Document ID: chunk:federal_register_of_legislation:F2017L01344:body:0:p13
Version: federal_register_of_legislation:F2017L01344
Segment Type: other
Provision Reference: 
Character Range: 34055–36599

fitted to seats behind which no seat is provided.
5.5.4. The head restraints shall be secured to the seat or to the vehicle structure in such a way that no rigid and dangerous parts project from the padding of the head restraint or from its attachments to the seat-back as a result of the pressure exerted by the headform during the test.
5.5.5. In the case of a seat fitted with head restraints, the provisions of paragraph 5.2.3. may, after agreement of the Technical Service, be considered to be met if the seat fitted with its head restraint complies with the provisions of paragraph 5.5.2. above.
5.6. Height of head restraints
5.6.1. The height of head restraints shall be measured as described in paragraph 6.5. below.
5.6.2. For head restraints not adjustable for height, the height shall be not less than 800 mm in the case of front seats and 750 mm in the case of other seats.
5.6.3. For head restraints adjustable for height:
5.6.3.1. The height shall be not less than 800 mm in the case of front seats and 750 mm in the case of other seats; this value shall be obtained in a position between the highest and lowest positions to which adjustment is possible;
5.6.3.2. There shall be no "use position" resulting in a height of less than 750 mm;
5.6.3.3. In the case of seats other than the front seats the head restraints may be such that they can be displaced to a position resulting in a height of less than 750 mm, provided that such position is clearly recognizable to the occupant as not being included for the use of the head restraint;
5.6.3.4. In the case of front seats head restraints may be such that they can be automatically displaced when the seat is not occupied, to a position resulting in a height of less than 750 mm, provided that they automatically return to the position of use when the seat is occupied.
5.6.4. The dimensions mentioned in paragraphs 5.6.2. and 5.6.3.1. above may be less than 800 mm in the case of front seats and 750 mm in the case of other seats to leave adequate clearance between the head restraint and the interior surface of the roof, the windows or any part of the vehicle structure; however, the clearance shall not exceed 25 mm. In the case of seats fitted with displacement and/or adjustment systems, this shall apply to all seat positions. Furthermore, by derogation to paragraph 5.6.3.2. above, there shall not be any "use position" resulting in a height lower than 700 mm.
5.6.5. By derogation to the height requirements mentioned in paragraphs 5.6.2. and 5.6.3.1. above, the height