Cockpit heat is provided by _______, routed through a heat exchanger and/or a heat exchanger bypass valve, through the firewall, and into the cockpit.

The correct answer is warm engine bleed air. This is because the T-6B utilizes bleed air from the engines to provide cabin heat. Warm engine bleed air is extracted from the engine’s compressor section and routed through a heat exchanger which allows the heat from the engine to warm the cockpit air before it enters the cabin. This design leverages the heat produced during normal engine operation to enhance comfort within the cockpit without requiring a separate heating mechanism.

Filtered engine exhaust, electrically heated air, and recirculated cockpit air are not used to heat the cockpit in the T-6B. Filtered engine exhaust does not effectively provide the necessary heat for cabin comfort, as it is primarily composed of gases that do not contribute to warming air for this purpose. Electrically heated air is not part of the T-6B heating system, as the aircraft does not rely on electrical heating for cockpit warmth. Finally, while recirculated cockpit air can help maintain a comfortable environment, it does not provide the primary source of heat; instead, it works in conjunction with the cabin heating system.