When does the amber CABIN ALTITUDE CAS occur?

• A. When cabin altitude exceeds 9,000 feet
• B. When cabin altitude exceeds 10,500 feet
• C. When cabin altitude exceeds 11,500 feet
• D. When cabin altitude exceeds 12,000 feet

Answer: (B)

Cabin altitude is the effective altitude inside the airplane, and keeping it within safe limits is essential to prevent hypoxia. The amber CABIN ALTITUDE CAS is a caution that lights when the cabin altitude climbs past a defined threshold, which in this aircraft is 10,500 feet. This early warning gives you time to check the pressurization system and take corrective action, such as adjusting the pressurization controller or descending to a lower altitude to restore cabin pressure. It’s amber because it’s a warning to monitor and respond, not an immediate emergency. If the cabin altitude continues to rise or the pressurization system fails, a more urgent indication would appear. When this alert occurs, verify the pressurization settings, check the outflow valve operation, and plan a descent to bring cabin altitude back to a safe level.