Pitot static systems

Question 1

What is atmospheric pressure?

Answer 1

The force exerted by the weight of a column of air

Question 2

What is standard sea level pressure in inches of mercury

Answer 2

29.92

Question 3

What is standard sea level temperature in decrees Celsius?

Answer 3

15 C

Question 4

What is the standard temperature lapse rate with altitude?

Answer 4

2 degrees C pr 1000’

Question 5

A change in 1 inch of mercury pressure is equal to approximately ________ feet of altitude.

Answer 5

1000’

Question 6

Define impact pressure

Answer 6

Static pressure plus dynamic pressure

Question 7

Define static pressure

Answer 7

Ambient pressure

Question 8

Which instruments depend on static pressure only?

Answer 8

VSI, Altimeter

Question 9

Which instrument depend on both impact and static pressure?

Answer 9

Airspeed indicator

Question 10

What pressures affect the pitot static system?

Answer 10

Dynamic and static

Question 11

Name and define the three types of airspeed

Answer 11

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

Question 12

Name and explain the three errors in the airspeed indicator

Answer 12

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

Question 13

Is the vertical speed indicator (VSI) a pressure differential measuring instrument?

Answer 13

yes

Question 14

What does the setting knob on the altimeter change when it is turned?

Answer 14

Kollsman setting and position of the needles

Question 15

A change of .15 inch of mercury pressure is equal to _______ feet.

Answer 15

150

Question 16

Define indicated altitude

Answer 16

Altimeter indication

Question 17

Define True altitude

Answer 17

Altitude above MSL

Question 18

Define Pressure altitude

Answer 18

Altitude above the Standard Datum Plane (29.92” Hg)

Question 19

Define Absolute altitude

Answer 19

Altitude above ground

Question 20

Define Altimeter setting

Answer 20

Station pressure corrected to MSL

Question 21

Why is an altimeter setting necessary?

Answer 21

To correct for pressure changes

Question 22

What is the maximum allowable error in the altimeter?

Answer 22

75’ +/- but operators manual should be checked to confirm accurate limit for their aircraft.

Question 23

When flying into an area with lower pressure without resetting the altimeter, would your true altitude be higher or lower than your indicated altitude?

Answer 23

Lower

Question 24

When flying into an area of higher pressure without resetting the altimeter, would your altimeter indicate higher or lower than your true altitude?

Answer 24

Lower

Question 25

If you depart a base with an altimeter setting of 29.82 and an hour later receive a new altimeter setting of 30.22, how much higher or lower than true altitude would the altimeter indicate prior to adjusting the altimeter to a new setting?

Answer 25

400' lower than true altitude

Question 26

At the last reporting point you corrected the altimeter by setting 29.80. what is your true altitude in relation to indicated altitude (before you reset the altimeter)?

Answer 26

120 lower than indicated altitude

Question 27

When flying into an area of colder than standard temperature, would the indicated altitude be more or less than true altitude?

Answer 27

More

Question 28

What causes density error?

Answer 28

Nonstandard pressure and temperature

Question 29

Define true airspeed

Answer 29

Calibrated airspeed corrected for density error.