Pitot static systems Flashcards
What is atmospheric pressure?
The force exerted by the weight of a column of air
What is standard sea level pressure in inches of mercury
29.92
What is standard sea level temperature in decrees Celsius?
15 C
What is the standard temperature lapse rate with altitude?
2 degrees C pr 1000’
A change in 1 inch of mercury pressure is equal to approximately ________ feet of altitude.
1000’
Define impact pressure
Static pressure plus dynamic pressure
Define static pressure
Ambient pressure
Which instruments depend on static pressure only?
VSI, Altimeter
Which instrument depend on both impact and static pressure?
Airspeed indicator
What pressures affect the pitot static system?
Dynamic and static
Name and define the three types of airspeed
a. Indicated: read from the dial on the face of the instrument
b. Calibrated: IAS corrected for instrument and position error
c. True: CAS corrected for density error
Name and explain the three errors in the airspeed indicator
a. Installation error: Misalignment of the pitot tube with the relative wind and position of the static vents
b. Density error - caused by pressure and temperature changes, air less dense as altitude changes.
c. Instrument error - caused by friction in the instrument
Is the vertical speed indicator (VSI) a pressure differential measuring instrument?
yes
What does the setting knob on the altimeter change when it is turned?
Kollsman setting and position of the needles
A change of .15 inch of mercury pressure is equal to _______ feet.
150