[...]
The outer surface, shown on Earlton Airport Zoning Plan No. 54-090-83-158, Sheets 1 to 9, dated June 26, 1984, is an imaginary surface located at a common plane established at a constant elevation of 45 m above the assigned elevation of the airport reference point except where that common plane is less than 9 m above the surface of the ground, in which case the imaginary surface is located at 9 m above the surface of the ground.
[...]
