På fabrikantens anmodning skal de dele af ryglænets bagside, der er beliggende i det i dette regulativs punkt 2.21 angivne referenceområde, afprøves efter forskrifterne for energioptagelse i bilag 4 til regulativ nr. 21.
Elements of the rear part of seat backs situated in the reference zone, as defined in paragraph 2.21 of this Regulation, shall be verified at the request of the manufacturer according to the energy absorbing requirements set out in Annex 4, to Regulation No 21.