PFCS= Pump Flow Control System.
Launch data:
| Launch date | 02 Apr 2018 |
| Launch site | CC, SLC-40 |
| Launch vehicle |
Falcon-9 v1.2 |
| Mission | ISS component launched with Dragon CRS-14 |
| Earth orbit on ISS |
Description:
- The pump and flow control subassembly (PFCS) is an orbital replacement unit (ORU) on the Space Station Freedom photovoltaic power module (PVM). The PFCS pumps
liquid ammonia at a constant rate of approximately 1170 kg/hr while providing temperature control by flow regulation between the radiator and the bypass loop. Also,
housed within the ORU is an accumulator to compensate for fluid volumetric changes as well as the electronics and firmware for monitoring and control of the photovoltaic
thermal control system (PVTCS). Major electronic functions include signal conditioning, data interfacing and motor control.
- As of Apr 11, 2018 there were 12 PFCS units on ISS: the serial numbers are from 1 to 12, NASA have confirmed that PFCS 4 is indeed S/N 0004.
Each of the solar-panel-bearing segments P4, P6, S4, S6 has two PFCS; in addition P6 has two extra PFCS slots for the Early Active Thermal Control System which
operated from 2000 to 2007. One spare unit is stored on External Stowage Platform 1 (ESP1).
Locations, Launch and end fonction date:
Location Dates Nickname
PFCS 1 P6 EATCS1 2000 Dec 1 to 2013 May 11.
P6 Channel 2B, 2013 May 11 to present
PFCS 2 P6 EATCS2 2000 Dec 1 to 2018 Apr 11 'Trippy'
Dextre EOTP 2018 Apr 11 to 2018 Apr 14
Dragon CRS-14 Trunk 2018 Apr 14 to 2018 May 5, destroyed on reentry
PFCS 3 P6 Channel 4B 2000 Dec 1 to present
PFCS 4 P6 Channel 2B 2000 Dec 1 to 2013 May 11 'Leaky' S/N 0004
P6 EATCS 1 2013 May 11 to 2018 May 10
Dextre EOTP 2018 May 10 to 2018 May 16
ESP-1 2018 May 16 to present
PFCS 5 ESP-1 (spare) 2001 Mar 13 to 2018 May 16 'Frosty'
Dextre EOTP 2018 May 16 to 2018 May 17
P6 EATCS1 2018 May 17 to present
PFCS 6 P4 Channel 2A 2006 Sep 9 to present
PFCS 7 P4 Channel 4A 2006 Sep 9 to present
PFCS 8 S4 Channel 1A 2007 Jun 8 to present
PFCS 9 S4 Channel 3A 2007 Jun 8 to present
PFCS 10 S6 Channel 1B 2009 Mar 15 to present
PFCS 11 S6 Channel 3B 2009 Mar 15 to present
PFCS 12 Dragon CRS-14 Trunk 2018 Apr 2 to 2018 Apr 11 'Motley'
P6 EATCS2 2018 Apr 11 to present
Note:
- PFCS 2 ′Trippy′ was moved to the Dragon CRS-14 trunk on Apr 14, 2018 and it was destroyed on the trunk′s reentry on May 5. CRS-14 had delivered
PFCS12 ′Motley′ to replace it.
- PFCS 4 ′Leaky′ was then robotically extracted from the P6 and placed on Dextre′s temporary holding location, the EOTP.
