SACAA ATPL Instruments Practice Questions - SACAA Airline Transport Pilot Licence (Aeroplane) Instruments & Electronics Examination Exam

Cockpit pressure is usually lower than ambient due to airflow over the fuselage; altimeter reads high, ASI reads high, VSI momentary climb spike. Cockpit pressure is usually higher than ambient; altimeter reads low, ASI reads low, VSI momentary descent spike. Cockpit pressure is equal to ambient; no errors occur on altimeter or ASI, but VSI displays reverse indication. Cockpit pressure is lower than ambient; altimeter reads low, ASI reads low, VSI reads zero.