Aviation Consulting & Engineering Solutions for Airports
Objects that violate the restrictive surfaces of the airports called obstacle. Haritaevi is expert in obstacle analyzes!
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Airports should be assessed not only by the land they occupy but also by the airspace they occupy.

Each airport also occupies an airspace besides the runways and the terminal areas. The airspaces that are regulated by flight traffic and airport type form some restrictive surfaces. Objects that violate these surfaces (buildings, towers, etc.) are called obstacles.


Obstacle criteria differ for each airport, but the main basis is international and national aviation legislation.

The Directorate General of Civil Aviation under Republic of Turkey Ministry of Transport determines its Obstacle criteria according to the criteria defined by the ICAO (International Civil Aviation Authority). These criteria vary specific to the airport and according to the location of the obstacle around the airport. However, the assessment criteria are essentially “Obstacle Plans” in the first stage.


The airspace around an airport must be free of obstacles. Different and highly detailed obstacle criteria are available; however, the first criterion that restricts obstacles around the airport and protects the airspace is Obstacle Plans prepared according to ICAO Annex 14 standards. In addition, there are many legislations such as ICAO Doc. 9859 regarding flight safety, ICAO Doc.8168 PANS-OPS regulating the flight procedures, and Euro Doc. 15 regarding navigational auxiliary electronic devices used at the airports.
Obstacle Plans consist of surfaces defining the height limits around the airport. They refer to all structures in the area in which they are valid.


Nowadays, aviation is a sector where navigation is planned and performed electronically. Moreover, service providers and end users, especially those involved in civil aviation, are obviously all connected 24/7 via web pages and mobile applications and they exchange information.

Obstacle Limitation Surfaces drawn up to the ICAO standards are clearly absolute assessment criteria for municipalities, project developers, field owners and citizens that prepare constructions plans and construct buildings in the vicinity of an airport. It is a critically intersectional issue for aviation and real-estate sectors to determine the permissible height of a building to be constructed in the vicinity of an airport. The surface coating, frontal texture and position of any structure in the vicinity of an airport are also extremely important issues to be analyzed for electronic and communication systems of aircraft.

Haritaevi carries out analyses with the following motto: “Cities growing safely, aviators flying safely.” We use a safety-oriented approach in our engineering analyses. Moreover, we make our analyses available to end users via our web pages, portals in a form which does not require any technical knowledge. We develop software and integrations for use of obstacle analysis results in the form of web services, apis, etc. by professionals, Civil Aviation Authorities or bodies such as municipalities. By this means, we help service providers offer transparent governance services right away.