Control Locks

Question 1

Which controls need a locking device?

Answer 1

Secondary controls

Question 2

Why do they need locking devices?

Answer 2

Aircraft with manual controls are prone to uncommanded movement of the control surfaces when the aircraft is parked outside during high winds
To prevent damage

Question 3

Internal locks

Answer 3

Physically prevent movement of the cockpit controls

Question 4

External locks

Answer 4

Physically prevent movement of the control surfaces