True or False: Placing the vent control lever in the CANOPY position opens the defog valve.

The correct explanation is that placing the vent control lever in the CANOPY position does not open the defog valve, making the statement false. The defog valve is designed to direct air to the cockpit to help prevent fogging on the canopy during flight, but it operates independently of the vent control lever's position. In the CANOPY position, the airflow is directed to the canopy area without specifically activating the defogging function. Instead, the defog valve would typically be operated by other means or lever positions, which are intended specifically for that purpose.

This understanding clarifies that while the CANOPY setting adjusts airflow, it does not relate directly to the functionality of the defogging system. Thus, stating the original proposition as true would be inaccurate.