take-off climb surface "take-off climb surface" means an inclined plane above the take-off climb area normal to the vertical plane containing the longitudinal centre line of the aerodrome runways and-intersecting that centre line at the boundary between the aerodrome runway strips and that take-off climb area; PU(A) 358/1997 - AERODROME (CONTROL OF OBSTRUCTIONS) (KUALA LUMPUR SEPANG AERODROME) ORDER 1997 2. Interpretation.