Which statement best describes the role of an inertial switch in an ELT?

Which statement best describes the role of an inertial switch in an ELT?

• A. It triggers activation when the aircraft experiences a prescribed force
• B. It triggers activation only by manual command
• C. It monitors altitude
• D. It controls GPS data emission

Answer: (A)

An inertial switch in an ELT is a crash-detection device that automatically activates the beacon when the aircraft experiences a sudden deceleration or impact. It acts as a g-switch: once the forces exceed a preset threshold, it closes the circuit and powers or triggers the ELT, ensuring distress signals are sent even if the crew cannot or does not manually activate it. This automatic behavior helps prevent false activations during ordinary flight and keeps the transmitter silent until a crash event occurs. It’s not about triggering on manual command, so it won’t activate just because someone presses a button. It also doesn’t monitor altitude, and it doesn’t control when GPS data is emitted—those functions are handled by other parts of the beacon system and its related navigation/genesis features.

An inertial switch in an ELT is a crash-detection device that automatically activates the beacon when the aircraft experiences a sudden deceleration or impact. It acts as a g-switch: once the forces exceed a preset threshold, it closes the circuit and powers or triggers the ELT, ensuring distress signals are sent even if the crew cannot or does not manually activate it. This automatic behavior helps prevent false activations during ordinary flight and keeps the transmitter silent until a crash event occurs.

It’s not about triggering on manual command, so it won’t activate just because someone presses a button. It also doesn’t monitor altitude, and it doesn’t control when GPS data is emitted—those functions are handled by other parts of the beacon system and its related navigation/genesis features.