Which of the following is NOT an appropriate action when securing equipment in an aircraft?

Leaving equipment unsecured is certainly not an appropriate action when securing equipment in an aircraft. Proper aircraft loading and securing of cargo is vital for the safety of the aircraft, crew, and any personnel on board. Secured cargo ensures that it does not shift during takeoff, flight, or landing, which could compromise stability or cause damage.

Checking the cargo weight, using appropriate tiedown devices, and ensuring correct floor angles are all essential practices. Checking cargo weight is important to ensure that the aircraft's weight and balance remain within safe limits, while using tiedown devices is critical for securing cargo and preventing it from moving. Ensuring correct floor angles helps to stabilize the load, further securing it during flight. These practices are integral to effective cargo operations and maintaining safety standards on board an aircraft.