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Commercial Knowledge (some) > Avionics > Flashcards

Avionics Flashcards

1
Q

What is the pitot static system?

A

Consists of airspeed, altimeter, and vertical speed indicator. It relies on air pressure differences to measure speed and altitude.

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2
Q

What are the types of pressure associated with Pitot system?

A

Impact-air hitting the pitot tube
Ram
Dynamic pressure- air inside pitot tube
Static pressure- ambient air outside measured by static port.

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3
Q

What does the Pitot static system consist of?

A

•altimeter
•airspeed indicator
•VSI
•Pitot tube
•Pitot heat
•static port
•Alternate Static Source

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4
Q

What does the Pitot Tube connect to?

A

Airspeed indicator

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5
Q

What does the static port connect to?

A

Airspeed,Altimeter, and VSI

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6
Q

How does the Airspeed indicator work?

A

Compares Ram air pressure with the static air pressure.
Ram air enters the diaphragm and static air enters the airspeed indicator body, ram air pushes the diaphragm with static resistance and moves levers and gears to display speed.

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7
Q

How does the Altimeter work?

A

Inside the altimeter is a sealed disc called an aneroid wafers. As the aircraft goes up, the pressure inside the case decreases and the aneroid wafers expand. The opposite happens as the aircraft descends.
The aneroid wafers are set to a standard pressure.

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8
Q

How does the VSI work?

A

Static pressure enters the diaphragm and outside pressure is measured in the case with a calibrated leak. As the aircraft climbs the pressure decreases shrinking the diaphragm slowly while the calibrated leak is bringing air in.

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9
Q

What are the different types of airspeeds?

A

Indicated Airspeed
True Airspeed
Ground speed
Calibrated Airspeed

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10
Q

What is indicated Airspeed?

A

Airspeed that is indicated by the instrument.

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11
Q

What is True Airspeed?

A

Speed of the aircraft relative to the air it’s flying through. Every thousand feet TAS is 2% faster than indicated.

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12
Q

What is Groundspeed?

A

The movement of the airplane relative to the ground. True airspeed Corrected for headwinds/tailwinds

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13
Q

What is calibrated airspeed?

A

•Calibrated airspeed is indicated airspeed corrected for instrument and positional errors.

•When flying at sea level under International Standard Atmosphere (ISA) conditions (15 degrees Celsius, 29.92 inches of mercury, 0% humidity), calibrated airspeed is the same as true airspeed.

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14
Q

What are the different types of altitudes? (5)

A

Indicated altitude
Pressure altitude
Density altitude
True altitude
Absolute altitude

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15
Q

What is indicated altitude?

A

Altitude that is being indicated by the altimeter.

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16
Q

What is pressure altitude?

A

The altitude that shows when you set your altimeter to 29.92

17
Q

What is density altitude?

A

Density altitude is pressure altitude corrected for non standard temperature.

18
Q

What is true altitude?

A

Altitude above sea level, (MSL)

19
Q

What is absolute altitude?

A

Altitude above the ground, commonly known as AGL.

20
Q

What is Rigidity in space?

A

the principle that a gyroscope remains in the fixed position on the plane in which it is spinning, unaffected by the Earth’s rotation or other forces acting around it.

21
Q

What is gyroscopic procession?

A

a principle of gyroscopes that states when a force is applied to a spinning object, the maximum reaction occurs approximately 90 degrees later in the direction it is spinning.

22
Q

Why does the Directional Gyro move over time?

A

Because earth spins 15 degrees per hour, apparent drift, and because errors of imperfect balancing of the gyro.

23
Q

What are the magnetic compass errors? (VDMONA)

A

Deviation
Variation
Oscillation
Magnetic Dip
ANDS
UNOS

24
Q

What is magnetic variation?

A

Variation is the difference between true north and magnetic north. (East is least, west is best)

25
Q

What is magnetic deviation?

A

Instruments in your airplane cause interference that affects your compass, and that interference is called deviation.
Planes should have a deviation card to counteract that.

26
Q

What is Magnetic dip?

A

As you get closer to the North or South Pole, magnetic flux lines point downwards towards the poles, and your compass magnets dip towards the low side of a turn.

27
Q

What is ANDS? (Magnetic compass error)

A

Accelerate North Decelerate south, In the Northern Hemisphere, as you accelerate, your compass will show a turn to the North. And as you decelerate, your compass will show a turn to the South. (Greatest on east or west headings)

28
Q

What is UNOS(magnetic compass error)

A

Undershoot North Overshoot South.

29
Q

How to handle check equipment?

A
  1. Check MEL
    2.Check KOEL/POH
    3.VFR or IFR requirements(91.205)
30
Q

What if equipment is INOP?

A
  1. Disable/Deactiviate
  2. Placard
  3. Maintenance Logs

Commercial Knowledge (some) (6 decks)

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