You Got a Bunch of Guys About to Turn Blue Were Breathing Again Thanks a Lot
Apollo Expeditions to the Moon
CHAPTER 11.4
A YELLOW CAUTION Lite
At vi thousand feet higher up the lunar surface a yellow caution low-cal came on and we encountered one of the few potentially serious problems in the entire flight, a trouble which might accept caused us to abort, had it not been for a human being on the ground who really knew his task.COLLINS: At five minutes into the burn, when I am nearly direct overhead, Hawkeye voices its kickoff concern. "Program Alarm," barks Neil, "It's a 1202." What the hell is that? I don't take the alarm numbers memorized for my own computer, much less for the LM's. I jerk out my ain checklist and get-go thumbing through it, merely earlier I can notice 1202, Houston says, "Roger, we're Keep that alarm." No problem, in other words. My checklist says 1202 is an "executive overflow," pregnant simply that the computer has been called upon to do too many things at once and is forced to postpone some of them. A piddling farther forth, at just three thousand feet above the surface, the reckoner flashes 1201, another overflow status, and once more the ground is superquick to respond with reassurances.
| The unknown that is before long to be known: This picture shows the Apollo 11 landing site one orbit before descent was begun. Tranquility Base of operations is near the shadow line, a little to the right of center. The big jagged shape to the left is not a shadow but an out-of-focus LM thruster. |
ALDRIN: Back in Houston, not to mention on board the Eagle, hearts shot upward into throats while nosotros waited to larn what would happen. We had received two of the caution lights when Steve Bales the flight controller responsible for LM computer activity, told us to go on, through Charlie Knuckles, the sheathing communicator. Nosotros received three or iv more warnings but kept on going. When Mike, Neil, and I were presented with Medals of Liberty past President Nixon, Steve also received ane. He certainly deserved it, because without him we might not have landed.
ARMSTRONG: In the final phases of the descent after a number of program alarms, we looked at the landing area and found a very large crater. This is the area we decided we would non go into; nosotros extended the range downrange. The exhaust dust was kicked upwards by the engine and this acquired some concern in that it degraded our power to decide not only our altitude in the final phases just also our translational velocities over the footing. It's quite important not to stub your toe during the final phases of touchdown.
| "You cats accept it like shooting fish in a barrel," Collins radioed in farewell as the lunar module separated - for its historic descent to the surface of the Moon. The 3 probes extending beneath the footpads were to plough on a contact light reporting when the LM was inside a few feet of the surface. On the nearest landing leg note the ladder giving access to the surface from the motel at the top. The exhaust bong of the large descent engine can be seen in the center. It made two burns, finally settling the LM gently on the surface with just seconds of fuel remaining. |
From the infinite-to-basis tapes:
Eagle: 540 feet, down at xxx [feet per 2d] . . . down at 15 . . . 400 feet down at 9 . . . frontward . . . 350 feet, down at iv . . . 300 feet, downwards 3 1/2 . . . 47 forrard . . . 1 1/2 down . . . 13 forward . . . 11 forward? coming downwardly nicely . . . 200 feet, 4 1/2 downward . . . five 1/2 down . . . 5 percentage . . . 75 feet . . . half-dozen forward . . . lights on . . . down ii 1/2 . . . 40 feet? down 2 1/2, boot up some dust . . . 30 feet, 2 i/2 downward . . . faint shadow . . . 4 forrard . . . 4 forrard . . . drifting to right a little . . . O.M. . . .
HOUSTON: 30 seconds [fuel remaining].
EAGLE: Contact calorie-free! O.K., engine end . . . descent engine command override off . . .
HOUSTON: We copy yous down, Eagle.
Hawkeye: Houston, Tranquility Base here. The Eagle has landed!
HOUSTON: Roger, Tranquility. We copy you on the basis. You lot've got a bunch of guys about to turn blue. We're breathing over again. Thanks a lot.
TRANQUILITY: Cheers . . . That may have seemed like a very long concluding phase. The auto targeting was taking us right into a football-field-sized crater, with a big number of big boulders and rocks for about 1 or 2 crater-diameters around it, and information technology required flying manually over the rock field to find a reasonably good area.
HOUSTON: Roger, we copy. Information technology was beautiful from here, Tranquility. Over.
TRANQUILITY: We'll get to the details of what'southward around here, but it looks like a collection of just well-nigh every multifariousness of shape, angularity, granularity, about every variety of stone y'all could find.
HOUSTON: Roger, Serenity. Be brash in that location's lots of grinning faces in this room, and all over the earth.
TRANQUILITY: There are ii of them up here.
COLUMBIA: And don't forget one in the control module.
ARMSTRONG: Once [we] settled on the surface, the dust settled immediately and we had an first-class view of the area surrounding the LM. We saw a crater surface, pockmarked with craters upwards to 15, xx, 30 feet, and many smaller craters downward to a bore of one pes and, of class, the surface was very fine- grained. There were a surprising number of rocks of all sizes.
 | Leaving the 9th footstep of the ladder, Aldrin jumps downwardly to the Moon. Earlier on the "porch" he had radioed, "Now I desire to partially close the hatch, making sure not to lock it on my manner out." Armstrong'south dry response was: "A good thought." On Globe his weight, including the spacesuit and mechanism-filled portable life-back up system, would have totaled 360 lb; just here the gross came only to a bouncy 60 lb. The descent-engine exhaust bell (extreme right) came to balance about a human foot to a higher place the surface. |
A number of experts had, prior to the flight, predicted that a good bit of difficulty might be encountered past people due to the variety of strange atmospheric and gravitational characteristics. This didn't prove to be the instance and after landing we felt very comfortable in the lunar gravity. It was, in fact, in our view preferable both to weightlessness and to the World's gravity.
When we really descended the ladder it was found to be very much like the lunar-gravity simulations we had performed here on World. No difficulty was encountered in descending the ladder. The last stride was about 3 1/two anxiety from the surface, and we were somewhat concerned that we might accept difficulty in reentering the LM at the end of our activity menstruation. So nosotros practiced that before bringing the camera down.
 | The dusty surface took footprints like clammy sand. Although superficicilly soft, it proved remarkably resistant to penetration by coring tubes, which by and large hung upward after being driven a few inches. |
ALDRIN: We opened the hatch and Neil, with me as his navigator, began backing out of the tiny opening. It seemed like a modest eternity before I heard Neil say, "That's one small stride for human being . . . one behemothic leap for mankind." In less than fifteen minutes I was bankroll awkwardly out of the hatch and onto the surface to join Neil, who, in the tradition of all tourists, had his camera fix to photograph my arrival.
 | The flag of Tranquillity Base was not a symbol of territorial claim so much every bit identification of the nation that had carried out the showtime manned landing. Aldrin's forward-leaning opinion hither was the normal resting position of an Astronaut wearing the large life-support pack. Notation eroded, one-half-buried rock in right foreground. |
I felt buoyant and total of goose pimples when I stepped downwards on the surface. I immediately looked down at my anxiety and became intrigued with the peculiar properties of the lunar dust. If ane kicks sand on a beach, it scatters in numerous directions with some grains traveling further than others. On the Moon the grit travels exactly and precisely every bit it goes in various directions, and every grain of information technology lands virtually the aforementioned distance away.
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Source: https://www.history.nasa.gov/SP-350/ch-11-4.html
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