When is the loading plan most critical?

The loading plan is most critical when mixing internal and external loads because ensuring stability and weight distribution is vital for the helicopter's safety and performance during flight. When both types of loads are present, it is necessary to carefully balance them to maintain the helicopter's center of gravity, which can be affected by weight shifts that occur during takeoff, flight, and landing. An improperly balanced load can lead to handling difficulties, increased risk of accidents, and may compromise the mission's effectiveness.

In addition, careful planning is needed to ensure that the loading does not interfere with the helicopter's rotors or other operational features, preventing interference with external loads. Each kind of cargo or personnel has specific requirements, thus mixing them demands meticulous planning to avoid accidents and to ensure a successful flight operation.