Text in force at CS29-12: from CS29-0, effective 14 Nov 2003.
If there is a device to lock the control sy stem with the rotorcraft on the ground or water, there m ust be means to:
(a) Automatically disengage the lock when the pilot operates the controls in a normal manner, or limit the operation of the rotorcraft so as to give unmistakable warning to the pilot before take-off, and
(b) Prevent the lock from engaging in flight.
ED Decision 2003/016/RM · Source