminated as Little Joe flight test subjects when studies disclosed that they could not survive long periods of time on their backs. However, McDonnell did use a pig, 'Gentle Bess,' to test the impact crushable support, and the test was successful. References: 483 .
The only US test of an operational ballistic missile with a live 600 kiloton warhead. A Polaris A2 missile was launched from the ballistic missile submarine Ethan Allen (SSBN-608) 2800 km east-northeast of Christmas Island. The re-entry vehicle reached the target zone 1890 km away and detonated at 3,300 m. The resulting mushroom cloud was observed by the submarines Carbonero (SS-337) and Medregal (SS-480), both stationed within 25 km of the predicted impact point.
A preliminary Statement of Work for a proposed lunar excursion module was completed, although the mission mode had not yet been selected. References: 16 .
The Apollo earth landing system (ELS) was tested in a drop of boilerplate (BP) 19 at El Centro, Calif. The drop removed constraints on the ELS for BP-22; also, it was a "prequalification" trial of the main parachutes before the start of the full qualification test program. References: 16 .
MSC Assistant Director for Flight Crew Operations Donald K. Slayton and several astronauts (notably Joseph P. Kerwin) voiced concern regarding the purposes and proposed work statement for the S-IVB spent-stage experiment support module. As well as pointing out the general lack of experiment planning and hardware, Slayton and Kerwin noted a member of operational and safety concerns surrounding purging the stage's hydrogen tank to create a habitable structure in space.
Lunar landing research vehicle (LLRV) No. 1 crashed at Ellington Air Force Base, Tex. The pilot, astronaut Neil A. Armstrong, ejected after losing control of the vehicle, landing by parachute with minor injury. Estimated altitude of the LLRV at the time of ejection was 60 meters. LLRV No. 1, which had been on a standard training mission, was a total loss - estimated at $1.5 million. LLRV No. 2 would not begin flight status until the accident investigation had been completed and the cause determined. Additional Details: Apollo lunar landing research vehicle No 1 crashed at Ellington Air Force Base. References: 16 .
1100 of 2500 cables required rework based on results of testing of the ground test model at Khrunichev.
Unmanned resupply vessel to Mir; last of original design Progress spacecraft. Conducted fifth and final test of Buran ejection seat during ascent to orbit. The K-36M.11F35 seat was installed in an 'experimental droppable compartment' installed in place of the Launch Escape Tower engine on top of the shroud. Docked with Mir on 7 May 1990 22:45:03 GMT. Undocked on 27 May 1990 07:08:58 GMT. Destroyed in reentry on 27 May 1990 12:27:30 GMT. Total free-flight time 2.31 days. Total docked time 19.35 days. References: 1 , 2 , 6 , 275 .