On 16 November 2010, the “Collaborative Decision Making” system (CDM) recommended by Eurocontrol came into operation, the culmination of a process which started in 2005 involving the whole airport community working together on the same project: sharing real-time information in order to ensure traffic flows smoothly at Paris-Charles de Gaulle in normal and difficult situations.

The stakeholders are all involved in varying degrees, through their decisions or actions, in the airport traffic flow management. Within this context, it became clear that everyone should belong to a CDM system to improve not just the local operation of Paris-Charles de Gaulle but also its integration into the European air network.

To enable CDM to be implemented at Paris-Charles de Gaulle, all airline partners, the airport operator and air traffic control have developed a culture of sharing information on the airport site as well as common tools and procedures on the following themes:

  1. sharing of information and operational collaboration between stakeholders
  2. setting up collaborative pre-departure sequencing
  3. optimising capacity in normal situations
  4. management of adverse conditions.

Operational collaboration

At Paris-Charles de Gaulle, operational collaboration is present in normal conditions and stepped up in adverse situations: it takes place in real time as well as non-real time during joint feedback.

In normal situations, collaboration between stakeholders takes place with two daily updates at 12.40 p.m. LT and 7.30 p.m. LT. These telephone meetings are held between the Operations Manager of the Aeronautics Areas of Aéroports de Paris, the Head of the Air Navigation Services System and the Air France Operations Manager of Air Operations Control Centre, and their conclusions are systematically available on this CDM website a few minutes after the meetings finish.

When there are adverse conditions, the operational stakeholders decide to meet up in a dedicated decision-making room: the CDM base. Its main purpose is to improve communication between the stakeholders to facilitate joint analyses and decision-making.

The CDM base is equipped with 16 stations to accommodate Aéroports de Paris staff, from air traffic control, airlines or assistants.

It is also fitted with a monitor wall enabling, for example, traffic indicators or even weather forecasts to be displayed, essential information when there are icy conditions.

Finally at Paris-Charles de Gaulle, collaboration between the various organisations also takes place after the event, during monthly operations meetings where all the line managers are invited to discuss past situations and, if necessary, suggest improvement priorities.

Collaborative pre-departure sequencing (PDS)

The collaborative pre-departure sequence is a set of tools and procedures which allows a sequence of outbound flights to be created at Paris-Charles de Gaulle available in normal and adverse conditions.

The collaborative pre-departure sequence tool calculates a realistic off-block departure schedule for each flight which takes into account the COHOR programming (Schedule Coordination Association at Paris-Charles de Gaulle), the outbound slots allocated by the Network Manager (European organisation for central flow management) and all the restrictions which may apply to the flight: runway capacity, weather conditions, airline requirements.

This sequence is automatically shared with the European network operator which enables better integration of Paris-Charles de Gaulle operations and their preferential treatment : the operator imposes fewer restrictions on flights from a CDM airport and flight punctuality is improved.

The collaborative pre-departure sequence system also guarantees good ground traffic flow, reduced taxiing times and reduced waiting time at threshold particularly during high peaks in traffic. This has created sizeable operational and environmental benefits at Paris-Charles de Gaulle:

  1. improved security
  2. improved punctuality
  3. a reduction in fuel consumption and greenhouse gas emissions : waiting times at the runway threshold are controlled as waiting at the parking positions with engines off is preferred.

In 2011, Paris-Charles de Gaulle made savings amounting to 9 tonnes of fuel per day or 32 tonnes of CO2.

Collaborative pre-departure sequencing and other information on operations at Paris-Charles de Gaulle are available on the website. Register now if you are a Paris-Charles de Gaulle line manager    Request for account creation