In normal towing procedures, the PARKING BRAKE switch must be set to what position?

In normal towing procedures, setting the PARKING BRAKE switch to the PARKING BRAKE position is essential for ensuring safety and stability while the aircraft is being towed. This position effectively engages the brakes, preventing any unintended movement of the aircraft while it is disconnected from power or ground support systems.

When the PARKING BRAKE is engaged, it helps secure the aircraft in place and allows personnel to safely maneuver around it or perform necessary tasks without the risk of rolling or shifting. It is critical in a towing scenario to prevent accidents and ensure that the aircraft remains stationary until it is ready for movement.

Choosing the PARKING BRAKE position acknowledges that the aircraft should not be able to move inadvertently during preparation for towing or while being connected and disconnected from the towing vehicle. This important safety measure is a standard procedure in aviation best practices.