# Commission Implementing Regulation (EU) 2019/123 of 24 January 2019 laying down detailed rules for the implementation of air traffic management (ATM) network functions and repealing Commission Regulation (EU) No 677/2011 (Text with EEA relevance), Division 6: The Secretary of State must endeavour to:

Extent: E+W+S+N.I.

(a)optimise the overall performance of the UK ATMS through planning, coordination and implementation of agreed ATFM measures, including for transition plans for the entry into service of major airspace or ATM systems improvements and for adverse weather, through cooperative decision-making;
(b)consult operators on the definition of ATFM measures;
(c)conclude working arrangements with the local ATFM units;
(d)ensure the development, availability and effective implementation of ATFM measures (for all ATFM phases), together with local ATFM units; when such ATFM measures have a wider network impact, the Secretary of State must endeavour to establish, through cooperative decision-making, the nature of the ATFM measures to be implemented;
(e)in coordination with local ATFM units, identify alternative routings to avoid or alleviate congested areas, taking into account the overall performance of the UK ATMS;
(f)offer a re-routing to those flights that would optimise the effect of point (e);
(g)in coordination with the ATS units and the local ATFM units determine, coordinate and ensure the implementation of appropriate measures aimed at providing the necessary capacity to accommodate traffic demand throughout relevant portions of their area of responsibility;
(h)provide information on ATFM operations in a timely manner to aircraft operators, local ATFM units and ATS units, including:
(i)planned ATFM measures;
(ii)impact of ATFM measures on take-off time and flight profile of individual flights;
(i)monitor the occurrences of missing flight plans and multiple flight plans that are filed;
(j)suspend a flight plan when, considering the time tolerance, the ATFM departure slot cannot be met and a new estimated off-block time is not known;
(k)monitor the number of exemptions from ATFM measures granted;
(l)develop, maintain and publish contingency plans defining the actions to be taken by relevant operational stakeholders in the event of a major failure of a component of the ATFM function at network level which would result in significant reductions in capacity or major disruptions of traffic flows, or both;
(m)share with all operational stakeholders all appropriate post operational analyses and evaluations;
(n)enable the appropriate preparation and the predictability of the UK ATMS, ensure working arrangements to collect timely and updated traffic demand information for all ATFM phases from the airspace users and share this with the local ATFM units.

---
Source: https://www.legislation.gov.uk/eur/2019/123/annex/II/part/B/division/6 (the official version)
Page: https://openlegislation.uk/eu-regulation-2019-123/annex-II/part-B/division-6
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.