13.17 Oxygen Flashcards
In aircraft to be operated at flight altitudes at which atmospheric pressure in personnel compartments will be less than 700 hPa, what is the ICAO regulation regarding what is required before flight can commence?
30 minutes at 700 – 620 hPa – Sufficient stored breathing oxygen is carried to supply all crew members and 10% of the passengers
Less than 620 hPa – Sufficient for all crew and passengers
In pressurised aircraft, intended to be operated at flight altitudes at which the atmospheric pressure is less than 376 hPa, by what value must the total number of oxygen dispensing units exceed the number of passenger and cabin crew seat?
At least 10%
What does the capability to descent dependent on?
Minimum Sector Altitude (MSA)
What is Minimum Sector Altitude determined by?
Terrain
With regards to CAA requirements, what is the provision required of first aid oxygen supply?
Must be sufficient to supply simultaneously 2% or 2 passengers, whichever is greater, wherever they are seated
At what heights would you use the following regulator restrictors in a continuous flow oxygen system:
Red
Orange
Green
Red – 8,000 to 14,000 feet
Orange – 14,000 to 22,000 feet
Green – 22,000 to 25,000 feet
Where an oxygen system utilises a manual shut off valve, when must it be ensured that it is open?
Before flight
How often are disposable masks to be used (passenger masks)?
Once only
How is it indicated that oxygen is flowing in a disposable mask?
Flow indicator shows red for no flow and green for flow
What must quick–don masks demonstrate?
Ability to be donned with one hand in 5 seconds or less
Accommodate prescription glasses
In a gaseous oxygen system, the crew and passenger oxygen systems are normally independent of each other, except in what two locations?
Common charging point
Overpressure relief facility
How will British oxygen cylinders appear?
Black with a white top hemispherical portion
How will American oxygen cylinders appear?
Green
What should be done with the oxygen cylinder manual shut off valve when a cylinder is refitted?
Wire locked open
When will the green bursting disc allow oxygen to escape to the outside of the aircraft?
Cylinder pressure rise to approximately 2800 psi
What will indicate oxygen system overpressure?
Green indicator disc has been blown out exposing red interior of the discharge fitting
or
Orange streamers released from the indicator disc
How are the supply pipes in the oxygen high pressure system identified?
Green band with the words BREATHING OXYGEN and black rectangle on a white background