Aircraft Navigation System

Aircraft Navigation System

For Basic Aircraft Maintenance (BAM) Training

By: Hardi Nata

Multiple Choice

Which instrument will become inoperative if the pitot tube becomes clogged?

• Airspeed Indicator

• Altimeter

• Vertical Speed Indicator

• Cabin Altitude Indicator

Multiple Choice

When an aircraft altimeter is set at 29.92" Hg on the ground, the altimeter will read

• Density altitude.

• True altitude

• Pressure altitude

• Ground Altitude

Directional Gyro (DG) is a navigation instrument that provides information about the heading or direction of the aircraft based on the gyroscopic principle.

Unlike magnetic compasses that are susceptible to disturbances from the earth's magnetic field and unstable aircraft movements, DG provides a more stable and accurate heading.

​Directional Gyro Indicator

The main problem is that this instrument has no inclination to find the Earth's magnetic north, so it must be manually adjusted to match the magnetic compass every 15 minutes while the aircraft is in straight and level flight.

Multiple Choice

When swinging a magnetic compass, the compensators are adjusted to correct for ...

• magnetic variations

• magnetic deviation

• damping compensation

• compass card oscillations