# Commission Implementing Regulation (EU) 2019/2153 of 16 December 2019 on the fees and charges levied by the European Union Aviation Safety Agency, and repealing Regulation (EU) No 319/2014, Division 2: For the purpose of the formula referred to in paragraph 1, the following shall apply:

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

d = travel expenses due;
v = transport costs;
a = official Commission standard rates for ‘per diems’ covering accommodation, meals, local travel within the place of mission and sundry expenses;
h = travel time (standard number of travel hours per destination, established by the Agency), at the hourly rate set out in Part II of the Annex; in case of missions relating to several projects, the amount shall be subdivided accordingly.

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Source: https://www.legislation.gov.uk/eur/2019/2153/annex/part/IIa/division/C/division/2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2019-2153/annex/part-IIa/division-C/division-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.