Oxygen

Question 1

LARGE A/C HAEV TO INDEPENDENT OXG

Answer 1

~ ONE FOR CREW (USING BOTTLE COMPRESSED O2)
~ONE FOR THE PASSENGER CABIN (USING CHEMICAL O2)

In addion portable oxg cylinders are located
2% for passenger and min of 2 units

Answer 2

2hours of supply for crew

16/20 min for pax but requirment is only 10min

Answer 3

Passenger oxg masks must be capable of being automatically deployed before the cabin altitude exceeds 15000ft

Question 4

Crew oxg supllies

Gaseous oxg

Answer 4

Oxg is stored at 1800psi
Reduced to 80 -100psi for distribution
Reduce to 8 to 10 psi at each crew mask

Question 5

Flight crew mask

Answer 5

Diluter regulator
~normal mxiture of 02 and air
~proportiona O2 increases with altitude autmatically

100%oxg
~at 32000ft mask is 100% o2
~100% switch bypasses mixer unit
~emergency: 100% oxg supllied at postive pressure to prevent inwards leakage of cabin air

Question 6

Chemical oxg generator

Answer 6

The number of masks, are the number of seating +10%
~contains mix of sodium chlorate and iron powder
~pulling the lanyard fires the mechanism and ignites
~chemical genrators can supply up to 6 masks

Question 7

Pulse ox system

Answer 7

Like on a350

There is a bottle for 4 seats

Question 8

Small a/c pax emergency oxg

Answer 8

~normally use a central supply of gaseous oxg fro crew and passengers
~tables in the flight manula allow the crwe to clauclte the duration

Question 9

Portable oxg (crew)

Answer 9

~storage 1800psi
~capacity 120litres

The equipment allows two flow settings
~normal&raquo_space;a flow of two litres per minute, duration60min
~high&raquo_space;a flow of four litres per minute ,duration 30min

Question 10

Personal smoke protection

Answer 10

~smoke hood device similar to a gas mask
~intended to protect victims of fire from the effects of smoke inhalation

Eu regulation»
~flight crew use smoke goggles in conjuction with their oxg masks
~filtration occurs twice: once inhalation and then agin on exhalation

Answer 11

Oxygen doesnt burn but it does vigorously intensify any fire

Question 12

Oxg sys precaution

Answer 12

~oxg storage moisture content
~oxg must be as dry as possibile
~moisture may cause valves to freeze and could also lead to corrosion

~oxg sys labelling
~aviation oxg bottles are panted either
Black with a white neck
Or
Green and stamped with letter AVO2 to signify it is fit for aviation use

Other standard do not meet requires aviation standards

Question 13

Pros and cons

Answer 13

CHEMICAL
~ SMALL AND LIGHT TO STORE
~ONCE IT IS TRIGGERED CAN NOT BE TURNED OFF

GASEOUS:
~ABLE TO TURN ON AND OFF
~EASILY DILUTED WITH CABIN AIR
~HAVY TO STORE AND CARRY