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In terms of the flight method used to conduct an approach, which type does the following definition describe?

This type of approach has lateral guidance only; the pilot must calculate a rate of descent and normally use a Continuous Descent Final Approach (CDFA) method.

  • A
    2 D
  • B
    3 D
  • C
    Type A
  • D
    Type B

According to ICAO Annex 6 "Operation of Aircraft":

2D approaches: have lateral guidance only. The pilot must calculate a rate of descent and normally use a Continuous Descent Final Approach (CDFA) method.

3D approaches: have lateral and vertical guidance and the flight path can use a Course Deviation Indicator (CDI) and Glide Path (GP) indicator.

Type A approaches: may be either 2D or 3D operations; 2D will only have a lateral path defined for the approach operation where 3D will have both a lateral and vertical path defined for that operation. A Type A operation will permit aircraft operations down to a minimum height or altitude of 250 ft. All NPAs and APprocahes with Vertical guidance (APV) using Barometric altimetry are Type A approach operations.

Type B approaches: are 3D operations; a lateral and vertical path is defined and guidance along this path is provided either from GPS with SBAS (APV SBAS) or by a precision approach system.

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