Docking Module, ASTP Backup

Metal Apollo-Soyuz Test Project Backup Docking Module in museum

In 1971, the US and the USSR agreed to carry out a docking in orbit of the Apollo and Soyuz spacecraft. This project was called the Apollo-Soyuz Test Project (ASTP). An airlock was needed to transition from the American cabin pressure system of 5 pounds per square inch pure oxygen to the Soviet mixed oxygen/nitrogen system at normal atmospheric pressure (about 14.7 psi).

Created By:

Eric Long

Date Created:



Smithsonian National Air and Space Museum


Apollo Program

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