Silently and carefully, Armstrong raised his left boot over the lip of the footpad and lowered it to the dust. Immediately he tested his weight, bouncing in the gentle gravity, and when he felt firm ground, he was still, one foot on the last vestige of earthly things, the other on the moon. Then he spoke:
“That’s one small step for man, one giant leap for mankind.”
With the Hycon camera down, Roosa would have to step in and use a Hasselblad with a 500 mm lens, to take detailed photos of the Apollo 16 potential landing site. If Roosa did nothing else, he had to return to earth with pictures of Descartes that would be good enough to plan a lunar landing.
A small plutonium source was used to power the Radioisotope Thermoelectric Generator (RTG) that would provide electric power for the ALSEP experiments. Ed Mitchell performed the delicate maneuver of inserting the fuel capsule into the RTG.
Suddenly the caution lights went out and the radar signals began to transmit. Within seconds the astronauts could see that its data was good. Seconds later in mission control, a jubilant Will Presley shouted, “Flight, we got radar lockup!”
While checking the lander’s guidance software, during a final practice run for the landing, engineers in mission control detected that the computer was receiving an errant signal from the abort pushbutton.