# Commission Regulation (EC) No 631/2009 of 22 July 2009 laying down detailed rules for the implementation of Annex I to Regulation (EC) No 78/2009 of the European Parliament and of the Council on the type-approval of motor vehicles with regard to the protection of pedestrians and other vulnerable road users, amending Directive 2007/46/EC and repealing Directives 2003/102/EC and 2005/66/EC, Division 4.6

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

The bottom of the impactor shall be 25 mm above the ground reference level at the time of first contact with the bumper (see Figure 2), with a ±10 mm tolerance.
In case the vehicle is tested in accordance with Section 2.1(a) of Annex I to Regulation (EC) No 78/2009, the bottom of the impactor may also be at the ground reference level at the time of first contact with the bumper, with a ± 10 mm tolerance.
When setting the height of the propulsion system, an allowance shall be made for the influence of gravity during the period of free flight of the impactor.
At the time of first contact the impactor shall have the intended orientation about its vertical axis, for the correct operation of its knee joint, with a tolerance of ± 5° (see Figure 1).

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Source: https://www.legislation.gov.uk/eur/2009/631/annex/part/II/chapter/II/division/4/division/4.6 (the official version)
Page: https://openlegislation.uk/eu-regulation-2009-631/annex/part-II/chapter-II/division-4/division-4.6
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.