AW 119 ATA 21 - ENVIRONMENTAL CONTROL

What is the primary source of air for the cabin ventilation and windshield defogging system?. Hot air bled from the engine compressor. An air scoop located in front of the main gearbox. A ram air intake on the lower forward fuselage. The air conditioning unit running in blower mode.

What is the function of the VENT knob located on the front console?. It controls the speed of the ventilation fan. It opens a gate valve in the air mixing box to allow ram air into the cabin. It regulates the airflow from the passenger upper air intake. It adjusts the temperature of the air coming from the diffusers.

The cabin heating system warms the cockpit and cabin by using: A dedicated electrical heating unit. Hot air bled from the engine compressor, mixed with fresh ambient air. The air conditioning's freon-based cooling unit running in reverse. Recirculated cabin air that is heated as it passes the main gearbox.

What safety feature interrupts the heating system if the blended air temperature exceeds 127 ∘C?. A caution message appears, but the system continues to operate. The mixing valve automatically returns to the full cold position. An overtemperature switch automatically interrupts the system's operation. The engine bleed air shut-off valve must be manually closed by the pilot.

In the heating system, what is the specific function of the S/OFF switch?. It energizes the main electrical circuit for the entire heater system. It controls the solenoid that operates the mixing valve. It controls the shut-off valve on the engine bleed air duct. It adjusts the final temperature of the heated air.

The air conditioning (A/C) system relies on which component being driven by a belt from the Main Gearbox (MGB) fan cooling drive shaft?. The condenser fan. The aft evaporator blower. The compressor. The ventilation fan.

When the Air Conditioning system is set to BLOWER mode instead of A/C mode, what is the status of the compressor and the upper air intake?. The compressor clutch is engaged, and the upper air intake is closed. The compressor clutch is disengaged, and the upper air intake remains closed. The compressor clutch is engaged, and the upper air intake is open. The compressor clutch is disengaged, and the upper air intake opens.

How is the airflow for the separate passenger compartment upper air outlets generated?. It is driven by the main electrical ventilation fan. It is supplied by the aft evaporator blower from the A/C system. It depends entirely on wind velocity or the aircraft's airspeed through an air scoop. It is a secondary branch of the engine bleed air heating system.

The cooling system is protected from operating in ambient temperatures below 10 ∘C and from refrigerant loss by what component?. An evaporator freeze switch. The receiver-drier bottle. A pressure switch. The temperature controller circuit board.

. Under what condition does the ECS ON advisory message appear on the PFD or EDU?. When the system is operating in BLOWER mode only. When the system is operating in A/C (cooling) mode only. Whenever the evaporator blowers are turned on, regardless of the mode. When the TEMP CONT knob is adjusted.