→Directional Gyro: Complete merge
=== Directional Gyro ===
Gyro of default Cesna| right]]
The name of this instrument describes the 2 essential parts of its characteristics:
* it can be set to point to the geographic north pole, not of the magnetic pole as the magnetic compass does.
* it does not have the tendency to lag behind or ahead while turning, as the
magentic compass does.
* it is not subject to magnetic influences. The magnetic compass can point in a slightly off direction due to heavy metal objects on or near the aircraft.
* It is heavier than a magnetic compass
* It requires a source of power, either electricity or vacuum. If the power source fails, the DG will fail. Because the gyro spins down slowly, it will
slowy drift off heading. If the pilot does not notice that the vacuum or elctrical system has failed, he may not realize that the DG has failed. This can lead a pilot off course.
* Gyros precess over time, and must be periodically realigned with the magnetic compass, usually every fifteen minutes.
* Turbulence or
maneuvering can "tumble" the gyro, resulting in wildly erratic readings .
=== Attitude Indicator ===