There are several cases where declared distances supplied by authoritative data differs from published values in AODB:

  1. Obstacle(s) may be present within obstacle splay within or adjacent to the clearway. In such circumstances, a reduction is made to the clearway length to one metre short of the obstacle distance.
  2. Where ASDA is shorter than TORA, TORA will be defaulted to ASDA
  3. Take Off Distance Available and Accelerate Stop Distance Available are both limited to a maximum of 1.5 times the length of TORA


If there are any questions as to any operational limitations, please submit a request via the support portal through the N-Performance (AODB/ToDC) link.