T-45C TS, ADV & IUT ENG-24
GINA Operating Characteristics
b.
3-axis (XYZ) gyro maintains a precise inertial
coordinate orientation during all movement
INSTRUCTOR NOTES
“Inertial coordinate orientation” means that a gyroscope
maintains an orientation towards a point in space rather than
towards a point on earth. That stability attribute makes gyros
suitable for use anywhere on earth; polar regions, as well as
mid-lattitudes. Additionally, that attribute allows gyros to be
used for navigation in space.
3.
Provides a stable platform for an attitude reference
system
4.
Real precession
a.
Caused by friction
(1) Due to extreme G-forces
(2) Due to lack of effective lubricant
(3) Due to wear
b.
Changes a stabilized gyro’s inertial coordinate
orientation
c.
Can be caused by intentional force applications
(1) To compensate for apparent precession
(2) To keep the gyro platform “level” with
earth’s surface
5.
Apparent precession
Sg 1, fr 3
Fig 2: Earth-Rotation
a.
Two types
Apparent Precession
(Aircraft Stationary)
(1) Earth-rotation (earth rate): transport of the
gyro by the earth’s rotation causes the spin
axis to appear to shift
Original (9-98)
Page 24-4
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