Which component must be inspected before towing an aircraft?

The tow bar is a crucial component that must be inspected before towing an aircraft because it is the device that connects the aircraft to the towing vehicle. Ensuring that the tow bar is in good condition and properly secured is essential for operational safety. A faulty or improperly connected tow bar can lead to accidents, such as the aircraft becoming uncoupled during towing or causing damage to the aircraft or surrounding equipment.

In addition to the tow bar, other considerations should be taken into account during pre-towing inspections, but none are as directly related to the towing process itself. For example, while inspecting the main landing gear is important for overall aircraft safety and functionality, it is not specific to the towing procedure. Similarly, checking cockpit instruments and fuel tanks, while part of regular aircraft inspections, are not directly relevant to the towing mechanics and safety. Thus, the tow bar's inspection is specifically critical for the towing operation's success and safety.