Which component comes last in the PACK air flow path?

Which component comes last in the PACK air flow path?

• A. Turbine
• B. PreCooler
• C. Heat Exchanger (Primary)
• D. Condenser

Answer: (A)

In the PACK air flow path, cooling is achieved by passing bleed air through a sequence of heat exchangers and a turbine that expands the air to lower its temperature. The PreCooler starts the cooling by using ram air to drop the air’s temperature, followed by the Primary Heat Exchanger to remove more heat. The Condenser then rejects heat to the outside, preparing the air for expansion. The last PACK component the air goes through is the turbine, where it expands and its temperature drops further, producing the very cold air used for cabin supply. After exiting the turbine, the conditioned air is directed to the cabin.

In the PACK air flow path, cooling is achieved by passing bleed air through a sequence of heat exchangers and a turbine that expands the air to lower its temperature. The PreCooler starts the cooling by using ram air to drop the air’s temperature, followed by the Primary Heat Exchanger to remove more heat. The Condenser then rejects heat to the outside, preparing the air for expansion. The last PACK component the air goes through is the turbine, where it expands and its temperature drops further, producing the very cold air used for cabin supply. After exiting the turbine, the conditioned air is directed to the cabin.