14 C.F.R. § 27.679 Control system locks.
Title 14 - Aeronautics and Space
If there is a device to lock the control system with the rotorcraft on the ground or water, there must be means to— (a) Give unmistakable warning to the pilot when the lock is engaged; and (b) Prevent the lock from engaging in flight.
Title 14: Aeronautics and Space
PART 27—AIRWORTHINESS STANDARDS: NORMAL CATEGORY ROTORCRAFT
Subpart D—Design and Construction
Control Systems
§ 27.679 Control system locks.
