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589 - ATPL - The power output of a normally aspirated piston engine increases with increasing altitude at constant Manifold Air Pressure (MAP) and RPM because of the:

Question 589 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

Lower friction losses.
Lower losses during the gas change.
Leaner mixture at higher altitudes.
Lower back pressure.

Training tests and timed exam simulations ATPL - Airline Transport Pilot license