Text in force at CAR3-14: from CAR3-0, effective 1 Nov 1949. OCR text
When a device is provided for locking a control surface while the airplane is on the ground or water:
(a) The locking device shall be so installed as to provide unmistakable warning to the pilot when it is engaged, and
(b) Means shall be provided to preclude the possibility of the lock becoming engaged during flight.