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

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

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

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

2,3, 4 and 6.

1, 2, 5 and 6.

1, 3, 4 and 5.

1, 2, 3 and 4.

that shows pitch, roll, and yaw angles

with a Flight Director Indicator.

combined with a directional gyro.

whose scale shows attitude commands.

a directional gyro indicator.

a strap down inertial system.

a gyromagnetic indicator.

an air driven artificial horizon.

Transport wander.

Earth rotation error.

Real wander.

Apparent wander.

forces are along the aircraft pitch axis.

forces are along the normal axis.

forces are along the lateral axis.

forces are through the gravitational center.

The higher of VNE and VMO.

The lower of VNE and VMO.

VNE

VMO

The gyroscopic unit.

The magnetic compass.

The flux detection unit.

The deviation card.

6°E

4°E

4°W

6°W

electronically sense the horizontal component of the Earth's magnetic field.

nothing.

electronically sense the vertical component of the Earth's magnetic field.

sense the horizontal and vertical components of the Earth's magnetic field.