MD-3 Ground Power Unit

This unit was designed to provide 28-volt DC 1500 amp, 115/220-volt AC three-phase electrical power for B-47 aircraft for ground operation and start. It also can be used with other aircraft (such as the T-33) that have power requirements compatible with its output. It uses a Continental 180-hp six-cylinder reciprocating engine to drive its electrical generators.

The unit was restored for the museum by the 4950th Field Maintenance Squadron, Wright-Patterson Air Force Base, Ohio, in 1979-1980.

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Screening at Entrance
All visitors may be screened with a metal detector upon entry. In addition all bags are subject to search and may be placed through an X-Ray machine. Weapons are not permitted including pocket knives and firearms, to include conceal carry and other dangerous weapons.
Prohibited Items
Prohibited Items:
- Firearms*
- Knives
- Box cutters
- Food and Soda Drinks
- Alcohol
- Coolers

* Firearms, to include conceal carry and other dangerous weapons, are specifically prohibited in Federal facilities in accordance with 18 USC §930 (c)

Permitted Items:
- Water bottles (clear, sealed bottle, up to 20 oz.)
- Purses
- Camera bags
- Diaper bags
- Strollers
- Service animals

Please note the National Museum of the U.S. Air Force is not responsible for items left in vehicles.
Click here for frequently asked questions regarding items permitted inside the museum.
Visitor Photography Notice
Notice: Visitors may be filmed, photographed or recorded by the U.S. Air Force for educational and promotional uses, including for posting on public websites and social media.
Individuals are permitted to take their own photographs or videos while touring the museum.