What does the engine fire detector test switch enable the crew to check?

What does the engine fire detector test switch enable the crew to check?

• A. ENG FIRE PUSH lights
• B. All of the above
• C. Integrity of the engine fire detector systems
• D. Operation of the alarm bell

Answer: (B)

The engine fire detector test switch exercises the entire fire warning annunciation circuit so you can verify everything works together. When you test it, the system triggers the engine fire warning indicators, causing the ENG FIRE PUSH lights to illuminate so you can visually confirm the warning. It also checks the detector circuitry itself, ensuring the fire detector units and wiring are intact (integrity of the detector systems). At the same time, the audible warning bell should operate, confirming the alarm sound is functioning so crew alarms can be heard. So the test confirms visual warnings, detector integrity, and audible annunciation—covering all aspects of the warning system. If any part doesn’t respond, it flags a fault in that portion of the fire warning system.

The engine fire detector test switch exercises the entire fire warning annunciation circuit so you can verify everything works together. When you test it, the system triggers the engine fire warning indicators, causing the ENG FIRE PUSH lights to illuminate so you can visually confirm the warning. It also checks the detector circuitry itself, ensuring the fire detector units and wiring are intact (integrity of the detector systems). At the same time, the audible warning bell should operate, confirming the alarm sound is functioning so crew alarms can be heard. So the test confirms visual warnings, detector integrity, and audible annunciation—covering all aspects of the warning system. If any part doesn’t respond, it flags a fault in that portion of the fire warning system.