• the laser-based Kontakt rendezvous and docking system had to either be backed up with redundancy throughout, or an independent back-up system had to be developed
• the L3 had to be designed with an internal transfer compartment, as was being done for the DOS/7K-T space station system
• each stage of the N1 had to undergo flammability tests
• the mission scenario had to be reformulated to provide support by more than one cosmonaut on the moon at a time, and use of automated landers and rovers from Babakin at Lavochkin
• landings of the capsule in the equatorial oceans of the world had to be eliminated. The capsules had to land on the territory of the USSR

At 05:20 the State Commission and their guests arrive at the Area 95 observation point to view the launch. The booster takes off on schedule at 06:40 in light rain and 60 km/hr wind. The tracking station reports good orbital insertion, separation from the third stage, and antennae and solar panel deployment. But the cover of the scientific equipment bay does not separate. This will mean that many experiments cannot be accomplished. It is decided to launch the crew to the station anyway, since the station is otherwise functioning normally. The cosmonauts go to the baths in the evening. Additional Details: Salyut 1. References: 2, 6, 67, 274, 376.

PVO radars pick up the capsule as it soars over the Caspian Sea, and a Mi-4 helicopter sights the parachute even before it thumps down, upright, on the steppes. During the landing, the Soyuz air supply became toxic, and Rukavishnikov was overcome and became unconscious. Nevertheless the crew safely landed at 23:40 GMT, 120 km NW of Karaganda. At the cosmodrome, Chertok is assigned to head a special commission to find the cause of the docking failure and correct it before the next mission can be launched. The VVS aircraft leaves at 07:00 for Moscow. Mishin was to accompany the VPK on their aircraft back, but he is drunk and has to go separately at 15:00. The Soyuz 10 crew reaches Chkalovsky Air Base at 14:00 on 26 April and proceed to Star City for further debriefings. Film and photos indicated that the docking system on the Salyut was not damaged, setting the stage for the Soyuz 11 mission. References: 367, 376.

President Nixon had nominated Fletcher for the position on March 1, and the Senate had confirmed the nomination on March 11. George M. Low, NASA Deputy Administrator, had been Acting Administrator since the resignation of Paine on September 15, 1970. References: 16.