§29.695 Power boost and power- operated control system

(a) If a power boost or power-operated control system is used, an alternate sy stem m ust be immediately available that allows continued safe flight and landing in the event of – (1) Any single failure in the power portion of the system; or (2) The failure of all engines. (b) Each alternate sy stem m ay be a duplicate power portion or a m anually operated mechanical system. The power portion includes the power source (such as hydraulic pumps), and such item s as valves, lines, and actuators. (c) The failure of m echanical parts (such as piston rods and links), and the j amming of power cylinders, m ust be considered unless they are extremely improbable.