page_title: Saturn V instrument unit
section_title: Subsystems
hierarchical_section_title: Saturn V instrument unit / Subsystems
caption_attribution_description: English: Diagram of exterior of Saturn V Instrument Unit 514. Numbered scale at top refers to interior location numbers stamped into aluminum at the base of the IU at time of manufacture.
context_page_description: The Saturn V instrument unit is a ring-shaped structure fitted to the top of the Saturn V rocket's third stage and the Saturn IB's second stage. It was immediately below the SLA panels that contained the Lunar Module. The instrument unit contains the guidance system for the Saturn V rocket. Some of the electronics contained within the instrument unit are a digital computer, analog flight control computer, emergency detection system, inertial guidance platform, control accelerometers, and control rate gyros. The instrument unit for Saturn V was designed by NASA at Marshall Space Flight Center and was developed from the Saturn I IU. NASA's contractor to manufacture the Saturn V Instrument Unit was International Business Machines.
  One of the unused instrument units is currently on display at the Steven F. Udvar-Hazy Center in Chantilly, Virginia. The plaque for the unit has the following inscription:
  The Saturn V rocket, which sent astronauts to the Moon, used inertial guidance, a self-contained system that guided the rocket's trajectory. The rocket booster had a guidance system separate from those on the command and lunar modules.
context_section_description: The IU consists of six subsystems: structure, guidance and control, environmental control, emergency detection, radio communications (for telemetry, tracking, and command), and power.
caption: Diagram of exterior of IU-514
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