Flight Instruments Part 2/3

Question 1

Errors almost always indicate what

Answer 1

Blockage of the pitot tube, static ports, or both

Question 2

Blockage of the pitot tube or static ports can be caused by:

Answer 2

Moisture (ice)
Dirt
Insects

Question 3

Blockage of the static port affects:

Answer 3

ASI
Altimeter
VSI

Question 4

Blockage of pitot tube affects

Answer 4

ASI

Question 5

If pitot tube becomes blocked and drain hole remains clear:

Answer 5

Remaining pressure of ASI drops to ambient outside air pressure. ASI decreases to zero because ASI senses no differences between ram and static air pressure

Question 6

If both pitot tube opening and drain hole become clogged simultaneously

Answer 6

Pressure in pitot tube is trapped. No change is noted on the ASI, should the airspeed increase or decrease.

Question 7

If static port is unblocked and aircraft changes altitude, ASI will

Answer 7

ASI will change, but change is not related to a change in airspeed but a change in static pressure because ASI relies on dynamic and static pressure.

Question 8

If static system becomes blocked but the pitot tube remains clear. If aircraft descends, the static pressure increases on the pitot side showing an (increase or decrease?) on the ASI

Answer 8

increase on the ASI

Question 9

If an aircraft begins to climb after a static becomes blocked, the ASI begins to

Answer 9

decrease as the aircraft continues to climb

Question 10

Trapped static pressure causes

Answer 10

The altimeter to freeze at the altitude where the blockage occurs.

Question 11

A blocked static system causes VSI to

Answer 11

produce a continuous zero indication

Question 12

What is an EFD?

Answer 12

Electronic Flight Display?

Question 13

What is an Air Data Computer (ADC)

Answer 13

Pitot static inputs are translated for the EFD using an ADC

Question 14

What is a trend vector on an EFD?

Answer 14

Magenta lines that move up and down on the ASI and Altimeter. ADC computes the rate of change and displays the 6 second projection of where the aircraft will be.

Question 15

What instruments utilize gyroscopes?

Answer 15

Turn coordinator
Heading indicator
Attitude indicator

Question 16

Name two important design characteristics of an instrument gyro.

Answer 16

Great weight for its size (or high density) & rotation at high speed with low friction bearings.

Question 17

Name two fundamental properties of gyroscopic action.

Answer 17

Rigidity in space: gyroscope remains in a fixed position in the plane that it is spinning (more stable and less maneuverable at high speeds)

Precession: tilting and turning of gyro in response to a deflective force

Question 18

Describe an airplane’s vacuum system with respect to it’s gyro

Answer 18

The vacuum system or pressure system spins the gyro by drawing a stream of air against the rotor veins to spin the rotor at high speeds

Question 19

What indicators may become inaccurate if vacuum suction pressure is low?

Answer 19

Attitude & heading indicators

Question 20

Name two types of turn indicators used in aircrafts.

Answer 20

Turn & slip indicator
Turn coordinator

Both of these indicate turn direction and quality (coordination)

Question 21

On the turn coordinator indicator, what does is the little ball called?

Answer 21

Inclinometer, a liquid filled curved tube

Question 22

What is a turn coordinator used for?

Answer 22

Used to establish maintain a standard rate turn by aligning the wing with the turn index

Question 23

What are the marks on the outside of a turn coordinator?

Answer 23

First set of marks indicates an aircrafts level zero rate of turn
Second set of marks indicates a standard rate turn

Question 24

What is a standard rate turn defined as?

Answer 24

A turn rate of 3degrees per second

Question 25

What does a turn coordinator indicate?

Answer 25

Rate & direction of turn. It does not display any specific angle of bank

Question 26

What does the inclinometer of the turn coordinator depict?

Answer 26

aircraft yaw (side to side movement of aircrafts nose)

Question 27

Describe a slip

Answer 27

The rate of turn is too slow for the angle of bank. Ball moves to inside of the turn (same direction of the turn direction)

Question 28

Describe a skid

Answer 28

Rate of turn is too great for the angle of bank and ball moves to the outside of the turn

Question 29

Preflight for inclinometer:

Answer 29

Make sure it is full of fluid with no air bubbles, ball should be resting at its lowest point

Question 30

How is the gyro mounted in the turn indicator?

Answer 30

on vertical plane

Question 31

How is the gyro mounted in the attitude indicator?

Answer 31

on horizontal plane