two degrees of freedom, and an automatic erection system attempts to align its rotor spin axis with the

 two degrees of freedom, and an automatic erection system attempts to align its rotor spin axis to the local

one degree of freedom, and an automatic erection system attempts to align its rotor spin axis to the local

one degree of freedom, and an automatic erection system attempts to align its rotor spin axis with the

2,3, 4 and 6.

1, 3, 4 and 5.

1, 2, 5 and 6.

1, 2, 3 and 4.

After an aircraft has passed through a severe electrical storm or has been struck by lightning.   

After any of the aircraft radio equipment has been changed due to unserviceability.   

Whenever an aircraft carries a large freight load regardless of its content.   

Before an aircraft goes on any flight that involves a large change of magnetic latitude.   

The movement of the gyro spin axis along the horizontal plane.

The wander caused by movement of the aircraft.

The movement of the gyroscopic position about the vertical axis as observed by a person standing on the

The shift in position caused by imperfections in the design of a gyroscope.

periodically wander (as much as 15 km every year).   

is the same as the geographical poles.   

is static in time with respect to the geographical poles.   

is static in time.   

with a Flight Director Indicator.

combined with a directional gyro.

whose scale shows attitude commands.

that shows pitch, roll, and yaw angles

forces are along the normal axis.

forces are along the lateral axis.

forces are along the aircraft pitch axis.

forces are through the gravitational center.

Apparent wander.

Real wander.

Earth rotation error.

Transport wander.

VMO

VNE

The higher of VNE and VMO.

The lower of VNE and VMO.

a gyromagnetic indicator.

a directional gyro indicator.

an air driven artificial horizon.

a strap down inertial system.