In the event of a manifold failure, what indication will be present?

When a manifold failure occurs, the correct indication involves a CAWS (Centralized Aural Warning System) attention sound along with an aural message stating "MANIFOLD FAIL." This alerts the crew to the specific issue that has arisen, providing both an auditory cue and a clear message regarding the nature of the failure. The combination of the sound and the precise message ensures that the flight crew is immediately informed of the problem, allowing them to take appropriate and timely action to address the situation. The CAWS system is designed to prioritize critical alerts, which enhances situational awareness in response to failures.

The focus on clear communication is vital in aviation safety, making this option the most effective in conveying the necessary information during an emergency scenario.