Text in force at CAR3R-8: from CAR3R-0, effective 15 May 1956. OCR text
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.