A section of the runway that is exactly one third of the runway length. The runway sections are named A, B and C. Section naming starts at the lowest runway name (number).
Legal values
'A'
'B'
'C'
Comments
Example: For runway 18/36 the A-section shall be the third that is in the north end (nearest threshold 18). For runway 01/19 the A-section shall be in the south end (nearest threshold 01). “