From: molagnon@ifremer.fr (Michel OLAGNON)
Subject: Re: Ariane 5 failure
Date: 1996/09/25
Date: 1996-09-25T00:00:00+00:00 [thread overview]
Message-ID: <52amke$m9e@ys.ifremer.fr> (raw)
In-Reply-To: 52a572$9kk@goanna.cs.rmit.edu.au
In article <52a572$9kk@goanna.cs.rmit.edu.au>, rav@goanna.cs.rmit.edu.au (@@ robin) writes:
>[reports of Ariane and STS-2 bugs deleted]
>
>
>In both cases, the programing error could have been detected
>with a simple test, but in both cases, no test was included.
>
>One would have thought that having had one failure (at least)
>for integer out-of-range, that the implementors of the software
>for Ariane 5 would have been extra careful in ensuring that
>all data conversions were within range -- since any kind
>of interrupt would result in destruction of the spacecraft.
>
May be the main reason for the lack of testing and care was
that the conversion exception could only occur after lift off,
and that that particular piece of program was of no use after
lift off. It was only kept running for 50 s in order to
speed up countdown restart in case of an interruption between
H0-9 and H0-5.
Conclusion: Never compute values that are of no use when you can
avoid it !
>There's a case for a review of the programming language used.
Michel
--
| Michel OLAGNON email : Michel.Olagnon@ifremer.fr|
| IFREMER: Institut Francais de Recherches pour l'Exploitation de la Mer|
next prev parent reply other threads:[~1996-09-25 0:00 UTC|newest]
Thread overview: 105+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <agrapsDy4oJH.29G@netcom.com>
1996-09-25 0:00 ` Ariane 5 failure @@ robin
1996-09-25 0:00 ` Michel OLAGNON [this message]
1996-09-25 0:00 ` Chris Morgan
1996-09-25 0:00 ` Byron Kauffman
1996-09-25 0:00 ` A. Grant
1996-09-25 0:00 ` Ken Garlington
1996-09-26 0:00 ` Byron Kauffman
1996-09-27 0:00 ` A. Grant
1996-09-26 0:00 ` Sandy McPherson
1996-09-25 0:00 ` Bob Kitzberger
1996-09-26 0:00 ` Ronald Kunne
1996-09-26 0:00 ` Matthew Heaney
1996-09-27 0:00 ` Wayne Hayes
1996-09-27 0:00 ` Richard Pattis
1996-09-29 0:00 ` Alan Brain
1996-09-29 0:00 ` Dann Corbit
1996-09-29 0:00 ` Chris McKnight
1996-09-29 0:00 ` Real-world education (was: Ariane 5 failure) Michael Feldman
1996-10-01 0:00 ` Ariane 5 failure Ken Garlington
1996-09-27 0:00 ` Ronald Kunne
1996-09-27 0:00 ` Lawrence Foard
1996-10-04 0:00 ` @@ robin
1996-09-28 0:00 ` Ken Garlington
1996-09-28 0:00 ` Ken Garlington
1996-09-29 0:00 ` Alan Brain
1996-09-29 0:00 ` Robert A Duff
1996-09-30 0:00 ` Wayne L. Beavers
1996-10-01 0:00 ` Ken Garlington
1996-10-01 0:00 ` Wayne L. Beavers
1996-10-01 0:00 ` Ken Garlington
1996-10-02 0:00 ` Sandy McPherson
1996-10-03 0:00 ` Richard A. O'Keefe
1996-10-01 0:00 ` Ken Garlington
1996-09-28 0:00 ` Ken Garlington
1996-09-27 0:00 ` Ken Garlington
1996-09-27 0:00 ` Alan Brain
1996-09-28 0:00 ` Ken Garlington
1996-09-29 0:00 ` Louis K. Scheffer
1996-09-27 0:00 ` John McCabe
1996-10-01 0:00 ` Michael Dworetsky
1996-10-04 0:00 ` Steve Bell
1996-10-07 0:00 ` Ken Garlington
1996-10-09 0:00 ` @@ robin
1996-10-09 0:00 ` Steve O'Neill
1996-10-12 0:00 ` Alan Brain
1996-10-04 0:00 ` @@ robin
1996-10-04 0:00 ` Michel OLAGNON
1996-10-09 0:00 ` @@ robin
1996-10-04 0:00 ` Joseph C Williams
1996-10-06 0:00 ` Wayne Hayes
1996-10-17 0:00 ` Ralf Tilch
1996-10-17 0:00 ` Ravi Sundaram
1996-10-22 0:00 ` shmuel
1996-10-22 0:00 ` Jim Carr
1996-10-24 0:00 ` hayim
1996-10-25 0:00 ` Michel OLAGNON
1996-10-25 0:00 ` Ken Garlington
1996-10-01 0:00 Marin David Condic, 407.796.8997, M/S 731-93
1996-10-02 0:00 ` Ken Garlington
-- strict thread matches above, loose matches on Subject: below --
1996-10-01 0:00 Marin David Condic, 407.796.8997, M/S 731-93
1996-10-02 0:00 ` Alan Brain
1996-10-02 0:00 ` Ken Garlington
1996-10-02 0:00 ` Matthew Heaney
1996-10-04 0:00 ` Robert S. White
1996-10-05 0:00 ` Robert Dewar
1996-10-05 0:00 ` Alan Brain
1996-10-06 0:00 ` Robert S. White
1996-10-03 0:00 ` Alan Brain
1996-10-04 0:00 ` Ken Garlington
1996-10-01 0:00 Marin David Condic, 407.796.8997, M/S 731-93
1996-10-02 0:00 ` Robert I. Eachus
1996-10-02 0:00 ` Ken Garlington
1996-10-02 0:00 ` Matthew Heaney
1996-10-04 0:00 ` Ken Garlington
1996-10-05 0:00 ` Robert Dewar
1996-10-06 0:00 ` Keith Thompson
1996-10-10 0:00 ` Ken Garlington
1996-10-14 0:00 ` Matthew Heaney
1996-10-15 0:00 ` Robert Dewar
1996-10-16 0:00 ` Ken Garlington
1996-10-18 0:00 ` Keith Thompson
1996-10-18 0:00 ` Samuel T. Harris
1996-10-21 0:00 ` Ken Garlington
1996-10-18 0:00 ` Ken Garlington
1996-10-23 0:00 ` robin
1996-10-03 0:00 Marin David Condic, 407.796.8997, M/S 731-93
1996-10-03 0:00 Marin David Condic, 407.796.8997, M/S 731-93
1996-10-03 0:00 Marin David Condic, 407.796.8997, M/S 731-93
1996-10-14 0:00 Marin David Condic, 407.796.8997, M/S 731-93
1996-10-15 0:00 ` Robert I. Eachus
1996-10-15 0:00 ` Robert Dewar
1996-10-16 0:00 ` Michael F Brenner
1996-10-16 0:00 ` Robert Dewar
1996-10-23 0:00 ` robin
1996-10-16 0:00 Marin David Condic, 407.796.8997, M/S 731-93
1996-10-18 0:00 ` Ken Garlington
1996-10-19 0:00 ` Frank Manning
1996-10-21 0:00 ` Norman H. Cohen
1996-10-21 0:00 Marin David Condic, 407.796.8997, M/S 731-93
1996-10-22 0:00 ` Adam Beneschan
1996-10-28 0:00 Marin David Condic, 561.796.8997, M/S 731-93
1996-10-29 0:00 ` Ken Garlington
1996-11-08 0:00 ` robin
1996-10-28 0:00 Marin David Condic, 561.796.8997, M/S 731-93
1996-10-31 0:00 Marin David Condic, 561.796.8997, M/S 731-93
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