NLR-ATSI supports airports with identifying, assessing, and mitigating safety and operational risks. The needs of the customers are the starting point of every consultancy assignment.

Read more about our relevant services listed on the right or have a look at two example projects below.


Situation: A large pharmaceutical company wanted to build high rise buildings near the airport to accommodate their research laboratories. The desired height of the buildings conflicted with the appropriate Obstacle Limitation Surfaces.

Problem: The company requested to investigate what the highest possible building height at the given location would be, without affecting the safety and regularity of the operations at the airport. Also it was requested to assist in the (combined Swiss/French) regulatory process for getting approval for the proposed building height

Solution: An aeronautical study was conducted by the Safety Institute to show that protrusion of the so-called Inner Horizontal Surface would not affect the safety and regularity of the operations at the airport. All applicable instrument and non-instrument procedures were analysed to determine the maximum building height for which these procedures remain fully unaffected. Also future developments, in terms of planned new precision approach procedures have been taken into account.

Findings: It was found that the maximum allowable building height was much higher than originally expected (around 120 instead of 63 meters). This allowed the company to revise and optimise the entire building plan. Based on the study the Swiss and French authorities accepted the new building plan.

Situation: A large European airport planned to renovate one of their major runways.

Problem: The transversal slope of this (grooved) runway was less than the recommend slope given by ICAO. Due to economical reasons the existing transversal slope could not be increased. The Civil Aviation Authorities would not accept reopening of the renovated runway if this matter was not resolved.

Solution: An aeronautical study was conducted to assess the impact of the non-compliance. A number of accident scenarios related to the non-compliance were identified and analyzed. For each scenario it was examined if there was an increase in the level of risk associated with the transversal runway slope. If necessary, mitigating measures were examined and proposed to attain an equivalent level of safety.

Results: The study showed that the deviation from the ICAO recommended transversal slope introduced an increase in risk. Therefore an equivalent level of safety could not be attained without the introduction of mitigating measures. The study showed that an equivalent level of safety could be attained when the average runway groove depth was increased to a certain depth while maintaining the other groove dimensions.

Problems and solutions for wind turbine siting in the vicinity of airports, by Peter J. van der Geest

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