Pitot static systems Flashcards

1
Q

What is atmospheric pressure?

A

The force exerted by the weight of a column of air

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2
Q

What is standard sea level pressure in inches of mercury

A

29.92

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3
Q

What is standard sea level temperature in decrees Celsius?

A

15 C

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4
Q

What is the standard temperature lapse rate with altitude?

A

2 degrees C pr 1000’

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5
Q

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

A

1000’

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6
Q

Define impact pressure

A

Static pressure plus dynamic pressure

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7
Q

Define static pressure

A

Ambient pressure

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8
Q

Which instruments depend on static pressure only?

A

VSI, Altimeter

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9
Q

Which instrument depend on both impact and static pressure?

A

Airspeed indicator

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10
Q

What pressures affect the pitot static system?

A

Dynamic and static

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11
Q

Name and define the three types of airspeed

A

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

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12
Q

Name and explain the three errors in the airspeed indicator

A

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

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13
Q

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

A

yes

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14
Q

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

A

Kollsman setting and position of the needles

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15
Q

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

A

150

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16
Q

Define indicated altitude

A

Altimeter indication

17
Q

Define True altitude

A

Altitude above MSL

18
Q

Define Pressure altitude

A

Altitude above the Standard Datum Plane (29.92” Hg)

19
Q

Define Absolute altitude

A

Altitude above ground

20
Q

Define Altimeter setting

A

Station pressure corrected to MSL

21
Q

Why is an altimeter setting necessary?

A

To correct for pressure changes

22
Q

What is the maximum allowable error in the altimeter?

A

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

23
Q

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

A

Lower

24
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

25
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 a new setting?

A

400’ lower than true altitude

26
Q

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)?

A

120 lower than indicated altitude

27
Q

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

A

More

28
Q

What causes density error?

A

Nonstandard pressure and temperature

29
Q

Define true airspeed

A

Calibrated airspeed corrected for density error.