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Which of the following alternatives describes the complete CAT 1 ('Calvert') type of approach light system?
  • A
    3 crossbars, centre line with 3 or 2 lamps per light unit
  • B
    5 crossbars, centre line with 3, 2 and 1 lamp per light unit
  • C
    3 crossbars, centre line with 3, 2 or 1 lamp per light unit
  • D
    4 crossbars, centre line with 3 or 2 lamps per light unit
Refer to figure.
The Calvert system consists of a white centreline and 5 white cross bars. It commences 900 m prior to the runway threshold.

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