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EASA Aircraft General Knowledge > Pressure instruments > Flashcards

Pressure instruments Flashcards

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1
Q

3 categories of aircraft instruments

A
  • Pressure instruments
  • Gyroscopic instruments
  • Magnetic instruments
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2
Q

Static pressure is measured on the surface of the aeroplane by

A

static vent

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3
Q

Dynamic pressure is related to

A
  • Speed of the body traveling through the air
  • Air density (lower -> lower pressure)
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4
Q

Dynamic pressure formula

A

1/2 * rho * V^2

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5
Q

The pitot-static system is for the following insturments

A

Altitude indicator, VSI, ASI

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6
Q

Vs0

A

Stalling peed with landing gear down, flaps lowered, poweroff

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7
Q

Vs1

A

Stalling speed with landing gear up, flaps up, poweroff

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8
Q

Vfe

A

maximum speed for flaps extended

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9
Q

Vno

A

Maximum structual operatin speed

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10
Q

Vne

A

Never-exceed speed

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11
Q

TAS can be brain-calculated by

A

5000ft is 8% more of IAS
2% of CAS per 1000ft

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12
Q

If static vent is blocked, the ASI in a climb will

A

under-read will show a less value

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13
Q

If static vent is blocked, the ASI in a descent wil

A

over-read

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14
Q

PUDSOD

A

Pitot blocked, asi will Under read in Descent
Static blocked, asi will Over read in a Descent

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15
Q

QNE

A

ISA pressure

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16
Q

How VSI works

A

There’s a delay when a new static pressure enters, therefore a comparison can be made

17
Q

The alternate static source feeds from

A

the cockpit

18
Q

Using the alternate static, the altimeter and IAS

A

altimeter will be higher than actual (since static pressure is a bit less in the cockpit)
VSI will over-read

19
Q

Altimeter errors

A
  • Pressure (static is not accurately measured due to slip or skid)
  • Intrument errors
  • Time lag
  • Temparature
  • Orographic
20
Q

Two static vents help

A

reduce errors, if one vent is having distrubed airflow, the other one can compensate

EASA Aircraft General Knowledge (14 decks)

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