What accompanies warning messages indicating immediate action is required?

Warning messages that indicate immediate action is required are typically accompanied by both audible alerts and visual indicators. The purpose of these alerts is to ensure that the pilot or operator notices the critical information without delay, thus enabling a prompt response to potential issues.

Audible alerts are essential as they can quickly grab the attention of the pilot, especially in situations where visual monitoring may be compromised due to workload or distractions. Visual indicators, such as flashing lights or message displays, further reinforce the urgency of the warning and provide critical information about the nature of the issue.

Other options, while they may contribute to overall situational awareness or indicate normal operating conditions, do not serve the same immediate urgency as the combination of audible and visual alerts. Green lights, for example, usually signal that systems are operating normally and do not indicate a warning. Similarly, vibration in the control yoke could be a response to a different kind of system input, and calibration reset prompts are more about maintenance and setup rather than immediate operational alerts.