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According to ICAO Annex 14 Volume 1 (Aerodrome Design and Operations), which of the following must be frangible?

1. Fixed objects when marked by markers
2. Stopway edge markers
3. Taxiway edge markers
4. Unpaved runway edge markers

  • A

    1 and 4 only.

  • B

    2, 3 and 4.

  • C

    1, 2 and 3.

  • D
    2 and 4 only.
A runway strip is defined as an area including the runway, and stopway if provided, in which obstacles are kept to a minimum. It provides an area clear of objects that may endanger aeroplanes. Any equipment or installation required for air navigation or for aircraft safety purposes and is located in this object-free area should be frangible and mounted as low as possible.

ICAO Annex 14

5.5 Markers
Markers shall be frangible. Those located near a runway or taxiway shall be sufficiently low to preserve clearance for propellers, and for the engine pods of jet aircraft.
  • Which makes statement (3) and (4) correct.
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