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EASA ATPLs > Instruments > Flashcards

Instruments Flashcards

1
Q

IN - what type of gyro is in a remote indicating compass?

A

A tied Gyro

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2
Q

IN - How many gimbals does a remote indicating gyro have?

A

Two gimbals

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3
Q

The wind resistence acting on the front of an aircraft is?

A

Dyanmic Pressure

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4
Q

Pitot Systems record________ and ________ to find _________.

A

Pitot Systems record Total Pressure and Static Pressure to find Dynamic Pressure.

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5
Q

Errors in the measurement of a pitot static pressure system will bring errors in the indications of? (4)

A
  • Air Speed
  • Height
  • Vertical Speed
  • Mach Number
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6
Q

The alternate static port inside the aircraft will suffer from______ causing a reading higher/lower than external static pressure.

A
  • Aerodynamic Suction
  • Lower than outside the aircraft
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7
Q

Position Error is, and will cause eronious readings in which instruments?

A

Any error with in the Pitot Static System causing incorrect readings in the pitot static instruments.

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8
Q

Position Error is broken into two sub catagories which are?

A
  • Configuration Error
  • Manoeurvre Error
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9
Q

The Defintion of Configuration error is, and will still affect what instruments?

A

A known error that is resolved during flight testing and is caused by the configuration of the aircraft such as flap position, undercarriage position and angle of attack. This error will be programmed out in the ADC but will still exist in standby instruments.

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10
Q

The definition of Manoeuvre Error is?

A

Manoeuvre Error is caused by rolling, pitching or yawing and random gusts of winds, this can not be programmed out.

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11
Q

Dynamic Heating is caused by and is also known as? (3)

A
  • Caused by the compression of air as it is brought to rest
  • Ram Rise
  • Kinetic Heating
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12
Q

What is the formula for computing True Air Temperature

A

TAT = SAT + (TAS ÷ 100)2

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13
Q
  • What is the Formula for working out SAT?
  • What is the K and where is this information?
A
  • SAT = TAT - K(TAS÷100)2
  • K is the recovery factor and is in the Operations Manual, in modern aircraft it is near 100% and would be 1.0 and have no effect
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14
Q
  • What is the formula for getting TAT with a Mach Number?
  • Temperature in this calculation is in?
A
  • SAT(1+0.2M2)=TAT
  • Kelvins
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15
Q

What is the formula for finding SAT when a Mach number is known?

A

SAT = TAT ÷ (1+0.2KM2)

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16
Q

The total head thermometer uses a?

A

Uses a Nickel wire that changes its electrical resistance with changing temperatures

17
Q

The rosemount probe only indicated correctly when?

A

The aircraft is moving

18
Q

What errors are fund in temperature measurement? (3.2)

A
  1. Instrument Error caused by error in manufactor
  2. Environmental Error caused by solar heating and ice accreation
  3. Heating Error
    1. Heating from Compression between SAT and TAT
    2. Friction heating from the boundary layer
19
Q

Flat plate temperature sensors are suseptable to and not suseptable to?

A

Flat plate sensors are suseptable to:

  • Environmental error
  • Friction Heating in the boundary layer

Not Suseptable to:

  • Heating error due to compression of the air
20
Q

What is the calculation to find Celsius from Farenheight?

A

(F-32) x 5 ÷ 9

21
Q

What is the calculation to find farenheit from celsius?

A

(C x 9 ÷ 5) + 32

22
Q

What are the two types of Angle of Attack Sensors?

A
  1. A vane that is free to line up with the relative airflow
  2. A section of the airfoil blade with a series of pressure measuring holes around the leading edge
23
Q

How does the accelerometer record acceleration?

A

The coils in the are wound in opposite directions so teh flux detector in each leg will cancel each other out and there will be no signal. When the bobweight (ibar) is displaced it will no longer equal 0 and an output signal will be generated. A signal is then fed to re-centre the bob weigh and this is measured as it is the equievelant of the force felt.

24
Q

The IRS will have how many of this type of accelerometer and how will they be mounted?

A

It will have three of this type of accelerometer mounted at right angles to each other.

25
Q

The Green Arc on an ASI shows from to which range of speeds?

A

It goes from Vs1 to Vnoand is the normal operating speed range

26
Q

The Yellow arc on the ASI goes from and to?

A

Vno to Vne

27
Q

IAS is corrected manially for both instrument and position error by which type of speed?

A

RAS (Rectified Air Speed)

28
Q

CAS/RAS corrected for compressebility and not density is called?

A

Equivelent Airspeed (EAS)

29
Q

A Static Blockage Will Cause what to happen to the instruments? (3)

A
  • ASI
    • Increase in the Desent
    • Decrease in the Climb
  • Altimeter
    • Freeze at the last known altitude
  • VSI
    • Will return to 0
30
Q

TAS is EAS corrected for?

A

Density

EASA ATPLs (8 decks)

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