What does an aural warning fail amber CAS indicate?

• A. All aural warnings are functioning
• B. All aural warnings EXCEPT for terrain and TCAS are inhibited
• C. Critical system failure alert
• D. Non-essential warnings are silenced

Answer: (B)

The aural warning fail amber CAS indicates that while there is a failure in the aural warning system, the warnings for terrain and TCAS (Traffic Alert and Collision Avoidance System) remain active and are not inhibited. This situation ensures that critical safety information regarding terrain proximity and potential mid-air collisions is still communicated to the flight crew, even if other non-critical aural alerts may not be functioning properly.

This separation allows pilots to maintain awareness of significant threats while acknowledging that some less critical alerts may not be operational. Other options do not accurately capture this nuanced functionality of the system, as they either suggest full operational integrity of all warnings or do not specify the ongoing importance of the terrain and TCAS alerts.