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Airport Planning Presentation - Obstacle Limitation Surfaces

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Dan Whitaker

on 5 May 2014

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Transcript of Airport Planning Presentation - Obstacle Limitation Surfaces

Topic 40: Identify and describe the key obstacle limitation surfaces associated with a runway
Dan Whitaker
Elizabeth La Palombara

Obstacle Limitation Surfaces
Approach Surface
'Obstacle Limitation Surfaces (OLS) are a series of surfaces that set the height limits of object around an aerodrome. Objects that project through the OLS become obstacles.' (CASA 1999)
Conical Surface
Inner Horizontal Surface
For a non instrument runway, the following OLS apply:
Conical Surface
Inner Horizontal Surface
Approach Surface
Transitional Surface
Take-off Climb Surface
For a precision instrument runway, the following additional OLS apply:
Outer Horizontal Surface
Inner Approach Surface
Inner Transitional Surface
Baulked Landing Surface

(CASA 1999)
Take-off Climb Surface
Outer Horizontal Surface
Inner Approach Surface
Baulked Landing Surface
Inner Transitional Surface
'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. '
(MoS, Part 139,

Transitional Surface
(CASA 2012)
(Adapted from ICAO, 2012)
What is a baulked landing?
CASA defines it as:
A 'baulked landing, for an aircraft, means an attempted landing that is
abandoned during:
(a) for an aeroplane—the final approach stage of the flight; or
(b) for a rotorcraft—the landing manoeuvre for the flight.'
(CASA 2012)

Baulked Landing Surface

(a) The baulked landing surface is an inclined plane originating at a specified distance after the threshold and extending between the inner transitional surfaces.

(MoS, Part 139,

"(a) The approach surface is an inclined plane or combination of planes which originate from the inner edge associated with each runway threshold, with two sides originating at the ends of the inner edge.

(b) The inner edge associated with each runway threshold has a specified length, and is located horizontally and perpendicularly to the runway centre line, at a specified distance before the threshold.

(MoS, Part 139,
(MoS, Part 139,
"(a) The conical surface comprises both straight and curved elements,
which slope upwards and outwards from the edge of the inner
horizontal surface to a specified height above the inner horizontal
(MoS, Part 139,

CASA, "Chapter 10 - Obstacles in Airspace," CASA 1999

CASA, 'Civil aviation Legislation Amendment Regulation Definitions 2012," CASA 2012

COSCAP, 'Aerodrome design and operations' http://cfapp.icao.int/fsix/_Library/Manual%20Aerodrome%20Stds.pdf

AERONAUTICAL SERVICES ADVISORY MEMORANDUM, 1999 Irish Aviation Authority (En Route Obstacles to Air Navigation) Order 1999,

ICAO/FAA Airport Certification Workshop for the Caribbean Region, Obstacle Limitation Surfaces, Workshop notes http://www.icao.int/NACC/Documents/Meetings/2012/ICAOFAAAGACertification2012/ICAOFAACertification15.pdf

Obstacle Free Zone
OLS Dimensions
"An obstacle is defined as:
(a) any object that stands on, or stands above, the specified surface of an obstacle restriction area which comprises the runway strips, runway end safety areas, clearways and taxiway strips; and

(CASA MoS Part 139,
(MoS, Part 139)
Inner Horizontal Dimensions
(a) in the case of an aerodrome with a single runway, semi-circular curves of a specified radius centered on the middle of each of the runway strip ends and joined tangentially by straight lines on each side of the runway, parallel to the runway centerline;
(b) in the case of an aerodrome with multiple runways, curves of a specified radius centred on the middle of each of the runway strip ends and the curves are joined by a tangential line as two curves intersect.
4.1.17 Description.C Inner transitional surface. A surface similar to the transitional surface but closer to the runway. The slope of this surface is measured by a vertical plane at right angles to the centre line of the runway.

Inner Transitional slopes are defined as
a) 40% - precision approach runway catagory I : Code 1 or 2
b) 33.3% - precision approach runway catagory I, II or III, Code 3 or 4.
MOS 5.10.2 The inner approach surface originates from an inner edge of a specified length, at the same location as the inner edge for the approach surface, and extends on two sides parallel to the vertical plane containing the runway centreline, to an outer edge which is located at a specified distance to the inner edge and parallel to the inner edge.
3.8.1 An OFZ is intended to protect aeroplanes from fixed and mobile objects during category I, II and III landings when approaches are continued below decision height and during any subsequent missed approach with all engines operating normally (a balked landing). It is not intended to supplant the requirement of other surfaces or areas where these are more demanding. Outer Horizontal Surface. The outer horizontal surface is a plane located 150 m above the reference elevation datum and extending from the upper edge of the extended conical surface for a distance of 15,000 m (radius) from the aerodrome reference point (ARP).
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