Hi arrow28,
Airbus produced a document "getting to grips with aircraft performance". It tabulates the distance used (for each aircraft type) in turning through 90 degs in order to line up. That distance must be considered for performance calculation.
"3.2.4. Loss of Runway Length due to Alignment
Airplanes typically enter the takeoff runway from an intersecting taxiway. The airplane must be turned so that it is pointed down the runway in the direction for takeoff. FAA regulations do not explicitly require airplane operators to take into account the runway distance used to align the airplane on the runway for takeoff. On the contrary, JAA regulations require such a distance to be considered:
JAR-OPS 1.490 Subpart G
IEM OPS 1.490
“JAR-OPS 1.490
(c)(6) […] an operator must take account of the loss, if any, of runway length due to alignment of the aeroplane prior to takeoff.” "
Last edited by rudderrudderrat; 18th June 2011 at 12:12.
Reason: formatting