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Old 03-31-2008, 04:43 AM   #16
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Oh i forgot to add, i dont think there has been a fire on a space shuttle, only for challenger and columbia during the accident but thats not really a fire, shuttle like a abort tower its never been used by the US (the Russians used a abort tower once)
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Old 03-31-2008, 07:07 AM   #17
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Do you want to see the timeline for Day 17 of STS-123.
Wikipedia said as of March 31, 2008.

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March 26 (Flight day 17, landing)


Endeavour rolls out after touchdown.


Flight controllers gave a no-go on de-orbit for the first landing opportunity at 23:05 UTC (19:05 EDT), due to unfavorable weather conditions at the Shuttle Landing Facility at Kennedy Space Center.[28]
Weather conditions were acceptable for the second landing opportunity, planned for 00:39 UTC 27 March 2008 (20:39 EDT 26 March 2008). The landing occurred at the Shuttle Landing Facility, and was the sixteenth night landing of the Space Shuttle at KSC , 22nd Shuttle night landing overall. Coincidentally, this mission also began with a night launch.
The second landing opportunity was a complete success with main gear touchdown occurring at 20:39:08 EDT (00:39:08 UTC 27 March 2008), nose gear touchdown at 20:39:17 EDT (00:39:17 UTC 27 March 2008), and wheels stop at 20:40:41 EDT (00:40:41 UTC 27 March 2008), completing the STS-123 crew's 15-day, 18-hour, 11-minutes, and 3-seconds space voyage.
The exhaust produced by the Hydrazine Gas Generator APUs on either side of Endeavour's tail fin created concern among some observers that something was amiss, as it appeared more pronounced than usual in NASA's visual light cameras.[29] However this exhaust is normal and expected. The three Hydrazine Gas Generator APUs are activated 5 minutes before the deorbit burn and are running for 5 min. after wheels stop. The monopropellant hydrazine is changing phase due to a catalyst and reach 1,700F (927C).[30] The hydraulic power is needed for the shuttle's rudder/speed brake, elevons, body flap and landing gear during descent, and for the main engine nozzles' gimballing during ascent. Each of the Solid Rocket Boosters have two similar Hydrazine Gas Generators for their nozzle gimballing.
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Old 03-31-2008, 07:45 AM   #18
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It wasnt a fire, it was just gas.
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Old 03-31-2008, 08:34 AM   #19
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Quote:
Originally Posted by ryan View Post
 It wasnt a fire, it was just gas.
Yes. Exhaust gas. Hydrazine is the same stuff that gets often used for Satellite attitude control systems.
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Old 03-31-2008, 08:52 AM   #20
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Quote:
Originally Posted by ryan View Post
 So it wasnt a fire.
You repeat yourself.
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Old 03-31-2008, 09:02 AM   #21
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OK, it's exhaust gas.
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Old 03-31-2008, 09:18 AM   #22
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But that Hydrizan can be nasty stuff.
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Old 03-31-2008, 09:23 AM   #23
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Quote:
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 But that Hydrizan can be nasty stuff.
It's spely hydrazine, not hydrizan.
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Old 03-31-2008, 09:24 AM   #24
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Sorry.
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Old 03-31-2008, 09:44 AM   #25
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Hydrazine is toxic, but otherwise a fairly user-friendly rocket fuel. You only need a catalyst coating in the chamber, ignition happens automatically if the catalyst has the right temperature.

The Shuttle also has a proposed update to replace the APUs by something less toxic - but that will never come now.

EDIT: BTW, There was once a APU fire in one of the Shuttles. In STS-9, one of the first flights, two APUs failed "under-speed" shortly after landing.

What this means in reality:

Quote:
Six minutes and fifty seconds after the Orbiter landed, APU (auxiliary power unit) -1 shut down automatically because of a turbine under-speed condition. Four minutes and twenty-four seconds later, a detonation occurred in APU-1, simultaneous with an automatic shutdown of APU-2, also the result of a turbine under-speed condition. Fourteen minutes and forty-two seconds after APU-2 shutdown, a detonation occurred on APU-2. APU-3 ran normally until the crew shut down the unit approximately 12 minutes after landing.
http://www.jsc.nasa.gov/news/columbia/anomaly/STS9.pdf

The cause was hydrazine leaking as early as 17 minutes after starting the APUs for reentry.
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Old 03-31-2008, 10:09 AM   #26
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Quote:
Originally Posted by Urwumpe View Post
 Hydrazine is toxic, but otherwise a fairly user-friendly rocket fuel. You only need a catalyst coating in the chamber, ignition happens automatically if the catalyst has the right temperature.

The Shuttle also has a proposed update to replace the APUs by something less toxic - but that will never come now.
Yes the Electric APUS(EAPUs). There was also a proposal to replace the OMS/RCS with a non-toxic version that would use LOX and ethanol as the propellants instead of MMH and N204.
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Old 03-31-2008, 10:57 AM   #27
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Who are the female commanders of Space Shuttle missions since STS-1?
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Old 03-31-2008, 11:15 AM   #28
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 Who are the female commanders of Space Shuttle missions since STS-1?
Only Eileen Collins and Pamela Melroy.
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Old 03-31-2008, 01:43 PM   #29
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Who are the space shuttle astronauts died as of March 31, 2008 excluding STS-51L and STS-107?
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Old 03-31-2008, 02:10 PM   #30
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David Griggs, STS-51-D, died in 1989, killed in a crash with a historic WW2 training plane.
Karl Gordon Henize, STS-51-F, died in 1993, because of heart failure while climbing Mount Everest.
Robert F Overmyer, STS-5 and STS-51-B, died 1996, in a crash while testing the Cirrus VK-30 light aircraft.
Charles L Veach, STS-39 and STS-52, died of cancer in 1995.
David M Walker, STS-51-A, STS-30, STS-53 and STS-69, died in 2001, after a brief and sudden illness.
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