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ATAV 603: Instruments > Week 3: Pitot Static Instruments > Flashcards

Week 3: Pitot Static Instruments Flashcards

1
Q

If you apply soapy water to a static port when the Altimeter is reading ASL, what happens?

A

It sucks in the water (destroys ALT)

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2
Q

What type of pressure goes into the altimeter and VSI?

A

Negative pressure

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3
Q

Should your altimeter be reading BSL or ASL before applying soapy water to it?

A

Below Sea Level

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4
Q

True or False, your static source is a vacuum?

A

True

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5
Q

What does the static port introduce?

A

Outside air at its normal atmospheric pressure (not moving)

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6
Q

The static port applies air to which instruments?

A

ASI, VSI, ALT

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7
Q

What is pitot pressure?

A

Generated by the fwd motion of the aircraft thru air

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8
Q

Pitot pressure is also know as what?

A

Impact, ram, total pressure

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9
Q

Which instrument uses pitot pressure?

A

ASI, Mach meter

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10
Q

Pitot tubes have what to keep them from icing?

A

Anti-icing

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11
Q

During leak checks what should you check?

A

Connections and junctions

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12
Q

Advanced pitot static systems have how many pitot tubes and static ports?

A

3 pitot, 6 static

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13
Q

What are the 2 modules in a Mach meter?

A

Airspeed and Altitude module

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14
Q

The mach meter/speed of sound depends on what?

A

Your altitude

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15
Q

What is the only instrument that normally points at 9oclock?

A

VSI

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16
Q

When is attenuated speed most important?

A

When landing

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17
Q

The ASI measures what?

A

Pitot and Static, differential pressure, speed of aircraft thru the air

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18
Q

What is indicated airspeed?

A

read directly from instrument

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19
Q

This type of airspeed is relative of the airmass you are moving through and compensates for pressure and temperature

A

True Airspeed

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20
Q

What is ground speed?

A

Speed of aircraft relative to the ground

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21
Q

When are ground speed and true airspeed the same?

A

no wind

22
Q

If you set your altimeter to your current barometric pressure for that day, what should the ALT be reading?

A

0

23
Q

How do you force your altimeter to read 0?

A

Decouple the baroset knob using the screw and then turn it to 0 then recouple it

24
Q

The ALT is connected to what?

A

Static port

25
Q

The ALT indicates what?

A

Height above sea level MSL/ASL

26
Q

If the aircraft is flying below 18000ft what should the ALT be set to?

A

Local barometric pressure (Indicated Alt)

27
Q

If the aircraft is flying above FL180 what will the ALT baro be set to?

A

29.92inHg

28
Q

Indicated alt and pressure alt can be the same when?

A

On a standard day

29
Q

What are the 5 types of Altimeters?

A

Sensitive, Encoding, Counter Drum, Servo, RadALT

30
Q

What does the encoding altimeter encode the alt info for?

A

Txpr and ATC

31
Q

The counter drum pointer range is what?

A

0-999

32
Q

A servo alt has what?

A

A servo

33
Q

How does the RAD ALT work and what does it measure?

A

Sends signal to ground and back then measures the time difference

34
Q

When is the RAD ALT used and what is its range??

A

During approach and a range of FL25

35
Q

How often do Altimeters require testing?

A

Every 24 months

36
Q

In the ASI the case is vented to what? The diaphragm is vented to what?

A

Case vented to static port

Diaphragm to pitot port

37
Q

The white arc on the ASI means what?

A

Flap operating range

38
Q

The blue on the ASI is set by who?

A

Manufacturer

39
Q

What does the mach meter show?

A

ratio of true airspeed to local speed of sound

40
Q

As altitude increases what happens to the speed of sound?

A

Decreases

41
Q

At what altitude does the speed of sound stop decreasing?

A

36000ft

42
Q

Mach speed depends on what?

A

Altitude and temperature

43
Q

How do you zero out a VSI that is not reading zero when on the ground?

A

Zeroing screw on bottom left side of instrument to adjust

44
Q

What does the VSI indicate?

A

RATE of change of altitude in ft/min

45
Q

The calibrated leak acts as a what?

A

A restrictor valve that prevents the case from getting instant pressure

46
Q

In the VSI what gets the instant static pressure?

A

The diaphragm

47
Q

If capsule has decreased pressure and case has higher pressure what does this mean?

A

Aircraft is climbing

48
Q

Explain what happens in the VSI when the aircraft is descending

A

Capsule has higher pressure compared to case which has lower pressure

49
Q

What does the IVSI have that makes it instant?

A

Accelerometers

50
Q

The in class barfield tester does not have a what?

A

VSI

ATAV 603: Instruments (7 decks)

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