11:22 EST, 14 November 1969
The count proceeded smoothly. We were ready to fly to the Moon…
Somehow, the litany of a launch has never been boring. That tightening up in the gut still happens, as it did that overcast November morning in 1969:
“10, 9, 8, we have ignition sequence start…6, 5, 4, 3, 2, 1, 0…all engines running, commit: liftoff!”[/font]
Inside the spacecraft, the crew talked to each other, their hearts pounding with excitement as the vehicle roared to life and shook, and the push of a strong elevator was suddenly felt on their backs:
(Only the bolded parts could actually be heard by Houston, and of course, the audience watching on their TVs. The rest was intercom inside the CM).
CONRAD: Liftoff, the clock’s running.
BEAN: 3 seconds.
CONRAD: I got a yaw program.
[font="Courier New"]PAO: Pete Conrad reports the yaw program is in!
BEAN: Six seconds,….there’s ten seconds.
GORDON: Cleared the tower.
CONRAD: Roger, clear the tower…I got a pitch and a roll program, and this baby is really going!
BEAN: Man, is it ever!
CAPCOM: Roger Pete.
GORDON: Twenty seconds.
CONRAD: That’s a lovely liftoff ! That’s not bad at all!
They’re all lovely…but this one didn’t last too long in the visual department:
By around twenty seconds, all you could see was a glow disappearing into the low overcast at KSC…
The litany on board continued:
GORDON: Everything’s looking great. The sky’s getting lighter.
CONRAD: Okay.
BEAN: Thirty seconds.
CONRAD: Looks good….
Roll’s complete.
BEAN: This thing moves, doesn’t it?
CAPCOM: Roger, Pete.
36 seconds into the flight. Roll program completed, and Apollo 12 was now moving into it’s proper flight path to orbit.
___________________________________________________________________________________
What the hell was that?!
Out of the small opening in the BPC, Pete Conrad saw out of the corner of his eye a flash of light.
Concurrent with that was a long burst of static in his (and everyone else’s) ears, and they felt the whole spacecraft shudder, the lights went out on board, the cockpit went dark, then came back up, and things happened very rapidly as a series of panel caution and warning lights illuminated in a Las Vegas like display of yellows and reds.
CONRAD: What the hell was that?
The Master Alarm claxon started banging away in the CM…this was serious stuff.
CONRAD: Huh?
GORDON: I lost a whole bunch of stuff…I don’t know…
CONRAD: Turn off the busses.
CAPCOM: Mark, one bravo.
On the ground, the folks watching trajectory and Saturn data were reporting the nominal abort mode calls to the spacecraft through the CAPCOM. They weren’t seeing what the spacecraft people were seeing on their screens. Mode 1 B was a call indicating that LES use for an abort would not require firing of the pitch control motors, and that the canards on the rocket would deploy to turn the spacecraft around to a blunt-end-forward position to allow proper parachute deployment. The call was normally made at around 40-45 seconds into the flight when the vehicle had passed through about 10,000 feet and its attitude no longer required any pitch adjustment by the LES motors.
CONRAD: Roger. We had a whole bunch of busses drop out.
BEAN: There’s nothing, it’s…nothing…
GORDON: A circuit…
Confusion reigns and heart rates start spiking rapidly. Very suddenly, these guys, on their way into orbit see their cabin lights go off and on, warning lights are illuminating on their instrument panel telling them everything’s basically screwed, they can’t see a thing out their windows as they’re covered by the BPC, and another flash happens at 52 seconds and the attitude indicator in front of Pete Conrad started spinning around, no longer indicating attitude control…
CONRAD: Where are we going?
BEAN: AC BUS 1 light, all the fuel cells..
CONRAD: I just lost the platform.
GORDON: All we’ve got is the GDC.
The GDC was the Gyro Display Coupler, a device which gave the crew attitude information in relation to an attitude they wanted to maintain, rather than attitude data relative to a fixed inertial reference (the “platform”).
CONRAD: OK, we’ve just lost the platform gang. I don’t know what happened here. Everything in the world dropped out.
CAPCOM: Roger.
BEAN: I can’t…there’s nothing I can tell is wrong Pete.
It was mighty weird aboard that spacecraft. It looked to Conrad, Gordon and Bean as if their spacecraft had shut off. Yet, Al Bean was looking at the spacecraft drawing power still, although at a lower voltage. Nothing was making sense and there wasn’t anything he could definitively say based on what he was seeing.
CONRAD: I got three fuel cell lights, and AC bus light, a fuel cell disconnect, AC BUS OVERLOAD 1 and 2, main bus A and B out!
BEAN: I got AC.
CONRAD: We got AC?
BEAN: Yes.
CONRAD: Maybe it’s just the indicator. What do you got on the main bus?
BEAN: Main bus is—the volt indicated is 24 volts.
CONRAD: Huh?
BEAN: 24 volts, which is low.
CONRAD: We’ve got a short on it of some kind…but I can’t believe the volts..
We were now at 1:30 into Apollo 12. This problem had been going on for an interminable minute. Pete Conrad had just described the largest set of caution and warning lights ever seen …even in the worst simulation! Basically, what Pete was describing was a Command Module that appeared to have just shut off, as best he could determine. Fuel cells had shut down, the electrical system was giving indication of overload, and the guidance platform indication had just been lost, and the 8-ball in front of his face (his attitude indicator) was now just spinning around wildly.
In Mission Control, Gerry Griffin, on his first shift as a new Flight Director, began thinking about aborting the mission (not exactly what a first time FD wants to contemplate). He called his EECOM (the controller responsible for electrical systems), 24 year old John Aaron, and asked him what he was seeing.
There was no immediate response.
The problem was, Aaron wasn’t seeing anything on his screen. It was filled with a jumble of nonsensical numbers…and the rest of his panel was illuminated with warning lights. Anyone looking at spacecraft data was seeing the same nonsensical mumbo-jumbo. The funny thing was, the booster itself was still returning valid data that indicated that the launch vehicle was right on it’s predicted flight path and was performing well.
We had serious problems. The crew was aboard what appeared to be an essentially dead spacecraft which was being powered by re-entry batteries, and was flying along without any attitude reference being given to the crew…basically, flying blind.
But Aaron had seen this nonsense pattern before in a simulation long ago, and had noted it. He remembered what he discovered over a year earlier. His call to Griffin became legend in Mission Control”
“Flight, try S.C.E. to Aux.”
SCE was signal conditioning equipment…a small redundant power supply that would feed alternate power to critical instrumentation. But only John Aaron knew about it, and that it had worked before in a simulation with similar data return.
What followed was somewhat comical in retrospect…and went something like this:
FLIGHT: Say again? SCE to Aux?
…meaning, “What the hell is that?”
EECOM (slowly): S.C.E. to Auxiliary.
FLIGHT: Capcom, have them take SCE TO AUX.
CAPCOM: SCE to AUX?
FLIGHT: Have them take SCE to Auxiliary.
No one except Aaron knew what the heck this was, seriously. SCE was an obscure switch that few people were familiar with.
CAPCOM: Apollo 12, Houston, Try SCE to Auxiliary.
CONRAD: NCE to Auxiliary. What the hell is that?
CAPCOM: SCE, S-C-E to auxiliary.
Al Bean, as LMP, had trained for launch in the right seat. The instrumentation and controls on the right side of the instrument panel contained controls for the power management of the spacecraft—the fuel cells, electrical power, cryogenics, and communications. Al Bean intimately knew just about everything about those systems, and in simulations, he’d become adept at recognizing just about every possible malfunction one could see during ascent. He had no idea about this one (“I’d never seen so many lights in my life!”). But he knew where the SCE switch was, up over his head. Within the next 4 seconds, Al flipped it to Auxiliary.
CONRAD: Try the busses. Get the busses back on line.
BEAN: It looks….everything looks good.
CONRAD: SCE to AUX.
GORDON: The GDC is good.
And in mission control, the data suddenly came back on the screens, and Aaron and crew could see what was happening, and hopefully assess what was wrong.
EECOM: I’ve got valid data flight. It’s looking good.
The guidance data from the Instrument Unit aboard the Saturn was still coming in, and Apollo 12 was still flying right down the track of the predicted flight path. In Mission Control, the priority was getting the fuel cells re-started, if possible. There was little time to get them back on line, because the spacecraft was now running on the re-entry battery supply. We were at about 2 minutes into the flight at this point, and we had about two minutes to get those fuel cells on line or abort the mission.
We had a Saturn that was flying perfectly, a CM that was at least reporting data in critical areas now, but without power of its own. The back and forth between flight controllers and conversation inside a semi-disabled spacecraft continued…
CONRAD: Stand by for the …I’ve lost the event timer; I’ve lost the …
CAPCOM: One Charlie.
CONRAD: One…one Charlie.
1 C was another abort mode milestone, this one indicating that the CM RCS would have to be used to orient the spacecraft for proper parachute deployment, because the canards on the LES would no longer work in the thin air at their present altitude.
At 2 minutes six seconds CAPCOM called,
“12 Houston, Go for staging.”
CONRAD: Roger, GO for staging. We had some real big glitch gang!
GORDON: What do the busses read, Al?
BEAN: Stand by.
CONRAD: Center engine.
GORDON: OK.
CAPCOM: 12, Houston, try to reset your fuel cells now.
BEAN: Reset the fuel cells.
GORDON: Wait for staging.
CONRAD: Wait for staging , yes.
You didn’t want to be flipping switches during the train wreck that was about to occur…
GORDON: Hang on.
CONRAD: Hang on.
GORDON: 25…27……32…
CONRAD: You got a clock running over here?
BEAN: Yes…hang on.
GORDON: There’s 41, Hang on…there it is.
BEAN: That’s it.
CONRAD: That’s it…that’s it.
BEAN: Staging.
GORDON: Hang on!
CONRAD: OK, CDG is good. Got a good S-II gang!
CAPCOM: We copy Pete…you’re looking good.
BEAN: Cabin pressure’s OK.
GORDON: We’re OK.
CONRAD: OK, now we’ll straighten out our problems here. I don’t know what happened. I’m not sure we didn’t get hit by lightning.
Pete was right. Back on the ground at the cape, the following was observed, an event concurrent with the appearance of the glitch at 36 seconds…
The Saturn, trailing a column of flame and ionized gasses, tore through the rain clouds and had become the largest lightning rod in the world. The bolt discharged right through the Saturn V and trailed all the way down to the launch tower, over a mile below.
We would have to re-think this all weather flying thing in the future!