11.5 Instructor Questions Flashcards
What is the model for air pressure at sea level known as and what is its value?
A. (ISA) international standard pressure
B. 1013.25 hPa 15 degrees C
What does the Altimeter measure?
Barometric height
What is static pressure at sea level called?
QNH
What happens to static pressure as altitude increases?
It decreases
With aneroid bellows meter what is significant about small pressure changes at low level compared to high level?
It is less accurate a radio altimeter is used instead
What is dynamic pressure?
Total pressure - static pressure
In a pneumatic airspeed indicator what is the movement of bellows proportional to?
Changes in pressure
How does total pressure vary with speed?
Higher speed means higher total pressure lower speed means lower total pressure
What are the two names used for the temperature defined as, the temperature of the undisturbed air around the aircraft?
-static air temperature
-outside air temperature
What is the usual temperature indicated used in flight?
Total air temperature
Which temperature cannot be measured directly and must be calculated by the air data computer (ADC)?
Static temperature
With the temperature calculation used for static air temperature what effect must be taken into consideration for the correct figure to be calculated?
Ram air rise
What does a vertical speed indicator show?
Climb or descent in feet per minute
In a vertical speed indicator what pressure is used?
Static pressure
How is static pressure connected to a sealed case?
Calibrated metering unit
Where are static ports located?
In smooth air or out of relative airflow towards the front of the aircraft
What protective measures must be carried out with static ports?
Kept clean and dry
What is the difference between measured static and real pressure called?
Static source error
What does static source error depend on?
-fuselage shape
-airspeed
-flap/ landing gear position
-angle of attack
What condition influences measured static?
Side slip
How is side slips effect on static pressure compensated for?
Cross porting between the static ports on opposing sides
What is pitot pressure used for?
Air speed indicator
Which direction does the pitot probe point?
In the flow of air
What must you ensure about pitot probes leading edge?
That they are in good condition
