Document ID: chunk:federal_register_of_legislation:F2017L01344:body:0:p10
Version: federal_register_of_legislation:F2017L01344
Segment Type: other
Provision Reference: 
Character Range: 26686–29473

continuously for more than 3 ms. Moreover, no dangerous edge shall occur during or remain after the test.
5.2.3.2. The requirements of paragraph 5.1.3. shall not apply to rearmost seats, to back-to-back seats or to seats that comply with the provisions of Regulation No. 21 "Uniform Provisions concerning the Approval of Vehicles with regard to their Interior Fittings" (E/ECE/324‑E/ECE/TRANS/505/Rev.1/Add.20/Rev.2, as last amended).
5.2.4. The surface of the rear parts of seats shall exhibit no dangerous roughness or sharp edges likely to increase the risk of severity of injury to the occupants. This requirement is considered as satisfied if the surface of the rear parts of seats tested in the conditions specified in paragraph 6.1. below exhibit radii of curvature not less than:
 2.5 mm in area 1,
 5.0 mm in area 2,
 3.2 mm in area 3.
 These areas are defined in paragraph 6.8.1. below.
5.2.4.1. This requirement does not apply to:
5.2.4.1.1. the parts of the different areas exhibiting a projection of less than 3.2 mm from the surrounding surface, which shall exhibit blunted edges, provided that the height of the projection is not more than half its width;
5.2.4.1.2. Rearmost seats, to back-to-back seats or to seats that comply with the provisions of Regulation No. 21 "Uniform Provisions concerning the Approval of Vehicles with regard to their Interior Fittings" (E/ECE/324‑E/ECE/TRANS/505/Rev.1/ Add.20/Rev.2, as last amended);
5.2.4.1.3. Rear parts of seats situated below a horizontal plane passing through the lowest R point in each row of seats. (Where rows of seats have different heights, starting from the rear, the plane shall be turned up or down forming a vertical step passing through the R point of the row of seats immediately in front);
5.2.4.1.4. Parts such as "flexible wire mesh".
5.2.4.2. In area 2, defined in paragraph 6.8.1.2. below, surfaces may exhibit radii less than 5 mm, but not less than 2.5 mm provided that they pass the energy-dissipation test prescribed in Annex 6 to this Regulation. Moreover, these surfaces shall be padded to avoid direct contact of the head with the seat frame structure.
5.2.4.3. If the areas defined above contain parts covered with material softer than 50 Shore A hardness, the above requirements, with the exception of those relating to the energy-dissipation test in accordance with the requirements of Annex 6, shall apply only to the rigid parts.
5.2.5. No failure shall be shown in the seat frame or in the seat anchorage, the adjustment and displacement systems or their locking devices during or after the tests prescribed in paragraphs 6.2. and 6.3. below. Permanent deformations, including ruptures, may be accepted, provided that these do not increase the risk of injury in the event of a collision and