If the cabin differential is measured at 6.2 PSID, which CAS message would be expected?

• A. Amber CABIN PRESSURE CAS
• B. Red CABIN PRESSURE CAS
• C. Amber CABIN ALTITUDE CAS
• D. No CAS would appear

Answer: (A)

Cabin differential pressure is monitored by the cabin pressurization alerting system. When the differential pressure falls outside the normal operating range, the CAS annunciates a cabin pressure message. The amber color signals a caution condition—it's above normal limits but not an immediate, fully critical fault. A reading of 6.2 PSID is higher than the normal operating range, so you would get an amber CABIN PRESSURE CAS to alert you to reduce differential or investigate the pressurization system. A red cabin pressure CAS would indicate a more severe fault or dangerous overpressure that requires immediate action, which is not indicated by this scenario. The other possibilities don’t match the situation: it isn’t about altitude directly (that would be a cabin altitude CAS) and it isn’t a no-alert condition since the differential is out of range.