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Posted by Gatorcountyr on April 23, 2008, 9:15 pm
Please log in for more thread options On Apr 23, 3:10=A0pm, "Mika Takala"
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> > After they decided to ATO, Houston made calls indicating first "limits
> > to enable" then later "limits to inhibit"...
> > What exactly did they mean by this?
> A ground controller, person who is looking at the telemetry data, saw that=
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> the engine had been shut down because of failing sensors, and the engine
> itself was fine. He then saw similar things happening on a set of sensors
> for another engine, so he commanded the capcom to tell the crew to disable=
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> those sensors - in another words, inhibiting the control systems from
> reacting to out-of-limits data output from the sensors. That then preventi=
ng
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> the engine control logic from shutting down the engine that was in danger =
of
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> being shut down without a valid reason.
> There have been previous usenet discussions of this subject. One of them
> points out that if another engine had been shut down as threathened, the E=
T
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> would have made a hard, unsafe and unacceptable landing to Saudi-Arabia, a=
nd
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> the Orbiter would perhaps have tried a TAL or AOA abort.
> This was one of the cases in which ground controller saved the day.
> --
> Mika Takala
Awesome!
Thank you so much for the detailed answer.
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> to enable" then later "limits to inhibit"...
> What exactly did they mean by this?