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Full scale deflection on the localiser corresponds to a course width of about

  • A.Plus and minus 0.7 degrees
  • B.Plus and minus 35 degrees
  • C.Plus and minus 2.5 degrees
  • D.Plus and minus 10 degrees

Answer: C

Correct answer: Plus and minus 2.5 degrees

Full scale localiser deflection corresponds to about \( \pm 2.5 \) degrees, giving a total course sector of roughly 5 degrees. In practice the sector width is adjusted for each installation so that it subtends about 700 feet at the threshold, which means a longer runway gets a narrower angular sector.

The glide path is far finer, at about \( \pm 0.7 \) degrees full scale. That difference matters in the cockpit: a given needle deflection represents a much smaller angular error vertically than laterally, which is why the glide path demands the more careful handling.

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