Docking Probe
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The Docking Probe is used to attach the Command Module to the Lunar Module or other spacecraft.
Operation
The probe first plugs into the attachment on the other spacecraft, then gas pressure is used to retract the probe into the CM, pulling the two spacecraft together into a 'hard dock' where the spacecraft will latch together with an air-tight seal and electrical connection.
A standard Apollo mission will have two dockings, one when the LM is extracted from the SIVB, the other when the LM Ascent Stage returns to lunar orbit. However, to maintain the redundancy standard of the Apollo flights, four gas charges are provided, allowing for a successful mission despite two failures.
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