Fixed Eye Point (FEP): CAD accommodation model
The FEP CAD model is intended to provide the composite boundaries representing the body of the defined user population, including the effects of body size, protective equipment and gear. The boundaries defined include the required space needed for the equipped users’ helmet, torso, elbows, knees, and boots. Clearances between the user and surrounding interior vehicle surfaces have been added per MIL-STD-1472 (e.g. head clearance required from head (helmet) to vehicle roof line).
The FEP CAD model is applicable to ground vehicles driver workstations where the users tend toward a common eye point for performing tasks. This encompasses several scenarios, including the use of indirect vision systems (i.e., vision blocks or displays). The associated tools are also applicable to non-driver workstations equipped with adjustable seats that require the crew to interact with controls and displays using hands and a common eye point.