SACAA ATPL Human Performance Practice Questions - SACAA Airline Transport Pilot Licence (Aeroplane) Human Performance & Limitations Examination Exam

78% Nitrogen, 21% Oxygen, 1% Argon and trace gases 50% Nitrogen, 50% Oxygen 78% Oxygen, 21% Nitrogen, 1% Carbon Dioxide 21% Nitrogen, 78% Oxygen, 1% Water Vapor