Directional Indicator Flashcards

1
Q
A

Horizontally tied displacement gyro

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2
Q
A

2 gimbals giving 2 degrees of freedom

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3
Q

Dgi

A

Must be aligned every 10 mins

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4
Q

HSI ( horizontal sitaution indicator)

A

It combines a DI wiht a VHF omnidirectional range instrument landing system (ILS VOR) display

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5
Q

Erection system

A

Designed to keep the DI gyro horizontally tied
Slow rate of precession (3 degree/min)

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6
Q

Air jet

A

Coarse erection by air jet (which acts around the spin axis)

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7
Q

Wedge plate

A

Fine erection by wedge plate ( which acts around the inner gimbal)

In order to provide the short term accuracy of heading changes

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8
Q

Re snych

A

Flight level and in unaccerated conditions

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9
Q

Earth rate

A

Number gets smaller in norther hemisopher

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