11.16 Flashcards
What is powered by a vacuum system?
Gyroscopic instruments
What is a low pressure system used for?
1-10 psi
Anti icing on the leading edge
What is the psi and use of medium pressure?
50-150 psi
Draws air from the compressor section of a turbine engine
What is the psi and high pressure systems uses?
1000-3000 psi
It’s stored in metal bottles depending on systems
The bottles have two valves
What are the three ports on an engine bleed air system depending on engine types?
Low On twin shaft engines
Intermediate triple shaft engines
High pressure bleed port
When is bleed air taken from the APU?
When it’s running above 95%
What are the two actuated devices on a n apu?
-inlet guide vanes which regulates airflow to the load compressor
-surge control valve which maintains sustainable surge free air supply
What is the function of the pressure relief valve and its design?
Prevents damage
Pressure limiting units
A spring holds valve in closed position
A force on the ball opens it
How many ports at any given time can be taken from at any point on an engine?
One
What regulates bleed air temp?
Pre cooler
What will happen if the pressure relief valve fails?
The outpressure valve closes and bleed air is cut
What is the dry pump vanes and rotor made from to eliminate the need for oil?
Carbon
How are wet pumps lubricated?
Through the engines low pressure oil system
What is the purpose of the fan air valve?
Cooling
What should be indicated to the cockpit in terms of bleed air pressure?
Valve position
Temperature
Pressure
Whether the ground is in use
