The Control Bypass Assembly (CBA) is part of the umbilical assembly which connects the Microclimate Cooling Garment (MCG) to the Microclimate Cooling Unit (MCU) making up the Microclimate Cooling System (MCS).
The purpose of the MCS is to provide heat stress relief to aviation and ground personnel operating military vehicles. The MCU provides chilled fluid for suit cooling to crew members through an umbilical which is equipped with a CBA.
The CBA includes a variable speed control attached to the umbilical which provides cooling capacity adjustment set by the user. The CBA also includes a pressure relief valve which will “bypass” the MCG if the differential pressure across the valve exceeds 15 ± 5psi.