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4 juillet 2016 - Transports

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January 2016 - DSNA’s ILS rationalisation Plan

14 janvier 2016 (mis à jour le 20 juillet 2016)

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.

Click here for the French PBN plan.

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.


There are two types of Approach Procedure with Vertical guidance, APV/SBAS (Satellite Based Augmentation System) and APV/Barometric Vertical NAVigation, which use different sensors to provide the vertical guidance during the approach. They are published on an approach chart entitled RNAV (GNSS) which can have several different minima lines, respectively LPV (Localiser Performance with Vertical guidance) & LNAV/VNAV minima (Lateral NAVigation & Vertical NAVigation).

Click here for the list of GNSS published procedures for DSNA’s airfields.

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 minimum ILS network


 ILS taken over by airport operators