Table of Contents

Mission Overview - Fact Sheet

About the Mission

• The Mobile Base System (MBS) is the second Canadian contribution to the International Space Station and the second element of the Canadian Mobile Servicing System or MSS;

• The MBS is installed on the Mobile Transporter, which slides across the Station on a rail system installed on the Truss;

• Canadarm2 will have the capability to move hand-over-hand from the U.S. Lab fixture to the MBS, then travel along the Truss to 10 different work sites once the assembly is complete;

• STS-111 marks the 14th Station assembly flight.

• Crews:

  Shuttle Crew:
  Kenneth Cockrell: Shuttle Commander
  Paul Lockhart: Pilot
  Franklin Chang-Diaz: Mission Specialist
  Philippe Perrin: Mission Specialist
  
  ISS Crew up (Expedition 5):
  Valeri Korzun: ISS Commander
  Peggy Whitson: Flight Engineer
  Sergei Treschev: Flight Engineer
  
  ISS Crew Down (Expedition 4):
  Yuri Onufrieyenko: ISS Commander
  Carl Walz: Flight Engineer
  Dan Bursch: Flight Engineer

About the MBS

• Size: 5.7 x 4.5 x 2.9 metres
• Mass: 1,500 kg
• Mass handling transportation capacity: 20,900 kg
• Degrees of freedom: fixed
• Peak power (operational): 825 W
• Average power (keep alive): 365 W

Key Components of the MBS

• POA: Payloads/Orbital Replacement Unit Accommodation Will be used to carry large structural elements such as trusses across the length of the Station.

• MCAS: MBS Common Attachment System. The MCAS consists of three payload alignment V-guides with ready-to-latch indicators; a powered claw to grip a special capture bar on payloads; a camera target for payload berthing; and an Umbilical Mating Assembly (UMA) which provides power and data exchange to payloads such as scientific experiments. A number of experiments will be positioned on the external structure of the Station, each payload held in devices similar to the MCAS.

• CLPA: Camera/Light/PTU Assembly Colour camera that will be used to monitor the mating of the Mobile Base System to the Mobile Transporter. Will be placed on the POA mast to provide overall view of the Mobile Base System.

• 4 PDGF: Power Data Grapple Fixtures offering anchor points to Canadarm2 and eventually the SPDM. Located on the four corners of the Mobile Base System, they provide electricity to the arm and transfer computer commands and video signals between Canadarm2 and a Robotic Workstation inside the Station.

• EVA Aids: Will provide support to astronauts during spacewalks.

Mobile Base System functions

• A platform and storage facility;

• Can support Canadarm2, payloads and eventually the SPDM during Mobile Transporter translation across the Station;

• Can support Extravehicular Activities (EVA) through EVA aids.

About Mobile Transporter

• Size: 27.4 x 26.2 x 9.6 metres
• Speed (maximum rate): 90 metres per hour or 2.5 cm per second
• Mass: 886 kg
• Mass handling transportation capacity: 20,954 kg

• US-built movable base on which the MBS will be mated;

• Set atop the Integrated Truss;

• Will allow Canadarm2, payloads and eventually the Special Purpose Dexterous Manipulator (SPDM) to travel across the Station Truss (after delivery of MBS);

• Delivered and installed on mission STS-110/8A;

• Will allow the Mobile Base System to move to 10 pre-designated Space Station work sites.

About the Truss

• Length once assembly completed: 108.5 metres
• Integrated Truss Structure S0: Centre segment of Station Truss

• Delivery and assembly of the rail should be completed in four years, over the course of eight space shuttle missions;

• S0 was attached to the US Lab during Mission STS-110/8A;

• By assembly complete, four more truss segments will be attached to either side of the S0 Truss;

• A rail set on the Truss allows the Mobile Transporter to slide across the Station.