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576 - ATPL - In a piston engine if the ratio of air to fuel, by weight, is approximately 9:1, the mixture is said to be:

Question 576 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

Too weak to support combustion
Weak
Normal
Rich

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