Abmd70.165
net.columbia
utzoo!decvax!duke!bmd70!jcp
Tue Nov 10 00:40:57 1981
STS 1 vs STS 2

A summary of mission differences from STS 1 to STS 2

	Item		STS 1		STS 2		Comments
Orbit Inclination	40.3 deg	38.0 deg	Required for added
							ascent performance.
Altitude		150 nm.		137 nm		Lowered to offload
							OMS propellent
Acscent Max Q		610 psf.	640 psf.	Test program
Acscent Madrid Coverage	4.6 min		2.2 min		Lower inclination
							and altitude
Abort to Rota, Spain	NO single SSME	5 sec abort	Contigency Manual
			out required	region		procedure
Abort once around site	Northrup AFB	Edwards AFB	Lower inclination
Flight Duration		54.5 hr.	124.2hr		Lower than expected
							1, one added cyrogenic
							fuel tank
Post deorbit Guam	7.1 min		2.9 min		Lower inclination
	tracking
Cargo			Dev. flight	+ OSTA-1,RMS	OSTA-1 - Earth viewing
			instruments	IECM		RMS - remote manipulator
							IECM - Induced environ-
							ment contam. monitor
On-orbit Tests		None		RMS, Backup orbit navigation,
					Payload pointing, OSTA-1
Entry Tests		None		Test Manuevering, autoland to preflare,
					possible crosswind landing

This was digest from the November 9th issue of Aviation Week and
Space Technology.

Another Columbia note:

	The APU oil problem was explained as leakage of hydrazine fuel
around a carbon gasket into the oil, causing a chemical reaction which
produces a soapy, waxy polymer chain, which clogs the oil filter, causing
it to be bypassed automatically, which will work, but is hazardous.

	APU 2 was not affected by this problem, as it was a replacement
for an APU which malfunctioned during STS-1 flight.

Aviation Week Note:
	If desired, I will submit a summary of the latest stuff in
AW&ST each week, as I get it anyway, and am a regular net user.

					-Joe Pistritto-

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 Bruce Jones, Henry Spencer, David Wiseman.