If the fire persists, what action is allowed with CO2 installation?

If the fire persists, what action is allowed with CO2 installation?

• A. Do not discharge CO2 at all.
• B. Discharge CO2 into the exhaust.
• C. Secure all switches and leave the aircraft.
• D. CO2 can be discharged into the inlet duct while it is being cranked.

Answer: (D)

When a fire in the engine area continues, the correct action is to discharge the CO2 into the engine’s inlet duct while the engine is being cranked. Flooding the intake with the extinguishing agent targets the flame where it’s most likely to persist—inside the engine and surrounding compartments—and the engine’s cranking action helps move the CO2 through the inlet and into the combustion zone, enhancing suppression. Discharging into the exhaust wouldn’t reach and suppress the fire effectively, and not discharging at all or abandoning the aircraft would leave the fire unchecked. So, delivering CO2 into the inlet duct during cranking is the proper, allowed measure.

When a fire in the engine area continues, the correct action is to discharge the CO2 into the engine’s inlet duct while the engine is being cranked. Flooding the intake with the extinguishing agent targets the flame where it’s most likely to persist—inside the engine and surrounding compartments—and the engine’s cranking action helps move the CO2 through the inlet and into the combustion zone, enhancing suppression. Discharging into the exhaust wouldn’t reach and suppress the fire effectively, and not discharging at all or abandoning the aircraft would leave the fire unchecked. So, delivering CO2 into the inlet duct during cranking is the proper, allowed measure.