Display of the ______ warning light may indicate a fire hazard due to a bleed air leak.

Display of the ______ warning light may indicate a fire hazard due to a bleed air leak.

• A. Fuel leak
• B. Cabin overheat
• C. Electrical fire
• D. Heater O/Heat

Answer: (D)

Bleed air is hot air taken from the engine to power the cabin heater. If there’s a leak in that bleed-air path, hot air can escape into the heater assembly or ducts, pushing temperatures up rapidly and creating a real fire hazard. The heater overheat warning light is designed to alert crew to exactly this kind of abnormal condition, signaling that the heater system is overheated and a bleed-air leak may be present. Other indicators, like a fuel-leak warning or electrical-fire warning, aren’t directly tied to a bleed-air leak in the same way, and a cabin overheat light can be caused by other issues not specific to bleed-air leakage.

Bleed air is hot air taken from the engine to power the cabin heater. If there’s a leak in that bleed-air path, hot air can escape into the heater assembly or ducts, pushing temperatures up rapidly and creating a real fire hazard. The heater overheat warning light is designed to alert crew to exactly this kind of abnormal condition, signaling that the heater system is overheated and a bleed-air leak may be present. Other indicators, like a fuel-leak warning or electrical-fire warning, aren’t directly tied to a bleed-air leak in the same way, and a cabin overheat light can be caused by other issues not specific to bleed-air leakage.