In certain situations, non-compliance with ICAO regulations cannot be avoided. Aeronautical studies are therefore necessary to ensure that the safety of flight operations has not been compromised.
An aeronautical study is an analysis and assessment of the safety of all flight operations at an aerodrome in relation to other operational processes. It consists of following steps :

• System description
• Hazard analysis
• Risk analysis
• Combined overall assessment of contributing risk factors and possible solutions