11.15 oxygen Flashcards
the cabin pressurisation system ensure the cabin altitude doesnt exceed what
8000ft
what does air consist of
78% nitrogen, 21% oxygen, 1% other
as altitude increases what happen to air pressure
air pressure decreases
at sea level what is the oxygen pressure in the lungs
19.6 hPa
how do we overcome the negative effects of atmospheric pressure in flight
increase oxygen pressure, increase quantity of oxygen
what colour are the cylinders painted that stores oxygen
green
whats the only type of oxygen suitable for aircraft use
aviators breathing oxygen
why is aviators breathing oxygen used on aircraft
its very dry
why is medical oxygen not use don aircraft
it contains water droplets that will freeze
what are oxygens characteristics
colourless, odourless, non-inflammable gas
smoking is not permitted in what distance of oxygen working areas
15m
what oxygen systems are used in the flight deck and by the flight crew
diluter demand and pressure demand flow systems
what pressure are the high pressure oxygen bottles in the flight deck
1850 psi
when is cabin oxygen used
only if the cabin depressurises
when does the oxygen system in the cabin automatically activate
exceeds 14,000ft
what must oxygen be kept away from
oils, greases, flames
whats a SOV on an oxygen bottle
shut off valve
what pressure safety device do oxygen bottles have
disc that breaks over a certain pressure
whilst refilling bottles what is there a danger of
heat concentration
how is oxygen transported to the flight deck
through lines and manifolds
what 5 types of valve are found in high pressure oxygen systems
filler valve, check valve, shut off valve, pressure reducer valve, pressure relief valve
what are oxygen shut of valves designed to open
slowly
what is the use for the portable oxygen bottles
emergency or first aid use
what 2 types of masks can be used with the portable oxygen
full face mask, continuous flow mask
when are smoke hoods used
when fighting a fire or preventing breathing in smoke
when must a oxygen cylinder not be refilled and why
if the psi is below 50, moisture may have entered the bottle
what is used for leak testing oxygen systems
soapy leak check fluid
what are the different regulators called that dispense the oxygen
continuous flow, demand flow
whats the difference between demand and continuous oxygen masks
demand only releases oxygen on the inhale, continuous releases oxygen forever even on the exhale
what does a diluter-demand type regulator do
holds oxygen until the user inhales
what aircraft use pressure demand regulators for continuous flow oxygen
aircraft that fly above 40,000 ft
how long will it take flight crew to put on the full face mask with one hand
less than 5 seconds
in the oxygen release system what do vent holes allow
oxygen to mix with the cabin air
what are the 2 ways oxygen is supplied to the cabin mask system
chemical or gaseous
what are the primary cabin mask chemical oxygen systems
portable type, fully integrated type
what is the EOC
emergency oxygen container
what is OBOGS
on board oxygen generating system
what aircraft is OBOGS usually used on
military aircraft
what is a FCU
flow control unit
where are oxygen system blowout discs located
fuselage skin
what do flow indicators provide
indication that oxygen systems are working
