They provide at least 1000ft clearance over obstacles within 25NM of the homing facility.

A line of shortest distance between two points on a sphere.

Lift is the component of the total aerodynamic force perpendicular to the relative airflow.

Lift is generated when a streamlined body, such as an aerofoil, is placed in a flow of air.

NDB errors:

Interference from other NDB’s

• Static, especially near thunderstorms

• Night effect Coastal refraction

• Mountain effect

• Aircraft quadrantal error

To monitor the flight management and aircraft control actions of the Pilot Flying and carry out support duties such as communications and check-list reading.

Taxi, trip, contingency, reserve and extra fuel.

A moving stabilator allows for wider operating range of the control surface, which is of great importance in aircraft with a large range of operating speeds.

Compared to a fixed horizontal stabilizer, when trimmed, the moving stabilitor will produce less drag, reducing fuel consumption.

A line of latitude.

Mach tuck is a nose-down pitching moment experienced as an aircraft passes Mcrit.

Mach tuck is a form of longitudinal instability that is caused by the centre of pressures rearward movement (caused by the shock wave) behind the centre of gravity.

You can go through a DA, but not a MDA.

A Decision Height, used in precision approaches, defines the point where a go around should be performed. It accounts for the altitude loss during the initial seconds of the go around maneuver.

The MDA does not account for this and assumes the pilot will never go below this altitude. When performing a CDFA most operators establish a Derived Decision altitude (DDA) to account for the extra lost altitude.