Manned Maneuvering Unit

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    Manned Maneuvering Unit

    Propulsion backpack used by astronauts during extravehicular activity (EVA) on Shuttle missions; includes thrusters, switches, hand controllers, locator lights, restraint belts, decals (NASA logos, US flags, and MMU emblem); black on silver number 3 decals on top, back, sides, bottom.

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    Manned Maneuvering Unit

    The Manned Maneuvering Unit is located at the Museum's Steven F. Udvar-Hazy Center in Chantilly, Virginia.

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    Bruce McCandless and the Manned Maneuvering Unit (MMU)

    On February 7, 1984 during Space Shuttle mission STS 41-B, astronaut Bruce McCandless made the first untethered spacewalk as he flew some 300 feet from the Shuttle in the first test of the MMU. This image was taken several days later on February 11.

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    Manned Maneuvering Unit

    Curator Valerie Neal describes the Manned Manuevering Unit, or MMU, on display at the Udvar-Hazy Center in Chantilly, Virginia.

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Display Status:

This object is on display in the James S. McDonnell Space Hangar at the Steven F. Udvar-Hazy Center in Chantilly, VA.

James S. McDonnell Space Hangar

The Manned Maneuvering Unit (MMU) is a backpack propulsion device that gave astronauts mobility for extravehicular activities outside the Space Shuttle. It enabled them to maneuver within the payload bay or fly some distance away without needing safety tethers anchored to the vehicle. The MMU had 24 small gaseous nitrogen thrusters and was operated with hand controllers on the arms of the unit.

On February 7, 1984, on Space Shuttle mission STS 41-B, astronaut Bruce McCandless tested this MMU, serial number 3. He made the first untethered spacewalk as he flew some 300 feet from the Shuttle. This MMU also flew on missions STS 41-C as the backup unit for the Solar Max satellite retrieval and STS 51-A as the prime unit for retrieving the Palapa communications satellite. Astronauts Bruce McCandless, Robert Stewart, James van Hoften, and Joseph Allen flew MMU #3 a total of 6 hours 29 minutes during these three 1984 missions. The MMUs were not used again.

NASA transferred this one to the Museum in 2001.