Which statement describes the temperature-related prohibition for canopy operation?

• A. Open canopy only when the aircraft is moving.
• B. Keep the canopy closed after engine start.
• C. Do not use battery power to open canopy below zero degrees Fahrenheit.
• D. Open the canopy for ventilation during flight.

Answer: (C)

The key idea is understanding how extreme cold affects the canopy drive system. When the temperature drops to or below zero Fahrenheit, the aircraft battery’s performance degrades significantly—its voltage sags and its ability to deliver the current needed to power the canopy motor diminishes. Relying on battery power under those conditions can prevent the canopy from opening reliably, which could trap the crew in an emergency or delay egress. To prevent that risk, the procedure prohibits using battery power to open the canopy when the temperature is below zero Fahrenheit, ensuring a safer, more reliable way to access the cockpit in cold weather (such as using a manual release or warming the system as required).

The other statements describe general canopy operations that aren’t about this specific cold-weather limitation—opening the canopy while the aircraft is moving, keeping it closed after engine start, or opening it for ventilation in flight—none of which addresses the cold-temperature reliability concern.