Document ID: chunk:federal_register_of_legislation:F2017C00972:body:0:p13
Version: federal_register_of_legislation:F2017C00972
Segment Type: other
Provision Reference: 
Character Range: 34815–37375

front seats and 750 mm in the case of other seats.

5.5.3. For head restraints adjustable for height:

        5.5.3.1. 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;

        5.5.3.2. there shall be no "use position" resulting in a height of less than 750 mm;

        5.5.3.3. 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;

5.5.3.4. 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.

        5.5.4. The dimensions mentioned in paragraphs 5.5.2. and 5.5.3.1. 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 5.5.3.2. above, there shall not be any "use position" resulting in a height lower than 700 mm.

        5.5.5. By derogation to the height requirements mentioned in paragraphs 5.5.2. and 5.5.3.1. above, the height of any head restraint designed to be provided in rear centre seats or seating positions shall be not less than 700 mm.

        5.6. In the case of a seat capable of being fitted with a head restraint, the provisions of paragraphs 5.1.3. and 5.4.2. above shall be verified.

        5.6.1. The height of the part of the device on which the head rests, measured as described in paragraph 6.5. below, shall in the case of a head restraint adjustable for height be not less than 100 mm.

        5.7. There shall be no gap of more than 60 mm between the seat‑back and the head restraint in the case of a device not adjustable for height.  If the head restraint is adjustable for height it shall, in its lowest position, be not more than 25 mm from the top of the seat‑back.  In the case of seats or bench