Division 3.4.2.4
United Kingdom
The bottom of the impactor shall be at ground reference level at the time of first contact with the bumper (see Figure 2), with a ± 10 mm tolerance.
When setting the height of the propulsion system, an allowance must 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 3).