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164 - ATPL - In a cabin air conditioning system, equipped with a bootstrap, the mass air flow is routed via the:

Question 164 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

Turbine outlet of the cold air unit to the primary heat exchanger inlet.
Secondary heat exchanger outlet to the compressor inlet of the cold air unit.
Compressor outlet of the cold air unit to the primary heat exchanger inlet.
Secondary heat exchanger outlet to the turbine inlet of the cold air unit.

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