If ATC instructs you to intercept the selected radial north of the station, which HSI indicates compliance with this clearance?

To determine compliance with the instruction to intercept the selected radial north of the station, understanding how a Horizontal Situation Indicator (HSI) works is essential. The HSI has a compass rose that displays the aircraft’s current heading, along with the selected course or radial from a VOR station.

When you are instructed to intercept a specific radial, the correct HSI indication would show the selected radial aligned with your desired course. Specifically, for an approach towards a radial north of the VOR station, the selected radial should be shown to the top of the HSI frame (which indicates north).

In this scenario, if option C represents an HSI configuration where the selected radial is correctly oriented towards the north of the station, it confirms that you are properly aligned to comply with the ATC instruction. The setup would typically show the selected radial as either a solid or dashed line pointing directly upwards on the instrument, along with your aircraft symbol on course or prepared to intercept the radial coming from north of the VOR.

Each of the other options would not show the correct alignment towards north of the station for the selected radial, leading to the conclusion that they do not indicate compliance with the ATC instruction. Thus, option C correctly reflects the scenario of intercepting