(Note: Updated 6 May with comment on water transfer from Mike Steinkopf) ESA’s Daniel Firre sent in a note after lunch today (see our post immediately below – Ed.) with a summary/wrap up on some of the activities at ATV-CC this week.
The big event was today’s ISS reboost, which left the Station orbiting 3 m/second faster and over 5 km higher.
To prepare for the reboost, yesterday, NASA astronaut Don Pettit Don closed the protective shutters of the Destiny Lab, Node-3/Cupola and JPM (Japanese Kibo module) windows to prevent their contamination from ATV thrusters.
Reboost manoeuvre No. 3 took place as planned today at 10:37 CEST, “successfully and perfectly in line with planned operations,” writes Daniel. He reported:
The ATV’s propulsive support had a burn duration of 20:21 min:seconds, for a predicted and actual delta-V [increase in velocity] of 3.0 m/s (equals the ‘effort’ produced by ATV thrusters on the ISS complex). This resulted in an altitude raising of the station of 5.26 km… and left us with an ATV 392 kg lighter!
This reboost was needed to prepare/phase the ISS for the coming Soyuz 30 docking.
On 3 May, the team continued troubleshooting the first power chain of the ATV’s Russian Equipment Control System (RECS-1). Daniel says they got lots of data on the system and situation, and will continue troubleshooting. In the meantime, ATV is functioning nominally powered via the back-up RECS-2 chain.
Today, the crew is also scheduled to carry out a check of the functionality & performance of the Russian POTOK Air Purification System, which may have been involved in the loss of RECS-1 power feed from the Russian Service Module (to which ATV-3 is docked) to ATV-3 on 30 March.
6 May :: This update received from Mike Steinkopf – Ed.
Via NASA Daily Update 3 May: Kononenko set up the water transfer hose and pumping equipment and transferred water from Tank 1 of the ATV-3 WDS (Automated Transfer Vehicle 3 Water Delivery System) to a KOV EDV water container (#823). [The 40-minute procedure is specially designed for gas/liquid separation, i.e., to prevent air bubbles larger than ~10 mm from getting into the Elektron’s BZh Liquid Unit where they could cause Elektron shutdown.]
One EDV (22 liter capacity) was filled using the pump unit in the Russian Service Module connected to the ATV Water Tank No. 1 via the ATV Water Delivery Panel. Aim was to fill the Elektron with water. Best regards,
— Mike Steinkopf