"Flight Day"
Juan Rivera - May 7, 1994 Telescope Operator Kuiper Staff and Mission Operations |
Off the ground at 0655Z (2055 Local Time). On board tonight we have a total of 13
people:
We're going to be held to 27,000 for a while by Air Traffic Control for some reason.
The flight crew will have to deal with that when the time comes.
0709Z We're passing through 26,000 feet already. I've shut off the flow of liquid
nitrogen which is used to pre-cool the telescope cavity. We do this for several reasons:
First of all the nitrogen boils off to a very cold dry gas which di splaces the moist air
in the cavity. We want the atmosphere in there to be free of any water vapor so it won't
fog up the optics and freeze there. Also, we cool the cavity with a huge portable air
conditioner and the liquid nitrogen so that it will be col d when we open the aperture
door and expose the optics to the ambient temperature at altitude. The mirror started
out... Oops... Got'a run!!!!
0749Z Hmm... We'll I spent the last 20 minutes or so attempting to repair a problem
with our oscillating secondary mirror. It has been very unreliable lately. Tonight when I
turned it on, it blew the main fuse in one of the power supplies that power it. All I
could really do in flight was to re-seat all the circuit boards and hope that the problem
was being caused by an intermittent connection. Last time this happened I was a hero
because I was able to save the mission. This time I was no t so lucky. We are now headed
back home and the mission has been aborted. We'll try to get hold of the day crew
technicians and see if they can spend some time tonight working on it. Most likely it
will be tomorrow before anything can be done. Last time t his happened I found two wires
that had been pulled out of the back of a connector on the rear of the chassis. The only
problem was that neither wire had anything to do with the problem! It was like trying to
find out why your car wouldn't start and findi ng a loose wire that went to the tail
lights. It's nice that I found it, but... Anyway, by the time the two broken wires were
fixed the problem had mysteriously gone away. It's very very difficult to fix a problem
that won't stay bad. We call those "inter mittents". Maybe this time the OSM will stay
bad. We call that "inoperative", or "inop" for short. Did you get all that? There will be
a test later in the week!
0809Z Time to bag this and secure all the loose equipment and prepare for landing.
More next time...
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