What is the ISA temperature and air pressure?
Temp - 15 degrees C
Air - 1013.25 hector pascal
In the event of a cabin depressurisation at 10,000 feet, what can humans do to help feed the brain of oxygen?
Breath at a faster rate.
At what altitude will rapid decompression happen in 15 seconds?
40,000 feet.
What is the most commonly used oxygen bottle in aviation?
Aviators oxygen.
Very dry source of oxygen.
In a crew oxygen system, what will be attached in order to control the flow of oxygen delivered to the distribution components?
Pressure regulator
In a crew oxygen system, what is the system called in which will allow the user to control the flow of oxygen delivered to the mask?
Diluter demand.
How can we test an oxygen mask storage hold?
Press the lever and check if any oxygen flows via a dial.
When the lever is up ‘OXY ON’ will show.
Rest by pushing lever down.
In an oxygen mask storage unit, what will allow the microphone to be used when the oxygen mask is attached in use?
A pressure switch connected to the supply valve.
Which mode on an oxygen mask will allow the supply of 100% oxygen to the user?
100% oxygen on the diluter demand.
Typically how long does it take for the application of an oxygen mask?
5 seconds.
What altitude is the cabin pressurised to during flight?
8000 ft
In the overhead section of passenger seating, how many mask will there be in number to the seats?
Always one more than the number of seats in the section if parents are holding children.
When passenger masks drop, if the automatic system fails how can the pilot release the masks?
Manual override.
How long will an activated oxygen generator generate oxygen for?
12 to 15 minutes.
What are the two methods of supplying passenger oxygen?
Gaseous
Chemical
In order to begin the supply of oxygen to the passenger masks, what must be done?
A lanyard is pulled to remove a pin which will begin the delivery of oxygen.
What is oxygen usually stored in?
A dark green bottle
Made of steel alloy or Kevlar.
At 21 degrees C, what is the max capacity of oxygen?
3200L
How much pressure should an oxygen bottle typically have?
1850 PSI
In the event of an oxygen bottle over pressure, what safety device will prevent explosion?
Safety disk in which will bust on overpressure at around 2600PSI
What device will stop oxygen going into the storage area on re fill?
Safety outlet.
How many bottles can be connected to the same discharge line?
10 bottles.
On refilling oxygen systems, what pressure must you NOT refill?
Below 50 PSI on the gauge. Pressure below this can begin to contaminate.
If on a thermal compensator the B-nut is disconnected, what must be done?
The whole unit must be replaced.
Airbus and Boeing have different numbers of stages for pressure regulation. What are these?
Airbus 1 step.
Boeing 2 step. - intermediate to unusable pressure.
What two locations can portable oxygen systems be stored in?
Cockpit or next to passenger exits.
If a smoke hood storage box indicator reacts to humidity in the air and the colour changes what precautions should be taken?
The smoke hood must be replaced.
Smoke hoods are vacuum packed
What is the purpose of a smoke hood?
To prevent the inhalation of fumes.