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Mod 11 2.0 > 11.5.1 - Instrument System > Flashcards

11.5.1 - Instrument System Flashcards

1
Q

In an unpressurised aircraft (cessna), the Alternate static source valve can be taken from the ______

A

cockpit

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2
Q

What does the Auxilliary pitot tube feed ?

A

Auto pilot

yaw dampers

overspeed warning system

flight recorded

flight directors

cabin diff. pressure

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3
Q

__________ converts pitot or static pressure into digital output signal through ________ databus

A

ADM (Air Data Module)

ARINC 429

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4
Q

In an altimeter, the bellows are designed with corrugations that allow ____________________

with a change in altitude

A

the expansion to be linear

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5
Q

What baro setting (QNH,QFE or QNE) are aeronautical charts usually set to?

A

QNH

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6
Q

What is the maximum altitude that a radio altimeter can kick in from?

A

2500 ft

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7
Q

__________ minimises static error

A

servo altimeter

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8
Q

Name the types of errors associated with altimeters (6)

A
  1. Scale Error
  2. Hysteresis
  3. After effect
  4. Friction
  5. Case Leak
  6. Barometric scale error
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9
Q

What is the difference between the VSI and altimeter

A

VSI has a pinhole in it which allows an accurately calibrated leak

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10
Q

An IVSI (Instantaneous Vertical Speed Indicator) has a _______

A

pump

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11
Q

The __________ is used for the power setting of the engines

A

TAT (Total air temperature probe)

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12
Q

Aircraft fly at about _____ Mach

A

0.85

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13
Q

Indications on an airspeed indicator are for the following:

Structural limit

Aerodynamic limit

A

Structural limit - Fixed red line (vmo)

Aerodynamic limit - Red barber pole (mmo)

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14
Q

As temperature decreases

The speed of sound ______

A

decreases

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15
Q

Vertical gyro =

Horizontal gyro =

A

Vertical gyro = attitude gyro = (pitch and roll)

Horizontal gyro = directional gyro ( yaw)

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16
Q

What does the Cage or ‘‘Caging’’ knob of a attitude indicator do?

A

Resets the gyro / attitude position

Levels it

17
Q

_______ motors are used to keep gyros rotating

A

electric

18
Q

The erection control applies for the first 3 minutes of gyro operation a ___________ to the torquer for fast erection at the start up of the gyro

A

higher voltage

(higher voltage at gyro start up to get spinning)

19
Q

A rate gyro has _____ gimbal (____ axis of freedom)

This is tied to ______ and ______

A

A rate gyro has 1 gimbal (1axis of freedom)

This is tied to yawing and precession

20
Q

An attitude gyro has _____ gimbals ( ____ axis of freedom)

this is tied to ____ and _____

based on rigidity in space

A

An attitude gyro has 2 gimbals ( 2 axis of freedom)

this is tied to pitch and roll

based on rigidity in spa

21
Q

Instead of an electric motor, you can have gyro using a ______ or ________

A

venturi or an EDP (engine driven pump)

22
Q

Explain inclination

A

Inclination is the weighted end of the compass pointer at the equator end (not the pointer end) as it tends to point inwards

23
Q

Explain Variation

A

Variation is the difference between True North and Magnetic North (Isogonic lines)

24
Q

Explain Deviation

A

Deviation is the difference between Magnetic North and Compensated North as it needs to compensate for the error in the compass caused by the electrical systems (EMI)

25
Q

The compass heading is correct if the following 3 parameters are met:

A
  1. The aircraft is horizontal
  2. There is no acceleration
  3. The reading is corrected with the deviation-chart
26
Q

The flux valve is associated with the _____ gyro

It is mounted ……

A

Directional Gyro

It is mounted in a wing tip (away from EMI)

27
Q

Lines from East to West are:

Lines from North to South are

Irelands co-ords are:

A

Lines from East to West are: Lattitude

Lines from North to South are Longitude

Irelands co-ords are: 8W 52N

28
Q

What is meant by saying a gyro must be ‘‘strapped down’’?

A

Has to be perfectly level for Gyros and accelerometers

Mod 11 2.0 (4 decks)

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