Which of the following is included in the Tiedown Equipment Checklist?

The inclusion of chains and straps in the Tiedown Equipment Checklist is essential for ensuring the safe and secure anchoring of aircraft. Tiedown equipment is crucial for keeping the aircraft stable in adverse weather conditions and preventing movement during ground operations. Chains and straps serve as physical restraints that secure the aircraft to the ground or a designated surface. This is particularly important in scenarios like high winds, where an aircraft could be susceptible to movement if not properly secured.

In contrast, while communication devices, emergency medical supplies, and navigational aids are critical for flight operations, they do not relate specifically to the physical requirements necessary for tiedown procedures. Therefore, the focus of the checklist on chains and straps emphasizes their role in maintaining the safety and integrity of the aircraft when it is not in operation.