What occurs when the landing gear TEST button is depressed?

When the landing gear TEST button is depressed, all warning lights and alerts activate. This functionality is designed to verify the integrity of the landing gear warning system. Pressing the TEST button ensures that pilots can confirm that all warning indicators are operational and functioning correctly before takeoff.

The activation of all alerts provides a complete system check, which is critical for maintaining safety. By lighting up all warning lights and sounds during this test, pilots can be assured that if there were any malfunctions or if the landing gear was not in the correct position during landing, the appropriate warnings would activate, alerting the crew.

Understanding this procedure is essential for pilots, as it highlights the importance of pre-flight checks and system verification, ensuring the aircraft's safety systems are ready for operation.