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Questions and Answers
What is the primary purpose of the extraction fan in aircraft lavatories and galleys?
What is the primary purpose of the extraction fan in aircraft lavatories and galleys?
- To circulate air throughout the cabin
- To cool the air in the cabin
- To remove smelly, hot, and wet air (correct)
- To provide fresh air to the passengers
When does the extraction fan in the lavatory switch off?
When does the extraction fan in the lavatory switch off?
- When enough differential pressure is present (correct)
- When the aircraft is at cruising altitude
- When the lavatory is not in use
- When fresh air supply is insufficient
How does cabin air enter the lavatory?
How does cabin air enter the lavatory?
- Through a grill in the door (correct)
- Via the duct in the ceiling
- Through the outflow valve
- From the galley area
What feature might aircraft have to ensure continued ventilation in case of fan failure?
What feature might aircraft have to ensure continued ventilation in case of fan failure?
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Where does the fresh conditioned air for the lavatories come from?
Where does the fresh conditioned air for the lavatories come from?
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Study Notes
Air Ventilation System
- Air from lavatories and galleys is removed due to potential odors, high temperature, and humidity.
- A ventilation system with ducts and extraction fans removes this air.
- The extraction fan pushes the air towards the outflow valve.
- The fan operates continuously with available electrical power or shuts off when sufficient differential pressure is present to move the air.
- A backup fan is available in case the primary fan fails.
- In lavatories, cabin air enters through a door grill and is extracted through a ceiling duct.
- A small amount of fresh, conditioned air enters through a separate duct from the cabin distribution system.
- Galleys are ventilated using the same system.
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