Non Magnetic Level
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Non Magnetic Level
Precession of Attitude Indicator....?
The DG precesses during flight and I have to periodically reset it to align with the magnetic compass.... what about the attitude indicator? Is there ever precession of the AI gyro? Likewise, what does the AI gyro use as it's level reference? Is it set up in such a way as to use the airframe as the level reference (that would make the most sense?) or does it just use the attitude it's at when it first spins up as the level reference (what if the plane is parked on a non-level surface....?)
The attitude indicator is designed to correct itself for precession. This is done with pendulous vanes. On the gyro there are four (or more) vanes attatched at the top, as the gyro tilts due to precession one of the vanes is pulled open by gravity (since it's not vertical anymore) when this vane opens it allows a small jet of air to force the gyro back toward it's upright vertical position. This allows the insrument to use gravity as a reference to continuously right itself. It also can cause errors. When your in a turn the forces cause the attitude indicator to try to 'right' itself to the turn attitude. You can see this by executing a 180 degree turn then roll out level. The attitude indicator will initially show a slight turn in the opposite direction but it will correct itself after several seconds.
Let's Play LoZ: Oracle of Seasons - Part 15: Opposites Attract