Mariner 4’s primary objective was to conduct closeup scientific observations of Mars and to transmit these observations to Earth. Additional goals included performing field and particle measurements in interplanetary space, and providing experience and knowledge of engineering capabilities for interplanetary flights of long duration…
In a healthy spacecraft, the CO2 meter should climb no higher than 2 or 3 millimeters of mercury. When it rose above 7, the crew was instructed to change their lithium hydroxide canisters. If it was allowed to rise above 15, the first signs of CO2 poisoning would set in.
In the satellite room of the carrier Iwo Jima, the communications man sat back and removed his headset. He knew, that Apollo 13 was in fact coming their way.
Lovell’s disappointment with Kranz’s decision to not run another star check was quickly becoming academic since the time to conduct it was running out anyway.
“They’re all coming out,” Swigert said, straining for a glimpse through Lovell’s window.
“You said it,” Lovell said. “There’s Nunki, there’s Antares. We may have enough here for that confidence check.”
According to the profiles Bill Peters and his electrical specialists calculated, it was possible to power the LEM with just 12 amps. Under normal conditions it needed about 55 amps of current to run.
“The first burn, Griffin explained, would be a long one. Pushing the descent throttle all the way to the full position, Lovell would leave it there for more than six minutes before shutting the engine down.
This maneuver, which for simplicity’s sake Griffin called the superfast burn, would put the crew down in the Atlantic Ocean on Thursday morning, just thirty-six hours from the scheduled PC+2 time later that night.”
Electricity was in short supply. A fully functioning, up-and running LEM required about 55 amps of current to operate.