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Aerospace connectors are expected to withstand regular mating and unmating during maintenance, component replacement, etc. It is important that a connector be adequately secured when in use, but not so tightly mated as to hinder the ability to unmate for maintenance. The shell spring finger force test evaluates the force required to engage and separate two mated connectors.
A sample connector is mated and unmated ten (10) times. Force measurements are made on the mating of the first cycle and on the unmating of the tenth cycle. The measured forces must be within the applicable range as specified in the testing standard.