M11.15 Flashcards
What is the international standard atmosphere temperature?
15°c
What is the international standard atmosphere air pressure?
1013.25 hectopascals
Air consist of what percentages?
- 78% nitrogen
- 21% oxygen
- 1% inert gases
What type of oxygen is used in aircraft?
Aviators oxygen
What are oxygen cyclinders made from?
Steel alloy or composites
What pressure is oxygen stored at?
1850psi
What is the maximum capacity of a oxygen cylinder?
3,200 litres
What does oxygen pressure vary with?
Temperature
When will the safety disk break on an oxygen cylinder?
2,600psi
What indicates if there has been a oxygen cylinder over pressure?
The green disk will have broken
At what pressure should oxygen bottles not be refilled and why?
50 psi because moisture has entered
Where would you find the oxygen pressure in the flight deck?
On the doors/oxygen page on the ECAM
What does it mean when the flow indicator is blinking on the oxygen stowage box?
Oxygen is flowing
What are the two red grips used for on the oxygen face mask?
To inflate and deflate with oxygen to give a tight fit
What are the three modes of the diluter demand regulator for oxygen masks?
- normal
- 100% oxygen
- emergency
What happens in the normal mode from the diluter demand regulator?
It gives a mixture of air and oxygen up to 35,000 feet
What happens in the 100% oxygen mode from the diluter demand regulator?
The user receives 100% oxygen
What happens in the emergency mode from the diluter demand regulator?
The masks gives constant oxygen flowing (breathing out becomes uncomfortable)
What altitude does the oxygen masks deploy when there is a depressurisation?
14,000ft
Where are oxygen masks located?
At every seat, lavatory, and attendant station
Why is there always more masks than seats in a row?
Just in case of there being a child
What happens if the oxygen masks fail to deploy?
There is a manual switch in the flight deck
What are the two ways that oxygen is supplied to the system?
- chemical system
- gaseous system
When oxygen masks drop they do not supply oxygen straight away, Why is this?
Because the user must pull the lanyard to break the pin on the oxygen generator
What are the oxygen generators filled with?
Sodium chlorate and iron powder
How is oxygen generated in a the oxygen masks?
It mixes sodium chlorate and iron powder which consumes less oxygen than created
What is used to absorb the left over chlorine from the oxygen generators?
Barium peroxide (BaO2)
How long does the oxygen generators supply oxygen for?
12-15minutes
What is used in the gaseous system?
Oxygen bottles
When are smoke hoods used?
When fighting fires or to prevent breathing in smoke or noxious gases
