Not present in the companion M992A3 Carrier Ammunition Tracked (CAT) vehicle, the PESA performs two essential tasks: distributing power to the howitzer’s electric gun drives and ramming mechanisms, and providing the control interface between the howitzer’s fire control systems and its electric motion hardware to support automated and manual operation of turret and cannon positioning. Therefore, the M109A7 uses the PESA to enable precise, electrically-driven gun movement and shell loading, reported Army Recognition.
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