ICAO has developed a transition plan allowing the introduction of new technology approach and landing aids (currently MLS and GNSS). IFATCA is concerned that the more complex environment created by the use of a number of new approach aids will create operational problems for controllers. These problems can be reduced by using the principles associated with RNP in the design of operational procedures, so avoiding the need for the controller to know which aircraft is using which precision approach aid and reducing RTF.

During the last few years there has been a significant increase in the number of approach types in use. This is due in the main to the introduction of new technologies, such as Global Navigation Satellite System (GNSS) and Area Navigation (RNAV). States have introduced approach types with differing terminology and differing criteria. There is a pressing need to rationalise the multitude of approach types and to introduce consistent terminology and criteria. There are plans within ICAO to try and achieve this through the Performance Based Navigation (PBN) concept. IFATCA should support such a move. In the meantime, there are several recommendations that should be accepted to assist controllers in dealing with the various approach types.