What security practice is required by DOI for unattended aircraft?

A dual method for securing unattended aircraft is crucial for ensuring safety and preventing unauthorized access. This approach typically involves using two different security measures, which can include physical methods such as locking the aircraft and securing control surfaces, as well as procedural measures such as maintaining a flight log or using alarm systems.

Implementing a dual method increases the redundancy of security efforts, making it more difficult for unauthorized individuals to access the aircraft and reducing the risk of theft, vandalism, or potential tampering. This practice aligns with broader aviation security protocols that aim to protect aircraft at all times, especially when they are not actively in use.

In contrast, relying on only one method may not provide sufficient security, as a single point of failure could easily be exploited. Leaving the aircraft unlocked poses a significant risk, as it invites unauthorized entry. Monitoring with cameras alone, while useful, does not provide active deterrence or physical security, making it an inadequate response on its own.