Lecture 2 - Air Conditioning and Pressurisation - Part 1

Summary:

Instructor and Student discussed scheduling a meeting that works for both of them. They also covered the different uses of air in aircraft, including air conditioning, pressurization, ventilation, and icing, and how they are achieved through the air conditioning system. Instructor provided a detailed explanation of the pack wall and its operation, including its electronic and pneumatic controls and how it shuts off and controls flow levels. They also discussed the various cooling functions, including ground turbofans, ram air, and recirculation fans, and how they assist the pack in cooling the cabin.

Instructor went on to explain the bleed system, including how it works and the various conditions under which the bleed wall will close automatically. They also provided a detailed explanation of the various components of the pack system, including the primary and secondary heat exchangers, compressor, condenser, water extractor, turbine, and temperature control. Instructor gave a thorough overview of the aircraft's ventilation system, including the recirculation and extraction of air from different compartments.

Instructor and Student also discussed the importance of being careful when opening the overboard wall due to the potential discomfort or harm caused by sudden changes in pressure. They had a detailed conversation about the exhaust mode and overboard wall, covering topics such as their purpose, indications, and faults. They also discussed the delay in pack start-up when starting engine number two and the workings of the cabin pressure control system in great detail, covering topics such as the location and operation of the outflow walls, the electro-pneumatic and pneumatic control subsystems, and the different modes of operation. Finally, Instructor provided a detailed explanation of the air part, pressurization, ventilation, and air conditioning, and how the cabin altitude is maintained during landing.

Chapters & Topics:

Scheduling a Meeting:

  • Scheduling a meeting time that works for both parties
  • Air Conditioning System Overview:
  • Uses of air in aircraft
  • Explanation of Pack Wall and Cooling Function
  • Bleed System and Non-Returning Wall
  • Explanation of how the pack works:
  • How the pack works
  • Ventilation and Extract Fan Functionality
  • Understanding the Effects of Differential Pressure on Overboard Wall:
  • Differential pressure and its impact on opening the overboard wall
  • Discussion on Exhaust Mode and Overboard Wall
  • Delay in Pack Start-up
  • Cabin Pressure Control System
  • Air Part, Pressurization, Ventilation, and Air Conditioning:
  • Air part, pressurization, ventilation, air conditioning, and icing

Action Items:

  • Student will send a text via Whatsapp to Instructor to provide the specific timing when they will be available for meetings.
  • Student will inform Instructor about their work shift after starting their new job on Monday.
  • Student will research and provide information on the uses of air in aircraft, specifically focusing on air conditioning, pressurization, ventilation, and icing systems.
  • Instructor will provide a detailed schematic of the air conditioning system for further discussion and analysis.
  • Student will research and learn about the non-returning wall (Nr V) and its purpose.
  • Student will research and learn about the latest standard three aircraft's provision for better cooling.
  • Student will investigate and demonstrate the location of the small hole near the oxygen bottle indicator to Instructor.
  • Student will ensure that the overall wall is fully open when the engine one is not running.
  • Instructor will reset the exhaust mode push button if there is a smoke indication during the smoke test.

Key Questions:

  • What are Student's work hours and schedule like at the new job?
  • What are the uses of air in aircraft?
  • How does the pack wall operate and what is its control mechanism?
  • How does the air cooling and distribution function work in the cabin, and what is the role of the recirculation fan?
  • What happens if the differential pressure




Complete and Continue