SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/ifr-back-course-reverse-sensing

Flying an ILS back course inbound without reverse sensing, which way do you steer to correct?

Steer opposite the needle deflection.

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  1. Toward the needle
  2. Toward the glideslope
  3. Opposite the needle deflection ✔

Why: Without reverse sensing, the localizer needle gives reversed indications on a back course. You steer away from the needle's deflection to get back on course.

Huh, didn't know that: The back course is the localizer course along the extended runway centerline in the opposite direction to the front course.

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The back course is the pilot's version of a U-turn lane.
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References

Answer: Opposite the needle deflection. Without reverse sensing, the localizer needle gives reversed indications on a back course. You steer away from the needle's deflection to get back on course.

  1. FAA Aeronautical Information Manual 1-1 Navigation Aids www.faa.gov/air_traffic/publications/atpubs/aim_html/chap1_section_1.html
    it is necessary to steer the aircraft in the direction opposite the needle deflection
    Checked 2026-10-10.

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