The Artificial Horizon Flashcards

1
Q

What type of gyro does the AH use?

A

Earth gyro

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2
Q

In what axis is the AH gyro?

A

Vertical axis gyro

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3
Q

When considering the artificial horizon, the freedom of rotation about the lateral axis, inner gimbal, is how much?

A

55 degrees either side of the horizon

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4
Q

When the aircraft initiates bank, what are the movements of the inner and outer gimbals?

A

No movement, the inner and outer gimbals remain fixed to the true horizontal/vertical. Only the instrument case, the angle of bank scale and the miniature aircraft rotate about the aircraft’s longitudinal axis.

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5
Q

Movement of the outer gimbal indicates?

A

Roll

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6
Q

Movement of the inner gimbal indicates?

A

Pitch

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7
Q

Pendulous error during acceleration will result in a false?

A

Right bank indication

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8
Q

Pendulous error during deceleration will result in a false?

A

Left bank indication

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9
Q

Erection error during deceleration will result in a false?

A

Descent indication

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10
Q

RPM of the electrical artificial horizon?

A

22 000rpm

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11
Q

The electrical artificial horizon is held to the true vertical by?

A

torque motors controlled by mercury levelling switches

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12
Q

During a 360 degree turn, at what point will turning error be maximum?

A

At 180 degrees into the turn, thereafter reducing to zero

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13
Q

The RPM of a suction AH?

A

15 000 RPM

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14
Q

AH turning errors:

Turning through 90°:

Turning through 180°:

Turning through 270°:

Turning through 360°:

A

AH turning errors:

Turning through 90°: Under reads bank angle; Pitch error – indicating a climb

Turning through 180°: Bank angle correct; Pitch error – indicating a climb (maximum pitch up error)

Turning through 270°: Over reads bank angle; Pitch error – indicating a climb

Turning through 360°: Bank angle correct; Pitch correct

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15
Q

The layout of the vanes viewed from above, and the direction rotation of the gyro?

A

Top and bottom vanes are to the right, left vane at the top and right vanes and the bottom.

Anti-clockwise

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15
Q

Erection error during acceleration will indicate:

A

A false climb

16
Q

Air-driven AH gyro: kept in the vertical by

Electrical AH gyro: kept in the vertical by

A

pendulous vanes/air jets

two mercury switches sending signals to torque motors

17
Q

The attitude display consists of a miniature aircraft shape or ‘gull-wing’ (tail view) painted or
engraved centrally on the inside of the glass face of the instrument, and therefore fixed to the instrument case and the -

Behind this representation of the aircraft is the horizon bar, linked to the gyro in such a way that the bar is gyro-stabilized parallel to the -

A

actual aircraft

True horizon

18
Q

With older designs, typical limits are ± __° in pitch and ___° each way in roll.

In modern instruments there is _______ freedom in roll and up to __° (plus or minus) in pitch

A

With older
designs, typical limits are ± 60° in pitch and 110° each way in roll.

In modern instruments
there is complete freedom in roll and up to 85° (plus or minus) in pitch

19
Q

During normal coordinated turns, what error due to precession should you observe when rolling out to straight and level flight from a 180° steep turn to the right?

A
The miniature aircraft would show a slight descent and wings level attitude

B
A straight and level coordinated flight indication

C
The miniature aircraft would show a slight turn indication to the left

A

C

The miniature aircraft would show a slight turn indication to the left

20
Q

The characteristics of the gyroscope used in a gyromagnetic compass system are:

A
one degree of freedom, whose axis is maintained in the direction of the local vertical by an erecting system

B
two degrees of freedom, whose axis is maintained in the direction of the local vertical by an erecting system

C
two degrees of freedom, whose horizontal axis corresponding to the reference direction is maintained in the horizontal plane by an erecting system

D
one degree of freedom, whose horizontal axis is maintained in the horizontal plane by an erecting system

A

C
two degrees of freedom, whose horizontal axis corresponding to the reference direction is maintained in the horizontal plane by an erecting system

21
Q

The heading read on the dial of a directional gyro is subject to errors, one of which is due to the movement of the aircraft. This error…

A
is dependent on the ground speed of the aircraft, its true track and the latitude of the flight

B
is at its greatest value when the aircraft follows a meridional track

C
shows itself by an apparent rotation of the horizontal axis of the gyroscope which seems to turn at 15° per hour to the right in the northern hemisphere

D
is, in spite of this, insignificant and may be neglected

A

A

is dependent on the ground speed of the aircraft, its true track and the latitude of the flight

22
Q

The heading read on the dial of a directional gyro is subject to errors, one of which is due to the movement of the aircraft. This error…

A
is dependent on the ground speed of the aircraft, its true track and the latitude of the flight

B
is at its greatest value when the aircraft follows a meridional track

C
shows itself by an apparent rotation of the horizontal axis of the gyroscope which seems to turn at 15° per hour to the right in the northern hemisphere

D
is, in spite of this, insignificant and may be neglected

A

A

is dependent on the ground speed of the aircraft, its true track and the latitude of the flight

23
Q

The flux valve of a gyromagnetic compass:

1 - feeds the error detector

2 - feeds the direct indicating compass

3 - gives the earth’s magnetic field direction

The combination regrouping all of the correct statements is:

A
1, 3

B
2, 3

C
3

D
1, 2

A

A
1, 3

Remember FEAT