What is the required emergency shutdown order?

• A. Bottles, Batteries, Throttles.
• B. Throttles, Bottles, Batteries.
• C. Batteries, Throttles, Bottles.
• D. Throttles, Batteries, Bottles.

Answer: (B)

The sequence is designed to quickly stop propulsion, then remove fuel, then kill electrical power to minimize fire risk. First, set the throttles to idle to stop engine power and begin cutting off the main fuel flow at the source. Next, close the fuel shutoff valves (the bottles) to seal off any remaining fuel in the lines and pumps, preventing further fuel from reaching the engine or leaking. Finally, switch off the battery to remove all electrical energy from the aircraft systems, reducing the risk of electrical sparks or arcing that could ignite fuel or fluids. Shutting down fuel or power in a different order can leave fuel available longer or keep electrical sources active, increasing fire risk.