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URS classes > Pitot Static > Flashcards

Pitot Static Flashcards

1
Q

What are the two most critical factors of the atmosphere?

A

Temperature and pressure

Temperature is the most critical everything in the atmosphere chases it

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2
Q

What is atmospheric pressure?

A

The force exerted by the weight of a column of air

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3
Q

What is standard sea level pressure in inches of mercury?

A

29.92

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4
Q

What is standard sea level temperature in degrees Celsius?

A

15 degrees

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5
Q

What is standard temperature lapse rate with altitude?

A

2 degrees/ 1,000 feet

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6
Q

A change in 1 inch of mercury pressure is approximately ___________ feet of altitude.

A

1,000

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7
Q

Define impact pressure.

A

Static pressure plus dynamic pressure

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8
Q

Define static pressure

A

Ambient pressure

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9
Q

Which instruments depend on static pressure only?

A

VSI and Altimeter

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10
Q

Which instrument depends on both impact and static pressure?

A

Airspeed indicator

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11
Q

What pressures affect the pitot static system?

A

Dynamic and static

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12
Q

Three types of airspeed

A

Indicated, calibrated, and true

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13
Q

Indicated airspeed

A

Read from the dial on the face of the instrument

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14
Q

Calibrated airspeed

A

IAS corrected for instrument and installation error

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15
Q

True airspeed

A

CAS corrected for density error

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16
Q

Three errors in airspeed indicator

A

Installation, density, and instrument

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17
Q

Installation error

A

Caused by misalignment of the pitot tube with the relative wind and position of the static vents

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18
Q

Density error

A

Caused by pressure and temperature changes, air less dense as altitude increases

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19
Q

Instrument error

A

Caused by friction in the instrument

20
Q

Is the VSI a pressure differential measuring instruments?

A

yes

21
Q

Pressure used in the diaphragm of the VSI

A

Static

22
Q

Pressure used in the case of the VSI

A

restricted static

23
Q

How much time lag does the VSI have when leveling off from a climb or descent?

A

a few seconds

24
Q

The altimeter is a ____ with a Kollsman window to adjust for atmospheric pressure changes.

A

Aneroid barometer

25
Q

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

A

Kollsman setting and position of the needles

26
Q

How would the altimeter react to a pressure increase while on the ramp and again in flight?

A

It would indicate a lower altitude on the ramp; the change would not be apparent in flight.

27
Q

How would the Kollsman window react to a pressure increase while on the ramp and again in flight?

A

No change in either

28
Q

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

A

150 feet

29
Q

Indicated altitude

A

Altimeter indication

30
Q

True altitude

A

Altitude above MSL

31
Q

Pressure Altitude

A

Altitude above the standard datum plane (29.92”Hg)

32
Q

Absolute altitude

A

Altitude above the terrain

33
Q

Altimeter setting

A

station pressure corrected to MSL

34
Q

Why is an altimeter setting necessary?

A

To correct for pressure changes

35
Q

Maximum allowable error in the altimeter

A

75’ (FAA), aviators should check operator or maintenance manual to confirm accurate limit for their aircraft.

36
Q

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

A

lower

37
Q

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 the new setting?

A

400’ lower than true altitude

38
Q

At the last reporting point, you corrected the altimeter by setting the Kollsman scale on 29.92.” Hg. Prior to landing, you received a new setting of 29.80. What is your true altitude in relation to indicated altitude (before you reset the altimeter)?

A

120’ lower than indicated altitude

39
Q

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

A

lower

40
Q

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

A

more

41
Q

What instrument stops functioning properly due to pitot icing?

A

airspeed indicator

42
Q

What is the recommended corrective action when the static system is clogged

A

switch to an alternate source or break the glass on the VSI

43
Q

(true or false) High DA and low air density mean nearly the same thing

A

true

44
Q

What causes density error?

A

Nonstandard pressure and temperature

45
Q

True airspeed

A

CAS corrected for density error

URS classes (4 decks)

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