Chapter 8, Flight Instruments Flashcards
What instruments use the pitot-static system?
Vertical Speed
Altimeter
Airspeed
What is used to measure the total combined pressures that are present when an aircraft moves through the air?
Pitot tube
What is also known as ambient pressure, is always present whether an aircraft is moving or at rest, and is simply the barometric pressure in the local area.
Static pressure
How does the total pressure enter the pitot tube?
An opening at the front
Total pressure is made up of dynamic pressure plus what other pressure?
Static air
What is the purpose of the small hole at the back of the pitot tube?
Moisture drain
What is the one instrument that utilizes the pitot tube?
Airspeed
True or false, the instrument mentioned in the question above requires static pressure as well.
True
What is an instrument that measures the height of an aircraft above a given pressure level?
Altimeter
What is a sealed wafer that is evacuated to an internal pressure of 29.92 inches of mercury (“Hg)?
Expand
The altimeter uses ____________ pressure as its source of operation.
Static air
True or false, as altitude decreases atmospheric pressure decreases.
False
What is the purpose of the adjustment knob on an altimeter?
Adjusting the barometric pressure setting
How does the pilot know the setting for the altimeter?
Zero
True or false, the Vertical Speed Indicator (VSI) utilizes a calibrated leak.
True
When the aircraft is on the ground, the pressure on the inside of the (VSI) diaphragm is ____________ the pressure of the instrument case.
Equal to
When the aircraft moves through the air, the pressure on the pitot line becomes ____________ the pressure in the static lines.
Greater than
A blocked pitot tube affects the accuracy of the ____________.
Airspeed Indicator
A blockage of the static port affects the ____________.
Vertical Speed Indicator
Airspeed Indicator
Altimeter
What is a separate solid-state device that, in addition to providing altitude, vertical speed, and airspeed data to the Primary Flight Display (PFD), is capable of providing the same data to the autopilot control system?
Air Data Computer
Select each of the indicators that use a gyroscope.
Attitude Indicator
Heading Indicator
The two fundamental properties of gyroscopic action are rigidity in space and ____________.
Precession
What is the principle that a gyroscope remains in a fixed position in the plane in which it is spinning?
Rigidity
What is the tilting or turning of a gyro in response to a deflective force that does not occur at the point at which it was applied; rather, it occurs at a point that is 90° later in the direction of rotation?
Precession
How can aircraft instrument gyroscopes be operated?
Pressure
Vacuum
Electrically
Because of the way its gyro is mounted, the ____________ indicator shows only the rate of turn in degrees per second.
Turn-and-Slip
Which indicator has a gyro mounted at an angle, so it can show roll rate and rate of turn?
Turn coordinator
Which indicator uses an aircraft symbol and a horizon bar?
Attitude
The gyro in the attitude indicator depends upon what fundamental property for its operation?
Rigidity
An error in the heading indicator is caused by the fact that the Earth rotates in space. So the heading indicator may indicate as much as ____________ degrees error per every hour of operation.
15
Horizontal situation indicators (HSI) receive a ____________ reference from a slaving transmitter and generally need no adjustment.
Magnetic north
What compass error is caused by the difference between true north and the earth’s magnetic north?
Variation
What compass error is caused by magnetic fields in the aircraft including flowing electrical current, and magnetized parts that conflict with the Earth’s magnetic field.
Deviation
