1. Aerodrome Certification Workshop
Aerodrome Certification : Obstacles Control
Eng. Mohamed Iheb Hamdi
ICAO MID Regional Officer for Aerodromes and Ground Aids (AGA
Aerodrome Certification Workshop
Paris, France
18-20 Dec 2018

2. OLS : Obstacles Limitation Surfaces
The take-Off Climb Surface
Inner Horizontal Surface
Conical Surface
Transitional Surface
The approach Surface

3. Obstacles

4. OLS Inner horizontal Surface and Conical Surface
To protect airspace for visual circling prior to landing
Approach and Transitional Surfaces
Define the volume of airspace which should be kept clear of obstacles to protect the aircraft in the final phase of the Approach-to-Land Manoeuvre
Take-Off Climb Surface
Provide protection for aircraft taking off with respect to obstacles

5. OLS: Design (Example Code 4 _ P-APP) Transitional Surface
Runway Strip C C
Approach Surface H
Slope =14.3%
D = H / Slope
Runway Strip
C - C

6. OLS: Design (Example Code 4 _ P-APP) Inner horizontal Surface
Transitional Surface F
Inner horizontal Surface
Runway Strip
F - F

7. OLS: Design (Example Code 4 _ P-APP) Conical surfaceT T
Inner horizontal Surface
Slope= 5%
Conical Surface
Transitional Surface
T - T

8. OLS: Design (Example Code 4 _ P-APP) Approach Surface
Divergence = 15 %
1st section
2nd section
Horizontal Section
Bande
Slope2=2,5% D2 H2
H1 = D1 * slope1
H2 = D2 * Slope2
H3 = H1 + H2 H3
Slope1=2% D1 H1
B - B

9. OLS: Design (Example Code 4 _ P-APP) Take Off climb surface
Divergence=12.5 %
Runway Strip H
H = D * Slope
Slope= 1.6 %
A - A D

10. OFZ: Obstacle Free Zone

11. OFZ – Obstacle free Zone
OFZ composed of:
Inner Transitional Surface (ITS)
Balked Landing Surface
Inner Approach Surface
Surfaces intended to protect aeroplanes from fixed or mobile obstacles during category I, II or III operations when approaches are continued below decision height and during any subsequent missed approach or balked landing with all engines operating normally,
It is not intended to supplant the requirement of other surfaces or areas where these are more demanding

12. Outer Horizontal Surface
Some States Mandate a further surface :
The Outer Horizontal Surface with extends
from the periphery of the conical surface to a
radius of 15,000m from the aerodrome reference point

13. Outer Horizontal Surface