Maybe RLV rocket engines are certified for restarts, but the main
Zvezda engines are good for one year, and that's it.



Bill the Cat wrote in message .. .
(Explorer8939) wrote in
om:

Bill the Cat wrote in message
...
(Explorer8939) wrote in
om:

Well, not exactly. First off, the ISS "thrusters" are not too
useful for reboost. They are mainly used for attitude control, but
are not particularly useful for orbital changes.

Are you forgetting Zvezda's twin 300-kgf reboost engines?

The Zvezda main thrusters had a certified lifetime of one year, which
expired in 2001.

Nope, the lifetime is specified by number of starts, not time. The engines
are well within the limit.

Also, Progress blocks those thrusters.

Only when there's a Progress there.