What is one component of the 00-80T-120 manual?

The correct choice pertains to hand signals used on the flight deck, which is an essential aspect covered in the 00-80T-120 manual. This manual serves as a vital resource for flight deck operations, detailing the standard hand signals necessary for effective communication among personnel during aircraft operations. These signals are particularly important in the noisy environment of a flight deck where verbal communication can be difficult.

Hand signals ensure that aircraft movement is conducted safely and efficiently, helping to prevent accidents and ensuring that all crew members and personnel remain coordinated. The training and knowledge of these signals are crucial for anyone involved in aircraft handling and operations on the flight deck, underscoring their significance outlined in the manual.

In contrast, while the other options present important topics relevant to aviation and flight operations, they are not components of the 00-80T-120 manual. Aircraft weight and balance are covered under different guidelines or manuals, and while maintenance troubleshooting procedures and emergency evacuation procedures are critical aspects of aviation safety and operations, they would typically be found in separate operational manuals designed specifically for those purposes rather than in the 00-80T-120.