How can warnings from the master warning system be cancelled?

• A. Press the master warning/caution button
• B. Switch off the aircraft battery
• C. Toggle the avionics switch off
• D. Ignore and continue flight

Answer: (A)

When a master warning is triggered, you cancel it by acknowledging it with the master warning/caution button. Pressing this button clears the warning light and stops the audible alert, letting you focus on diagnosing and addressing the underlying fault according to the checklist. It doesn’t fix the problem by itself; it simply removes the immediate alert so you can proceed with the correct steps.

Switching off the aircraft battery isn’t an appropriate or safe way to cancel warnings, as it cuts power to essential systems. Turning off avionics might silence some displays but won’t reliably clear the warning or preserve critical information you need to manage the situation. Ignoring the warning and continuing flight is unsafe because the alert exists to draw attention to a condition that requires action.