Private Pilot Licence · Practice

The 'critical altitude' of a turbocharged engine is the altitude:

• A.The altitude at which the engine stops producing any useful power due to lack of oxygen density
• B.The altitude at which the constant-speed propeller reaches the coarse pitch stop and overspeeds
• C.Above which the turbocharger can no longer maintain rated manifold pressure
• D.The altitude where airframe ice begins to form on the intercooler inlet restricting airflow