ATV-4 mission report 2 August

Update from ATV-CC as of Friday: ATV-4 operating nominally; Restart of the three DPU computers was successful; Last week’s fuel transfer was successful. Lots of ISS support and resupply activity – including liquid waste transfer and O2 repressurisation – coming up in August!

29 July 2013 --- ESA astronaut Luca Parmitano, Expedition 36 flight engineer, performs maintenance on the Water Pump Assembly 2 / Thermal Control System (WPA2/TCS) in the Columbus laboratory of the International Space Station. The pump was delivered to space via ATV-4. Credit: ESA/NASA

29 July 2013 — ESA astronaut Luca Parmitano, Expedition 36 flight engineer, performs maintenance on the Water Pump Assembly 2 / Thermal Control System (WPA2/TCS) in the Columbus laboratory of the International Space Station. The pump was delivered to space via ATV-4. Credit: ESA/NASA

Note as always: All dates/timings below are forecast only and are subject to change as this is a continuing, dynamic mission. Time below indicated in UTC.

GENERAL STATUS
   ·  ATV nominal
   ·  Restart of the three ATV DPU computers
   ·  Successful fuel transfer

ATV STATUS
   ·  Attached dormant mode
   ·  Computer DPU 3 switched to standby mode on 28 July, leading ATV to
      Simplex mode
   ·  Successful restart of the 3 DPUs on Monday 29 July 

ATV-CC STATUS and ATV GROUND SEGMENT
   ·  All ATV-CC systems nominal
   ·  ATV monitoring and routine attached activities

CARGO and FUEL STATUS
   ·  Dry cargo : initial 2 489kg, 100% transferred
   ·  Accepted trash : 1213kg (no change)
   ·  Water : tanks 1 empty, remaining 151kg (73%, 414Kg transferred).
   ·  Air (2 tanks) : 66.3kg. no transfer so far
   ·  Oxygen (1 tank): 33.3kg. no transfer so far
   ·  Propellant : used 1108kg, available for ISS supports : 2 332kg (no
      change)
   ·  Refuelling propellant : 100% transferred (around 860kg)

EXECUTED OPERATIONS
   ·  27 – 28 July : 52P docking (ISS attitude change, no ATV prop support)
   ·  29 July : ATV computers restart
   ·  29 July : Water transfers
   ·  31 July : RFS tanks pressurisation
   ·  01 August : Propellant transfer
   ·  02 August : Water tank1 bladder integrity check

NEXT OPERATIONS. MAIN ACTIVITIES
   ·  09 August: HTV4 berthing (capture 11:30 UTC)
   ·  09 August: liquid waste transfer to tank1 (placeholder)
   ·  12 August: first O2 repressurisation
   ·  13 August: first air transfer
   ·  13 August: RFS Purging and vacuuming
   ·  14 August: Second vacuuming of the oxidizer lines
   ·  15-23 August : ATV hatch closed (EVA on 16 and 22 August tbc)
   ·  23 August : O2 repressurisation (placeholder)
   ·  28 August: Reboost (placeholder)
   ·  29 August : O2 repressurisation (placeholder)
   ·  04 September: HTV4 unberthing
   ·  19 September: Reboost (placeholder)

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