Pitot Static

Question 1

If a pilot changes the altimeter setting from 30.11 to 29.96, what is the approximate change in indication?

Answer 1

The altimeter will indicate 150 feet lower

The difference between 30.11 and 29.96 is .15”Hg. The standard lapse rate is 1” Hg per 1,000’ in altitude. Therefore, .15 x1,000’ = 150’ and the indication would be lower.

Question 2

Under what condition is pressure altitude and density altitude the same value?

Answer 2

At standard temperature.

Pressure altitude and density are the same value in standard conditions.

Question 3

How do variations in temperature affect the altimeter?

Answer 3

Pressure levels are raised on warm days and the indicated altitude is lower than true altitude.

On a warm day, the atmosphere expands. An aircraft will actually be higher than the altimeter is indicating (higher pressure level). On a cold day the atmosphere contracts and an aircraft will be lower than the altimeter is indicating.

Question 4

What represents the maximum structural cruising speed?

Answer 4

The upper limit of the green arc

Question 5

Which instrument will become inoperative if the pitot tube becomes clogged?

Answer 5

Airspeed

The pitot tube provides ram air to operate the airspeed indicator. It does not affect the other two pitot-static instruments.

Question 6

What is pressure altitude?

Answer 6

The altitude indicated when the barometric pressure scale is set to 29.92.

Pressure altitude is indicated when the altimeter setting window (barometric scale) is adjusted to 29.92”Hg.

Question 7

If it is necessary to set the altimeter from 29.15 to 29.85, what change occurs?

Answer 7

a 700 foot increase in indicated altitude

Question 8

What represents the full flap operating range for an aircraft?

Answer 8

The white arc on the airspeed indicator represents the flap operating range for an aircraft.

Question 9

What factor would tend to increase the density altitude at a given airport?

Answer 9

An increase in ambient temperature

The primary factor that would tend to increase density altitude at a given airport is an increase in ambient temperature. The hotter the air temperature, the less dense the air. This is equivalent to increasing density altitude.

Question 10

What represents the caution range of an airplane?

Answer 10

The yellow arc on the airspeed indicator

Question 11

If the pitot tube and outside static vents become clogged, which instruments would be affected?

Answer 11

The altimeter, airspeed indicator, and vertical speed indicator.

Question 12

What is the maximum speed at which an airplane can be operated in smooth air?

Answer 12

The never exceed speed is indicated on the airspeed indicator with a red line

Question 13

What is absolute altitude?

Answer 13

The vertical distance of the aircraft above the surface.

Question 14

What color identifies the never-exceed speed?

Answer 14

The red radial line.

Question 15

The pitot system provides impact pressure for which instrument?

Answer 15

Airspeed indicator.

The pitot tube provides ram air to operate the airspeed indicator. It does not affect the other two pitot-static instruments.

Question 16

Which condition would cause the altimeter to indicate a lower altitude than true altitude?

Answer 16

air temperature warmer than standard.

When air is warmer than average, the aircraft is higher than the altimeter indicates. Therefore, the altimeter will read lower than the aircraft’s actual altitude.

Question 17

Which instrument(s) will become inoperative if the static vents become clogged?

Answer 17

All three pitot-static instruments are affected by a clogged static vent - airspeed indicator, altimeter, and vertical speed.

Question 18

Under what condition will true altitude be lower than indicated altitude?

Answer 18

IN colder than standard air temperature

Question 19

Under which conditions will pressure altitude be equal to true altitude?

Answer 19

When standard atmospheric conditions exist.

True altitude is the actual altitude above MSL. Pressure altitude is the altitude in the standard atmosphere where pressure is the same as where you are. Pressure altitude is = to true altitude in standard temperature

Question 20

Which color identifies the power-off stalling speed with wing flaps and landing gear in the landing configuration?

Answer 20

The lower limit of the white arc.

Question 21

If a flight is made from an area of high pressure into an area of lower pressure without the altimeter setting being adjusted, the altimeter will indicate

Answer 21

higher than actual altitude above sea level

Question 22

Which color identifies the power-off stalling speed in a specified configuration?

Answer 22

The lower limit of the green arc.

Question 23

What is the maximum flaps extended speed?

Answer 23

Upper limit of the white arc

Question 24

Under what condition is indicated altitude the same as true altitude?

Answer 24

When at sea level under standard conditions

Question 25

If the OAT at a given altitude is warmer than standard, the density altitude is…?

Answer 25

higher than pressure altitude

Question 26

As altitude increases the indicated airspeed at which a given airplane stalls in a particular configuration will…?

Answer 26

remain the same regardless of altitude.

Indicated airspeed is dependent on the amount of ram air pressure entering the pitot tube. Regardless of an aircraft’s altitude, the indicated airspeed for a particular maneuver remains the same

Question 27

What is true altitude?

Answer 27

The vertical distance of the aircraft above sea level

Question 28

What is density altitude?

Answer 28

The pressure altitude corrected for nonstandard temperature.

Question 29

Altimeter setting is the value to which the barometric pressure scale of the altimeter is set sot he altimeter indicates?

Answer 29

true altitude at field elevation

Question 30

If a flight is made from an area of low pressure into an area of high pressure without the altimeter setting being adjusted, the altimeter will indicate..?

Answer 30

lower than the actual altitude above sea level.

When flying from an area of low pressure to an area of high pressure, the aircraft will be higher than the indication on the altimeter. Therefore, the altimeter will read lower than the aircraft’s actual altitude.

Question 31

What is an important airspeed limitation that is not color coded on airspeed indicators?

Answer 31

Maneuvering speed. Sometimes called, “rough air speed.”