LH/RH ENG FIRE PUSH lights do what?

• A. All of the above
• B. Close the affected engine fuel, bleed and hydraulic shutoff valves
• C. Trip off the affected engine driven generator
• D. Arms the squib for bottles 1 and 2

Answer: (D)

When an engine fire is detected, the engine fire push lights indicate that the push button for that engine is being used. The primary function signaled by these lights is to arm the extinguishing system by enabling the squibs for both extinguishing bottles (bottles 1 and 2). In other words, pressing the engine fire push button prepares the two fire bottles to discharge if the system is commanded to release agent. The broader fire suppression steps—like closing valves or tripping the engine generator—are part of the overall procedure, but the lights themselves specifically indicate readiness of the extinguishing squibs.