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Refer to figure.
In the attached figure, B1 and B5 refer to which of the following lengths for a CAT I precision approach?

  • A

    15 m / 450 m

  • B

    30 m / 900 m

  • C

    30 m / 150 m

  • D

    50 m / 1200 m

Refer to figure.
Each light on a precision approach lighting system is spaced 30 m apart - B1.

The first 300 m (from the threshold, sometimes called the inner 300 m) has one "single light source" - ie one light. The second 300 m (middle) has two light sources, and the third 300 m (outer) has three light sources. An alternative is barrettes - lights put close together to look like a line (bar).

Crossbars are required at 300 m and 600 m. Additional crossbars must be provided when using single light sources as opposed to barrettes. These are required at 150 m, 450 m and 750 m.

The total length of the entire construction must be 900 m - B5.

  • B1 = 30 m
  • B5 = 900 m

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