What type of locking mechanism is used for the cargo doors?

The cargo doors on the A320 utilize a mechanical locking system. This type of system is designed to ensure that the cargo doors are securely locked during flight, which is critical for safety. Mechanical locks typically engage through physical components that operate in conjunction with the door's closing mechanism, providing a robust and reliable locking method that is less prone to failure compared to electronic or hydraulic systems.

While automatic and hydraulic systems are more commonly associated with other operational aspects of the aircraft, the mechanical system used for the cargo doors is particularly valued for its simplicity and dependability. Its design minimizes the risk of accidental unlocking and ensures that the doors remain securely sealed under various flight conditions.