CASTLEBERRY Instruments & Avionics
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Document: 0052-1001-0001 Page 3 of 4 Revision B
Figure 1
Observe Figure 1 for description of features as follows:
1. Parallax Adjustment Knob is used to set the Parallax Indicator (item 2) reference on the actual gyro horizon
after settling as viewed by the pilot. Aircraft engines should be on during this process to apply nominal
operating voltage to gyro and to generate the required vibration to overcome static friction to simulate a
real operating environment. Normal operation would be to turn gyro on and allow for gyro to spin up till
flag (item 6) hides out of view, then perform a caging operation (explained for item 8) and then allow gyro
a few minutes to settle to level. The gyro is settled when both pitch and roll indications remain constant.
The Parallax may be set on ground when the aircraft is level as it would be in a trimmed straight and level
flight or set in air during straight and level trimmed flight with wingtips and pitch reference on the earth’s
horizon.
At this time the Parallax Adjustment knob should be set so that at the pilots viewing angle of the Parallax
Indicator rests centered on the horizon line of the Pitch Dial (item 3). Once the parallax is set it is
generally not changed again unless the pilot’s seat has moved or a different height pilot requires a different
viewing angle.
2. This is the Parallax Indicator. Purpose and operation is described in paragraph 1 which is the adjustment
that sets the position of this item.
1. Parallax
2. Parallax
6. Gyro Flag
8. Caging
