§25.679 Control system gust locks

(See AMC 25.679) (a) There must be a device to prevent damage to the control surfaces (including tabs), and to the control system, from gusts striking the aeroplane while it is on the ground. If the device, when engaged, prevents normal operation of the control surfaces by the pilot, it must – (1) Automatically disengage when the pilot operates the primary flight controls in a normal manner; or (2) Limit the operation of the aeroplane so that the pilot receives unmistakable warning at the start of take-off. (See AMC 25.679(a)(2).) (b) The device must have means to preclude the possibility of it becoming inadvertently engaged in flight. (See AMC 25.679(b))