Apollo 10 launch
Using a test version of the lunar module (LM), the crew would try many of the maneuvers that Apollo 11 would perform, short of actually landing on the Moon.The spacecraft lifted off from Florida’s Kennedy Space Center on May 18, 1969. When re-docking was completed, Stafford and Cernan moved back into the command module and the astronauts jettisoned the LM into its own orbit around the Sun.On the final day at the Moon, after further surveying and navigation-related tasks, the crew fired the rockets that would propel them out of lunar orbit and send them home. ][The inboard J-2 engine is shut down early to minimise its tendency to induce low frequency pogo oscillations. ][The S-IVB is now capable of placing itself plus the CSM and LM into a safe low earth orbit if problems are encountered with the S-II that require immediate staging. They might have wanted to, but it was impossible for that lunar module to land. The respective tanks are purged of contaminants with nitrogen gas, then precooled. The constraint at the end of the launch window is that beyond 96°, the vehicle's orbital path would go beyond the network of ground stations scattered across the globe. ][Partial overcast obscured some of the ascent, with lift-off occuring at 12:49:00 p.m. EDT][The transcript begins at the 9-hour point in the countdown after a hold. The second to last piece of hardware for the Artemis I test flight around the Moon has arrived at Kennedy Space Center. The water-seeking mobile VIPER robot will help pave the way for astronaut missions to the lunar surface beginning in 2024. The BPC protects the spacecraft from the heat generated by the friction of ascent, and from the exhaust of the Launch Escape Motor should the tower be used for an abort.] Statements on the progress of the countdown are made by the Public Affairs Officers (PAO) Chuck Hollinshead and Jack King, the 'Voice of Apollo'. To achieve a 72° azimuth, the gimbal-mounted guidance platform within the Instrument Unit is rotated to point to this azimuth and it is held there by a servo system that uses a theodolite located 210 metres directly south of the pad. It was coming between the window and the BPC and it was aerodynamic heating. Steps were taken to ensure that the range safety explosives could not be detonated and that the vehicle's engines could not be accidentally ignited, the launch teams brought the count all the way to the point where, in a real launch, the engines of the first stage would be ignited. The built-in 1-hour hold at T minus 3 hours 30 minutes precluded a launch delay. ][The backup CMP Donn Eisele and astronaut Joe Engle went onboard the CM early in the countdown to verify the lift-off configuration, checking each switch, circuit breaker, knob and talkback indicator to ensure they were all correctly set prior to the flight crews arrival and ingress. Apollo 10 was a full “dry run” for the Apollo 11 mission, in which all operations except the actual lunar landing were performed. The IU and the platform housing include small windows to allow the light from this theodolite to reach the sensing apparatus within. On completion of the CDDT, the huge quantities of super-cold liquid hydrogen (LH[The terminal countdown was commenced at 01:00:00 GMT on 17 May 1969 and proceeded with no unscheduled holds. ][The Public Affairs Officer commentary has now transferred to Houston.
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