January 2016 - DSNA’s ILS rationalisation Plan
Moving from ILS to PBN
By the beginning of year 2016, DSNA will have completed its ILS rationalisation plan. This plan is based on a simultaneous and ambitious deployment program of GNSS procedures for all IFR runway ends in France and overseas territories.
Indeed, satellite navigation technologies (GPS and EGNOS, the European satellite based augmentation system) make it possible to conduct landings without navigational aids on the ground, and at a lower cost (the signals being provided free of charge). To maintain the level of accessibility of small and medium sized airports, GNSS procedures are implemented to replace the legacy ILS (Instrument Landing System). Nowadays, approaches following RNAV procedures and particularly Approach Procedures with Vertical guidance (APV) have shown performance close to ILS CAT I.
DSNA, the leading european provider in the implementation of satellite based procedures.
APV with Localizer Performance with Vertical guidance (LPV) minima are precision satellite-based instrument approach procedures. They don’t require specialised aircrew training. The advantages of implementing APV/LPV can be measured in terms of
- improved safety (vertical guidance on final approach)
- regularity of service (reduction of operational minima),
- levels of accuracy and integrity obtained in comparison to the legacy ILS CAT I.
Besides, EGNOS has just been certified by EASA (European Aviation Safety Agency) to allow 200 ft LPV minima to be achieved, thus closing the gap with ILS CAT I minima.
ILS rationalisation’s objectives
The traditional instrument landing system has high procurement costs as it requires separate localiser, glideslope transmitters and antennas for each runway end. Alongside with maintenance costs, all expenses are entirely supported by DSNA, including those of small and medium size airports.
The rationalisation of DSNA’s ILS network and its combination with GNSS procedure implementation will cut down internal costs. DSNA’s global navigational aid strategy participates in reducing terminal area air navigation charges.
A consistent and collaborative process
DSNA has defined a list of consistent criteria to identify airports where it will no longer maintain the legacy ILS. Airlines, airport operators, and representatives have been regularly consulted to reach a balanced agreement. The maximum distance between ILS equipped airports, the compulsory implementation of GNSS approaches before the withdrawal alongside with thorough meteorological studies have been taken into account in the final decision.
2016 – What to expect ?
|DSNA’s 2015 ILS NETWORK||2016 MINIMUM ILS NETWORK|
DSNA’s minimum ILS network
ILS taken over by airport operators