Oxygen Systems Flashcards
In the cabin, when the oxygen mask is pulled downwards, the passenger breathes :
a mixture of oxygen and cabin air.
If needed, must the cargo hold be able to be pressurised?
Yes
The maximum allowable cabin altitude at the aircraft’s cruising altitude is?
8 000ft
The cabin sink rate limit is -
300fpm
The cabin climb rate is -
500fpm
For providing pressurisation in reciprocating aeroplanes, the simplest method, all though it has a lot of disadvantages, is drawing compressed air from -
A more acceptable method of providing pressurisation is through independent cabin compressors, which are usually either:
the turbocharger or the supercharger
- a centrifugal compressor
- a positive displacement type of compressor, of which the roots-type blower is the most popular.
If the aircraft is turbine powered, pressurisation is achieved by using -
compressor bleed air
The maximum altitude at which an aeroplane may operate is determined by -
the differential pressure
Positive differential describes a condition in which -
cabin pressure is higher than ambient pressure
Negative differential describes a condition in which
cabin pressure is lower than ambient pressure
The pressurising source, be it a compressor or bleeds, will provide much more air than is generally required. The method of control is through -
an outflow valve
The outflow valve is automatically operated once -
But may also be -
limiting condition are reached
Manually operated
Which type of cabin air pressure valve?
This prevents cabin pressure from exceeding a predetermined differential pressure above ambient, ie cabin pressure is reduced to prevent the fuselage from exploding
Pressure relief valve
Which type of cabin air pressure valve?
This prevents the ambient pressure from exceeding the cabin pressure, ie cabin pressure is increased to prevent the fuselage from collapsing
Vacuum relief valve
The system which in most aeroplanes is provided only to flight crew, and is independent of the cabin system?
Diluter Demand System
The diluter demand oxygen is stored -
In high pressure cylinders
Below 32 000ft, to conserve oxygen, the oxygen of the diluter demand system is -
mixed with cabin ambient air
relevant to the diluter demand system, the “emergency” mode serves to?
supply 100% oxygen from the cylinders, thus no cabin air is inhaled.
The chemical, or solid state oxygen system can produce oxygen for -
15 minutes
The life of an oxygen cylinder is usually -
5 years
A substance which may never be used in the vicinity or on parts of an oxygen installation is :
grease
The state in which the breathing oxygen for the cockpit of jet transport aeroplanes is stored is :
Gaseous.
The purpose of the “Pressure Relief Valve” in a high pressure oxygen system is to :
relieve overpressure if the pressure reducing valve malfunctions
