B777 Air Conditioning

What does ATA 21 refer to ?

• Avionics Systems

• Airframe Structure

• Air Conditioning and Pressurization

• Landing Gear

Which component is responsible for cooling the bleed air in the air conditioning system ?

• Heat Exchanger

• Air Cycle Machine (ACM)

• Compressor

• Bleed Air Valve

Which one of the following is not the source of bleed air for the air conditioning system?

• APU (Auxiliary Power Unit)
  

• Engine
  

• Ram Air Turbine (RAT)
  

• Ground Power Unit (GPU electrical)

What role does the pressurization system play ?

• Cooling the cabin air
  

• Regulating cabin pressure

• Controlling aircraft altitude
  

• Providing fresh air to the cabin

In the Air Conditioning and Pressurization system, what does the term "bleed air" refer to?

• Air used for pressurizing the cabin
  

• Air taken from the cabin for cooling
  

• High-pressure air from the engines or apu
  

• Air released during emergency descent

What is the purpose of the air cycle machine (ACM) in the Air Conditioning system of the Boeing 777-200?

• Generates electrical power
  

• Cools the cabin air
  

• Pressurizes the cabin
  

• Controls aircraft altitude

Which part of the aircraft is responsible for releasing excess cabin pressure in emergency situations?

• out flow valve
  

• cabin temp controller
  

• Emergency Oxygen Masks
  

• Bleed Air Valve

What role does the Recirculation Fan play in the air conditioning system ?

• Filters bleed air
  

• Distributes used and filtered air to the cabin
  

• Regulates cabin pressure
  

• Controls engine bleed air

What safety precautions should be observed when accessing the air conditioning compartment for maintenance purposes?

• Use of personal protective equipment
  

• Manual pressurization of the compartment
  

• Activation of emergency oxygen masks
  

• Disconnecting the aircraft's power supply

In the event of a trim air valve malfunction, how might it impact the pressurization system?

• Loss of bleed air
  

• Inability to control cabin temperature
  

• Limited impact on pressurization
  

• Rapid loss of cabin pressure