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



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?