Pat Flannery wrote in
:

Jeff Findley wrote:

I'm not sure I understand this since the tanks on ISS can feed the
thrusters on a docked Progress (certainly one docked at the aft port,
not sure about other ports). It seems like this would be more useful
for a collision avoidance maneuver when a Progress isn't docked, or
for some reason the Progress engines fail to fire (from what I've
read, you can still fire the ISS thrusters even when a Progress is
docked to the aft port).

We discussed this a couple of years back, when the loss of Columbia
ended the regular Shuttle reboosts.
The Zvezda module apparently has left-over fuel still onboard that
could give a significant boost to the ISS' altitude.

Right. And as others have stated, Zvezda can interconnect to a docked
Progress on either port to reboost the station even if Zvezda's own engines
are inop. (And even if there is no Progress docked, don't forget that only
one Zvezda engine failed; they can still do single-engine burns if they
must.)

--
JRF

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