Oxygen Systems

How is oxygen provided in aircraft?

Pressurisation gives oxygen at the right pressure, supplementary oxygen for emergencies

What is diluter demand?

- Regulated gaseous oxygen

- Generally for crew

- Diluted with air below 34000ft

- Responds to inwards breath

- Prolongs supply

What are oxygen masks for pax like?

Simple flexible rubber

What are oxygen masks for crew like?

More fitting, can have microphone and headset as well, may also be a smoke mask

Who generally needs a walk around gaseous oxygen bottle and why?

Crew, in the cabin to help assist pax and perform other required duties

How can charged oxygen be stored?

- Liquid (LOX)

- Gas

What is continuous flow oxygen?

Chemical candle, gaseous for pax cabin providing automatic, immediate and continuous oxygen

What are the pros of the chemical candle?

- Lightweight

- Less equipment

- Less maintenance

What are the cons of the chemical candle?

- Higher fire hazard

- Not tamperproof

- Won't turn off

How are chemical candles started?

Mechanically by pulling down on string and releasing firing pin or electrically activated

Why is oxygen dangerous?

Supports combustion (fire hazard)

What can't you do when charging (with oxygen)?

- No pax on board

- No refuelling

- No power on

Why should you never fully deplete a gas bottle?

Atmospheric moisture can enter the bottle and cause internal corrosion