When Reverse Sensing Already Is

Many pilots struggle to properly use an HSI when flying a localizer. If youre inbound to a VOR on a given course, pass the station and proceed outbound, you dont change the OBS, right? Likewise, when outbound on a localizer, dont change the OBS, HSI or not. So, similarly, if youre flying the front course-inbound or past the runway-you select the front course by convention for situational awareness, even though a localizer doesnt care where the OBS is.

Frank Bowlin

Thursday, June 25, 2015 at 12:00 AM ET

Verified

Key Takeaways:

When flying a localizer front course, set the HSI to the front course for situational awareness.
For a localizer back course, set the HSI course selector to the *front course* of the runway; the HSI's visual display will automatically provide reverse sensing, guiding you to steer *toward* the CDI for corrections.
Despite the HSI's visual reverse sensing for back courses, autopilots still require activation of their dedicated "back course" mode.

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Many pilots struggle to properly use an HSI when flying a localizer. If you’re inbound to a VOR on a given course, pass the station and proceed outbound, you don’t change the OBS, right? Likewise, when outbound on a localizer, don’t change the OBS, HSI or not. So, similarly, if you’re flying the front course—inbound or past the runway—you select the front course by convention for situational awareness, even though a localizer doesn’t care where the OBS is.