14 / 20
An aircraft is on the 120° radial from a VOR station. Course 340° is selected on the HSI (Horizontal Situation Indicator). If the magnetic heading is 070°, the deviation bar relative to the aeroplane symbol will be:
  • A
    right
  • B
    left
  • C
    in front
  • D
    behind

Refer to figure.
This type of question is best to draw out. To start with, draw the VOR (Magnetic North up) and lines coming out of it representing the course selected on the HSI (in this case radials 340º and the reciprocal 160º - label them). The draw the aircraft on radial 120º facing direction 070º. Now we can see that the aircraft is closer to the 160 radial, which we can called the "340º TO" course, and this is what our CDI (course deviation indicator - in the middle of the HSI) wants us to follow.

As you can see in the annex above, the desired course is behind the aircraft, and therefore the deviation bar on the CDI is behind us also. You can also tilt your head to the left to see the standard course deviation indicator showing full scale "fly left" indication, which is also expected, as the HSI thinks we want to fly the "340º TO" course into the VOR, which we are to the right of.

Your Notes (not visible to others)



This question has appeared on the real examination, you can find the related countries below.