Master Timing Unit, Space Shuttle


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 device was part of the avionics for the Space Shuttle Orbital Vehicle-102. It was flown in space on the STS-9 mission. The device was transferred from NASA in 2014. Using a crystal oscillator, it proveded a stable and accurate time reference for all other Orbiter operations.

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, Kennedy Space Center


  • Metal unit: Aluminum, paint, gold, electronics
  • 3-ring binder: Plastic, steel, paper, ink


  • 3-D (Metal unit): 40 x 29.5 x 18.1cm (15 3/4 x 11 5/8 x 7 1/8 in.)
  • 3-D (3-ring binder): 29.2 x 7 x 21cm (11 1/2 x 2 3/4 x 8 1/4 in.)

Country of Origin

United States of America



Inventory Number