# What is an obstacle limitation surface?

## What is an obstacle limitation surface?

1.1 – The Obstacle Limitation Surfaces(OLS) are conceptual (imaginary) surfaces associated with a runway, which identify the lower limits of the aerodrome airspace above which objects become obstacles to aircraft operations, and must be reported to the Authority.

## What is obstacle height?

obstacle-clearance altitude (OCA) The lowest altitude or height above the elevation of the relevant runway threshold or the airport elevation as applicable, used in compliance with appropriate obstacle clearance criteria. An obstacle clearance height for a circling approach is referenced to the airport elevation.

## How is obstacle clearance height calculated?

The nonstandard ROC expressed in ft/NM can be calculated using the formula: (0.24 h) = (0.76 d) where “h” is the height of the obstacle above the altitude from which the climb is initiated, and “d” is the distance in NM from the initiation of climb to the obstacle.

## What is obstacle in aviation?

The Obstacle Evaluation Surfaces are additional surfaces that are applied in a defined airspace, below and beyond the OFS, to be evaluated against obstacles. 4-1 and Table 4-2) that define a surface or a set of surfaces associated with the aircraft operations (minima and approach type).

## What is OLS airport?

Obstacle limitation surface (OLS) It defines the airspace surrounding an airport that must be protected from obstacles to ensure aircraft flying in good weather during the initial and final stages of flight, or in the vicinity of the airport, can do so safely.

## What is approach surface?

Approach surface means surface longitudinally centered on the extended runway centerline and extending outward and upward from each end of the primary surface. An approach surface is applied to each end of each runway based upon the type of approach available or planned for that runway end.

## What balked landing?

A Baulked Landing, sometimes referred to as a Rejected Landing, is a low energy go-around initiated from a very low height above the runway or, potentially, even after touchdown has occurred. In virtually all cases, the go-around is initiated whilst the aircraft is in a decreasing energy state.

## What is OLS in aviation?

These Obstacle Limitation Surfaces (OLS) “define the airspace around aerodromes to be maintained free from obstacles so as to permit the intended aeroplane operations at the aerodromes to be conducted safely and to prevent the aerodromes from becoming unusable by the growth of obstacles around the aerodromes.”

## What is a 34 1 slope?

The 34:1 surface equates to the OCS slope associated with a typical 3 degree ILS glidepath. If this surface is penetrated, nothing about the approach needs to change except the required visibility, which is limited to no less than 3/4 SM.

## What is an obstacle departure procedure?

“Obstacle departure procedures or ODPs are one way to depart an airport safely in IMC conditions. When an instrument approach is initially established for an airport, the need for departure procedures is assessed. The procedure designer conducts an obstacle analysis.

## What is obstacle analysis?

Obstacle Analysis is a tool that provides a systematic approach to overcoming those obstacles. Tackling road-blocks carefully and comprehensively can aid in achieving the mission of a project and in turn, satisfy customers.

## What is OLS aviation?

The OLS, or Obstacle Limitation Surfaces (OLS), are one form of protection established by the aviation industry to protect airspace that if penetrated could compromise the safety,efficiency or regularity of aircraft operations.

## How tall should an obstacle limitation surface be?

It is important to understand the Obstacle Limitation Surfaces for aerodromes within approximately 15 – 20 km of any proposed tall structures. There are examples of developments that breach Obstacle Limitation Surfaces.

## How big is an obstruction chart at an airport?

Airport Obstruction Charts (AOC) are 1:12,000-scale graphics (1:18,000-scan for Denver International DEN 9077) showing airport obstruction information, FAR Part 77 surfaces, runways, taxiways and apron areas, air navigation facilities, and selected planimetric details.

## How is the height of an obstacle determined?

The height of the surface is continuous and is defined relative to the lowest runway threshold at the aerodrome. A conical surface extends outwards from the edge of the inner horizontal surface described above. The figure below shows a plan view of an inner horizontal surface – not drawn to scale.

## What does obstacle limitation surface mean in AIS?

Obstacle Limitation Surfaces Defines “Obstruction to Air Navigation.” Defines “Imaginary Surfaces.” Requires notice to AIS Obstacle Limitation Surfaces Assumes that the aircraft is operating normally Provides volumes of airspace around and above an airport for an aircraft in normal flight Obstacle Limitation Surfaces Obstacle:

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