判断正误True or False: 当升降舵的一个液压动力控制组件发生卡阻时, 卡阻融性机制确保失效的PCU 被剩下的2个可操纵的液压PCU操控。When a single hydraulic power control unit (PCU) for an elevator is jammed, the jam tolerant mechanism ensures that the failed PCU is overpowered by the remaining two operable hydraulic PCUs.