What TCAS/ACAS configuration is required for aircraft with 10 to 30 passenger seats operating in the USA?

• A. TCAS/ACAS 1
• B. TCAS/ACAS II
• C. TCAS/ACAS III
• D. TCAS/ACAS IV

Answer: (A)

For smaller passenger-c carrying aircraft in the United States, the appropriate TCAS/ACAS configuration is the basic, traffic-advisory version. TCAS I (ACAS I) provides Traffic Advisories to help the crew situationally, but it does not issue the maneuvering advisories that tell you exactly how to avoid another plane. Larger transport-category aircraft and many business jets typically use TCAS II, which can generate resolution advisories to actively guide avoidance.

The reason this is the best fit for 10 to 30 seats is that regulations and typical certification practices reserve the more capable TCAS II (with RA capability) for larger, higher-risk operations, while smaller passenger aircraft are covered by the simpler TCAS I to meet collision-avoidance needs without the added complexity, cost, and potential cockpit workload of RA guidance.