11.16 Flashcards
How is the temperature of the air in the pneumatic system regulated?
By varying the amount of fan air passing through the pre cooler.
Example sentence: The temperature of the air in the pneumatic system is regulated by adjusting the fan air passing through the pre cooler.
What is the source of cooling air for the pneumatic pre cooler?
Engine fan air.
No additional information.
Under normal conditions how is the pneumatic system bleed valve operated?
By a switch on the flight deck.
No additional information.
Which type of valve is a pneumatic bleed valve?
Electrically signalled and pneumatically activated.
No additional information.
How is the pneumatic system pressure controlled?
By the bleed valve.
No additional information.
If the precooler inlet temperature becomes too high which actions does the system take?
The bleed valve closes.
No additional information.
Some bleed valves allow reverse flow of air through the valve when would this occur?
During engine start.
No additional information.
Which statement is correct regarding the operation of the pneumatic cross bleed valve if all pneumatic services are required?
The valve is closed in normal operations and open during APU or single engine operation.
No additional information.
What systems may be used to drive gyroscopic instruments?
Pneumatic.
No additional information.
Where does the vacuum system source its air?
Ambient.
No additional information.
Where is air released after the vacuum system has utilised it?
Released at source.
No additional information.
Which of the following might use the vacuum system?
Gyroscopes.
No additional information.
