Andrew Gray wrote in
:

In article , Brian Gaff
wrote:
Do you really need five to seven people on a Hubble service mission?

Quite probably.

STS-103 flew with seven; it made three two-man EVAs over three days.
STS-61 made five over five; ditto 109 and 82. (61 was planned for up
to seven...)

To do multiple EVAs, it's standard practice (AIUI, someone please
correct me) to have two pairs; group A does it one day, group B the
next, then A... remember, these are strenuous physical activities, in
some cases lasting over eight hours. Rotation is advisable.

A two-man team can do three EVAs, provided they get a day off in between
each one. Two pairs are standard for four or more EVAs.

So, you have four there. You then need people to do everything else -
to operate the Shuttle, the arm, whatever else they do (I never paid
greatly much attention g) - it's an intensive mission, they're not
just deadweight.

Right. The arm operator and the IVA crewmember need to be separate people,
because they have to pay attention to different things. So the minimum crew
size for a dual-pair EVA flight is six.


--
JRF

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