Extension, Module Servicing Tool (MST), Mockup, Solar Max Repair Mission


Display Status:

This object is not on display at the National Air and Space Museum. It is either on loan or in storage.

Collection Item Summary:

This mockup Module Servicing Tool drive shaft extension with socket head substitutes for the original part that was lost or repurposed by NASA. When connected to the battery-powered handheld control unit, the extension could reach and loosen or tighten recessed bolts that attached systems modules to the Multimission Modular Spacecraft. Space shuttle astronauts used the tool on the 1984 Solar Max repair mission (STS 41-C) to revive a solar observatory satellite that had prematurely ceased to operate. NASA provided this replacement part in 2015 to complete the Module Servicing Tool control unit previously given to the Museum.

Collection Item Long Description:

Data Source

National Air and Space Museum

Restrictions & Rights

Do not reproduce without permission from the Smithsonian Institution, National Air and Space Museum

Credit Line

Transferred from the National Aeronautics and Space Administration.




  • Approximate: 41.9 × 6.4cm (16 1/2 × 2 1/2 in.)
  • Tapered diameter from 2.5 in. base to 1 in. head

Country of Origin

United States of America



Inventory Number


Related Topics