Directional Indicator Flashcards
1
Q
A
Horizontally tied displacement gyro
2
Q
A
2 gimbals giving 2 degrees of freedom
3
Q
Dgi
A
Must be aligned every 10 mins
4
Q
HSI ( horizontal sitaution indicator)
A
It combines a DI wiht a VHF omnidirectional range instrument landing system (ILS VOR) display
5
Q
Erection system
A
Designed to keep the DI gyro horizontally tied
Slow rate of precession (3 degree/min)
6
Q
Air jet
A
Coarse erection by air jet (which acts around the spin axis)
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
8
Q
Re snych
A
Flight level and in unaccerated conditions
9
Q
Earth rate
A
Number gets smaller in norther hemisopher
