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Given the following information, where does the HSI course deviation bar appear?

Heading: 160°
VOR radial: 240°
Selected course: 250°

  • A
    Behind the aeroplane symbol with the FROM flag showing.
  • B
    Ahead of the aeroplane symbol with the FROM flag showing.
  • C
    Behind the aeroplane symbol with the TO flag showing.
  • D
    Ahead of the aeroplane symbol with the TO flag showing.

Refer to figure.
The HSI gives a pictorial representation of the navigational position of the aircraft with reference to a selected course.

In this case, the selected course is 250º, which equates to a 10º displacement from the current radial 240º.

Now, if the aircraft was flying away from the station, along radial 240º, the CDI needle would be fully deflected to the right. This would indicate that the selected radial was located to the right of the aircraft.

However, the aircraft is actually following a heading of 160º, which means that the selected course is behind the aircraft. Therefore, the CDI indicator should be displaced behind the aircraft symbol in the instrument.

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