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Common Core > Pitot Static System and Weather > Flashcards

Pitot Static System and Weather 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 degrees Celsius?

A

15° C

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4
Q

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

A

2°C/1,000’

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5
Q

What is the standard temperature lapse rate with altitude?

A

1,000

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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 depends on both impact (dynamic) 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 increases
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 each of the following.

Indicated altitude-

True altitude-

Pressure altitude-

Absolute altitude

A

a. Altimeter indication
b. Altitude above MSL
c. Altitude above the standard datum plane (29.92” Hg)
d. Altitude above the terrain

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17
Q

Define altimeter setting.

A

Station pressure corrected to MSL

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18
Q

Why is an altimeter setting necessary?

A

To correct for pressure changes

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19
Q

What is the maximum allowable error in the altimeter?

A

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

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20
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

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21
Q

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

A

Higher

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22
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 indicate altitude would true altitude be prior to adjusting the altimeter to the new setting?

A

400’ Higher than indicated altitude

23
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’ feet lower than indicated altitude

24
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

25
Q

In a thru e below, is true altitude higher, lower, or the same as indicated altitude? (NOTE: The standard temperature must be computed for each altitude first.)

Indicated Altitude Standard Temp Free-air Temp True Altitude

6,000 ____________ 3°C ____________

10,000 ____________ -35°C ____________

8,500 ____________ 10°C ____________

2,000 ____________ 0°C ____________

11,000 ____________ -7°C ____________

A

Standard Temp True Altitude

a. 3°C Same
b. -5°C Lower
c. -2°C Higher
d. 11°C Lower
e. -7°C Same

26
Q

In a thru e below, is density altitude higher, lower, or the same as pressure altitude? (NOTE: The standard temperature must be computed for each altitude.)

Pressure Altitude Standard Temp Free-air Temp Density Altitude

7,000 ____________ 15°C _____________

9,000 ____________ -18°C _____________

5,500 ____________ 4°C _____________

3,000 ____________ -9°C _____________

12,000 ____________ -9°C _____________

A

Standard Temp Density Altitude

a. 1°C Higher
b. -3°C Lower
c. 4°C Same
d. 9°C Lower
e. -9°C Same

27
Q

The _____________________________________________ (instrument) stops functioning properly due to pitot icing.

A

Airspeed Indicator

28
Q

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

A

Switch to an alternate source.

29
Q

High DA and low air density mean nearly the same thing. (True or False)?

A

True

30
Q

What causes density error?

A

Nonstandard pressure and temperature.

31
Q

Define true airspeed?

A

Calibrated Airspeed (CAS) corrected for density error.

32
Q

Pressure High
Temperature Low
Humidity Low

A

More favorable for flight

More lift production

Increasing density

Low density altitude

33
Q

Pressure Low
Temperature High
Humidity High

A

Less favorable for flight

Less lift produced

Decreases overall density

High density altitude

34
Q

How many instruments use pressure?

A

All three

altimeter, vertical speed indicator VSI), and Airspeed

35
Q

How many instruments use static pressure only?

A

2

altimeter, VSI

36
Q

How many instruments use dual pressure?

A

1

Airspeed

37
Q

How many instruments fail on a static pressure dump?

A

all three

38
Q

How many instruments fail with a pitot tube blockage?

A

1 airspeed

39
Q

What are the reportable ceilings for the FAA?

A

Broken and Overcast

40
Q

9999

A

7 SM or greater

41
Q

NSW

A

No significant weather

42
Q

100857Z

RMK TSB18E50

A

Thunderstorms begin at 0818Z

Thunderstorms end at 0850Z

43
Q

P6SM

A

Indicates visibility is 7 SM or greater (civilian TAFs only)

44
Q

CB

A

Indicates the sky condition and is the only cloud type shown on TAF. ex: OVC020CB

45
Q

Light =

Moderate =

Heavy =

A

Light = -

Moderate = No sign

Heavy = +

46
Q 
Precipitation
DZ – 
RA – 
SN – 
SG – 
IC – 
PL – 
GR – 
GS – 
UP –
A 
DZ – drizzle
RA – rain
SN – snow
SG – snow grains (< ¼” diameter)
IC – ice crystals
PL – ice pellets
GR – hail (>= ¼” diameter)
GS – small hail (< ¼” diameter)
UP – unknown precipitation
47
Q 
Proximity
On Station (OS) –

Vicinity (VC) –

Distant (DSNT) –

A

On Station (OS) – within 5 SM of point of observation

Vicinity (VC) – between 5-10 SM of point of observation

Distant (DSNT) – beyond 10 SM of point of observation

48
Q 
Obscurations
FG – 
BR – 
FU – 
VA – 
DU –
SA – 
HZ – 
PY –
A 
FG – Fog (vis <5/8 SM)
BR – Mist (vis >5/8 SM)
FU – Smoke
VA – Volcanic Ash
DU – Dust
SA – Sand
HZ – Haze
PY – Spray
49
Q 
Descriptors
MI – 
PR – 
BC – 
DR – 
BL – 
SH – 
TS – 
FZ –
A 
MI – Shallow
PR – Partial
BC – Patches
DR – Low Drifting
BL – Blowing
SH – Showers
TS – Thunderstorms
FZ – Freezing
50
Q

If the sky is totally obscured, the ____ will be the ceiling.

A

If the sky is totally obscured, the vertical visibility will be the ceiling.

51
Q

What are the three components of atmosphere density?

A

Temperature, pressure, and humidity

52
Q

Two layers of ceilings?

A

Few and scattered

53
Q

Lightning reporting

A

IC - in cloud
CC- cloud to cloud
CG - cloud to ground

54
Q

SLP conversion

0-4=

5-9=

A

0-4= place 10 in front

5-9= place 9 in front

Common Core (42 decks)

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