"nominal shutdown"

What was this call? About a min. before MECO, they told the PLT to
expect a nominal shutdown.. never heard that call before -
What would something non-nominal be? Were they referring to abort modes
or something else?

I'm sure I've heard it before. Are we talking meco or shut down of the oms?

Brian

--
Brian Gaff -
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wrote in message
ps.com...
What was this call? About a min. before MECO, they told the PLT to
expect a nominal shutdown.. never heard that call before -
What would something non-nominal be? Were they referring to abort modes
or something else?

wrote in news:1165850581.148885.45950@
16g2000cwy.googlegroups.com:

What was this call? About a min. before MECO, they told the PLT to
expect a nominal shutdown.. never heard that call before -
What would something non-nominal be? Were they referring to abort modes
or something else?


I'm guessing that the call meant propulsion performance was as
expected, and that shutdown would occur at the predicted time.
In other words, no surprises were expected.

--Damon

wrote:
What was this call? About a min. before MECO, they told the PLT to
expect a nominal shutdown.. never heard that call before -
What would something non-nominal be? Were they referring to abort modes
or something else?

A nominal shutdown occurs when the shuttle reaches a predetermined
velocity with residual propellants still in the tank. The alternative
would
be a propellant depletion (empty tank) cutoff, triggered by propellant
depletion sensors in the tanks. A unexpected depletion cutoff
happened on Columbia's STS-93 mission in 1999 after a small leak
developed in one of the SSMEs, leaving the orbiter a bit shy of the
planned shutdown velocity.

- Ed kyle