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"Robert C. Leif, Ph.D." <[log in to unmask]>
Wed, 8 Nov 2000 07:29:59 -0800
text/plain (70 lines)
From: Bob Leif
To: Craig Spannring et al.
I wonder how many billions the demise of the Ada Mandate will cost us. A
previous, very expensive failure was the lack of separation of the
antimissile warhead from the rocket. Was this the result of a software
error? In what language is Star Wars II being programmed? I suspect that, at
present, the simulations are much more important than the media events. I do
believe that the chivalry shown by the US Defense Department in originally
funding an excellent Ada compiler and ensuring its availability in its
entirety to our enemies was excessive.

-----Original Message-----
From: Team Ada: Ada Advocacy Issues (83 & 95)
[mailto:[log in to unmask]]On Behalf Of Craig Spannring
Sent: Wednesday, November 08, 2000 12:11 AM
To: [log in to unmask]
Subject: Re: NASA X-38 Question


Roger Racine writes:
 > At 02:01 PM 11/3/2000 , [log in to unmask] wrote:
 > >NASA's page on the recently tested X-38 crew return vehicle
 > >(http://www.dfrc.nasa.gov/PAO/PAIS/HTML/FS-038-DFRC.html) contains the
 > >following statement:
 > >
 > >"The X-38 flight computer is commercial equipment that is currently used
 > >in aircraft, and the flight software operating system is a commercial
system
 > >already in use in many aerospace applications."
 > >
 > >Does anyone on this list have more details on the X-38 software that
they
 > >can share?
 > >
 > >F. Britt Snodgrass
 >
 > VxWorks OS, application software is written in C.
 >
 > Roger Racine



>From comp.risks-

  Date: Mon, 6 Nov 1972 16:46:10 -0500 (EST)
  From: "James H. Paul" <[log in to unmask]>
  Subject: Unplanned roll in NASA's X-38

  *Aviation Week & Space Technology*, 6 Nov 2000, p. 24

  "NASA's X-38 Vehicle 131R did a slow, 360-deg. roll after release from its
  B-52 carrier aircraft on Nov. 2.  It was the first free flight of the
  vehicle, which automatically stabilized under the preprogrammed deployment
  of a drogue chute and made a successful landing under parafoil on a dry
  lakebed runway, as scheduled, at Edwards AFB, Calif.  The vehicle
sustained
  no damage in the test.  Project officials said they would have to do some
  trouble-shooting to figure out why the Crew Return Vehicle (CRV) prototype
  rolled at an estimated average rate of about 20 deg. per sec. during its
24
  sec. of scheduled free flight.  A software problem in the vehicle's flight
  control system was suspected, although project officials were also looking
  at whether aerodynamic disturbances immediately after separation might
have
  played a role.  Actual separation from the B-52 was clean, and the flight
  control system maintained angle of attack throughout the 18-sec. roll.
The
  vehicle is an 80%-scale version of the CRV designed to provide emergency
  escape for International Space Station crews."

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