Interpret readings on an aircraft course and DME indicator.

Interpretation should include the following:

  • The course deviation indicator (CDI) is found in most training aircraft.
  • It consists of an omnibearing selector (OBS), sometimes referred to as the course selector; a CDI needle (left-right needle); and a TO/ FROM indicator.
  • The course selector is an azimuth dial that can be rotated to select a desired radial or to determine the radial over which the aircraft is flying.

PLT087

Process/Skill Questions: 

  • What is a CDI, and how is it used?