Which of the following is NOT a type of alert communicated by the Crew Alert System?

The Crew Alert System is designed to provide critical information about the aircraft's status to the flight crew, and it uses a color-coded alert system to differentiate the urgency of various alerts. Each alert type serves a specific purpose in conveying the level of attention or action required by the crew.

In this context, a cyan advisory typically indicates a system condition that is non-critical but still important for the crew to be aware of. However, it is actually classified differently within the Crew Alert System. The alerts are categorized primarily as master warnings (red), master cautions (yellow), and advisories which include specific color designations but typically do not include a cyan designation for advisories as a standard.

Therefore, the inclusion of "Cyan advisory - system condition" does not align with the conventional alerts recognized in the Crew Alert System, leading to the conclusion that this is not a type of alert used systematically in the aviation context outlined in this question. Thus, it is identified as the correct response to the question posed.