[MrPeaBody]

A Little Perspective or a Lot of Stupidity

From the 139 MOS.

“The transitional surface comprises inclined planes that originate at the lower edge from the side of the runway strip (the overall strip), and the side of the approach surface that is below the inner horizontal surface, and finishes where the upper edge is located in the plane of the inner horizontal surface.

The transitional surface slopes upwards and outward at a specified rate and is to be measured in a vertical plane at right angles to the centreline of the runway.”

My understanding for the Essendon runways is that you project a line at 14.3 degrees at right angles to the runway centreline to an altitude of 45 metres (the inner horizontal surface). This line is labelled as the Transitional Line.

The transitional surface is then the sloping plane between the edge of the air strip and the transitional line. According to the MOS “The transitional surface should be used for building height control.”




So what's happening at the other end.