1. Obstacle Surfaces Identification
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2. ICAO Specs
ICAO Annex 14 TO THE CONVENTION ON INTERNATIONAL CIVIL AVIATION, VOLUME I, AERODROME DESIGN AND OPERATIONS,

3. Lateral Surfaces
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4. Runway
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5. Runway Strip and Runway End Safety Area
For the purposes of determining obstacles on the sides
of the runway, the Runway Strip is referenced horizontally
to the runway ends and vertically to the highest threshold on
the facility. It extends 300m (240m beyond 60m strip) from
each runway end and 150m on either side of the centerline.
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150m
300m
150m

6. 45m above the published reference elevation of the aerodrome
Transitional Surface
The transitional surfaces extend outward (perpendicular to the
centerline of each runway) from the edges of the Runway
strip 315m, at a 1:7 slope upward to a height 45m
above the published reference elevation of the aerodrome
45m above the published reference elevation of the aerodrome
Transitional
45m
1 : 7 Slope
315m
465m
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7. 45m above the published reference elevation of the aerodrome
Inner Horizontal Surface
The inner horizontal surface for each runway is defined by 2 half circles centered on the runway
ends and joined by tangents. The radii of the half circles is 4000m and the tangents are parallel to
the runway centerline at a distance of 4000m. The surface is a constant 45m above the published
reference elevation of the aerodrome
45m above the published reference elevation of the aerodrome
Inner Horizontal
4000m
4000m C L
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8. Conical Conical Surface Not to Scale C L 6100m 6100m 150m 1:20 Slope
150 m above the published reference elevation of the aerodrome
Conical Surface
Conical
The inner edge of conical surface for each runway begins at the outer edge of the inner horizontal surface. Its outer edge is defined by 2 half circles centered on the runway ends and joined by tangents. The radii of the half circles is 6100 m and the tangents are parallel to the runway centerline at a distance of m. The surfaces extend 2100 m horizontally and are sloped at a 1:20 ratio. The outer edge is 150 m above the height of the published reference elevation of the aerodrome
6100m
6100m
150m
1:20 Slope
4000m
2100m
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9. Outer Horizontal Outer Horizontal Surface C L Not to Scale 8000m 8000m
The Outer Horizontal surface begins at the outer edge of the conical surface and extends outward to a distance of 8000 m from the endpoints and centerline of the runway at a constant height of 150 m above the published reference elevation of the aerodrome C L
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10. Conical Recap of Lateral Surfaces Not to Scale C L Outer Horizontal
Inner Horizontal
Transitional
Runway Strip
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11. Approach/Departure Surfaces
15% divergence (9 Degrees)
240m min
RESA – runway end safety area
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12. Runway Strip and Clearway
For the purposes of determining obstacles on the sides of the runway,
the Primary Surface is referenced horizontally to the runway ends and
vertically to the highest threshold on the facility. It extends 300 m from
each runway end and 150 m on either side of the centerline.
For the purposes of determining obstacles in the approach/departure
zones, the horizontal and vertical point of reference is the runway Threshold
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150m
300 m
150m

13. Approach/Departure Surfaces
1:50 Surface vertical reference
is the height of the runway threshold
150m Above lowest
Runway end on airport
1:50 Slope
~8 000m
15 000m
300m
1:50 Surface horizontal reference
is 60 m from the runway end
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14. At the end of the runway
60 m
The runway and stopway is included in the runway strip
150m Runway strip C L
150m Runway strip
60 m
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15. The 1:50 Sloped surface Side view ~8 000m
If no object reaches the 2 per cent (1:50) take-off climb surface, new objects shall be limited to preserve the existing obstacle free surface or a surface down to a slope of 1.6 per cent (1:62.5).
The 1:50 Sloped surface
Side view
150 m above the lowest
approach end on the airport
First section extends to 3000m
Threshold
1:50 ( 1:62.5) Slope
Height of approach end
60 m
~8 000m
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16. At the end of the runway
150m
300m
150m
60m
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17. The 1:50 Sloped surface Not to Scale Not to Scale
150m above the lowest
approach end on the airport
150m
300m
150m
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18. At the end of the runway Side View ~8 000m 15 000m Not to Scale
150M above the lowest
approach end on the airport
Threshold
1:50 Slope
60 m
~8 000m
15 000m

19. The “flat” approach departure
surface
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150m above the lowest
approach end on the airport
150m
~8 000m
300m
150m
~15 000m

20. Approach/Departure Surfaces
1:50 Surface vertical reference
is the height of the runway end point
150m Above lowest
approach end on airport
1:50 Slope
15 000m
300m
~8 000m
1:50 Surface horizontal reference
is 60m from the runway end
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21. + Transitional
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22. + Inner Horizontal
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23. + Conical
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24. + Outer
Horizontal
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25. Obstacle Identification Surfaces
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