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Questions and Answers
What is the primary function of the overpressure knob in the oxygen system?
What is the primary function of the overpressure knob in the oxygen system?
- To test the microphone by listening to oxygen flow
- To switch between air/oxygen mixture and pure oxygen
- To adjust the cabin pressure for altitude changes
- To allow pure oxygen to flow continuously without demand (correct)
At what altitude will the user automatically receive pure oxygen instead of an air/oxygen mixture?
At what altitude will the user automatically receive pure oxygen instead of an air/oxygen mixture?
- Above 20000 feet
- Above 25000 feet
- Above 35000 feet (correct)
- Above 40000 feet
What is a potential discomfort associated with using the emergency overpressure function?
What is a potential discomfort associated with using the emergency overpressure function?
- Inhalation of noxious gasses
- Inability to receive oxygen on demand
- Overheating of the oxygen mask
- Difficulty breathing while exhaling (correct)
Which position of the overpressure knob is used for testing the microphone?
Which position of the overpressure knob is used for testing the microphone?
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What happens when the 100% oxygen selector is moved to 100%?
What happens when the 100% oxygen selector is moved to 100%?
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Study Notes
Oxygen Delivery Modes
- Normal Mode:
- Delivers an air/oxygen mixture on demand below 35,000 feet.
- Provides pure oxygen above 35,000 feet.
- 100% Selector:
- When activated, delivers pure oxygen on demand, regardless of altitude.
- Emergency Function (Overpressure Knob):
- Controlled by a push and turn knob.
- Allows constant oxygen flow, not just on demand.
- Pushed Position: Momentarily provides overpressure for clearing the mask and testing the microphone.
- Turned Position:
- Provides continuous overpressure.
- Used at very high altitudes to prevent inhaling smoke and noxious gases.
Breathing Considerations
- Breathing out can be uncomfortable in the emergency mode.
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