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Being immobile, AESA radars have vastly simpler mechanical designs. They require no complex hydraulics for antenna movement nor hinge appendages that are prone to failure and replacement. The AESA radar occupies less space than typical radar, because of its lesser infrastructure requirements and of course its absent range of motion. With these improvements, maintenance crews are far less severely taxed, and the radar is much more reliable.
Mechanical steering may be added to AESA radars for increased radar field of view, however, no such equipped AESA radars currently exist. The movement performance of the antenna would not need to be nearly as great as that of a traditional radar, as the radar sweep is not integral to the contact update rate.