CHAPTER 7 COMPETITOR VEHICLES AND VEHICLE SAFETY EQUIPMENT Appendix 7- Seats Harnesses and Headrests
General
1. Seating 1.1. Have a normal adequate seat for the Driver( and Co-Driver where applicable).
1.2. With the occupant seated, the seat must be correctly located and securely anchored within the compartment and must not tilt, hinge or fold unless it is a production seat fitted with a serviceable locking mechanism preventing independent operation.
1.3. It must support and retain the Driver within the Vehicle.
1.4. The seat cushion( i. e. the part on which the occupant sits) when uncompressed, must not be less than 152.5mm below the top edge of the adjacent body side or door.
1.5. Any other seats fitted must similarly comply and all seats must face forward. 1.6. Vehicles of Periods A to D are exempt from this requirement. 1.7. If a single seater the maximum time for a Driver to get in or out of the Vehicle must not exceed 10 seconds.
2. Seats
2.1. All seats should be correctly located and securely anchored in such a way as to allow no movement in squab or backrest. When installing a Competition Seat, carry out the following checks before selection or purchase:
a.
b.
Study the requirements of the Vehicle concerned and ask the manufacturer’ s advice and recommendations.
Check that the seat is suitable for the type of forces to which it could be subjected. These will include fore and aft and lateral loadings.
c. Check that the seat carries full instructions for installation in your Vehicle. d. Check that suitable mounting installations are available from the manufacturer. e. Ask the manufacturer to confirm that the seat frame is suitable for your Motor Sport discipline. f.
If the original seat attachments or supports are changed, the new parts must either be approved for that application by the seat manufacturer or must comply with the following specifications( see Appendix 13 Diagram 48).
2.2. Supports must be attached to the shell / Chassis via at least 4 mounting points per seat using bolts with a minimum diameter of 8mm and counterplates, according to Appendix 13 Diagram 48.
2.3. The minimum area of contact between support, shell / Chassis and counterplate is 40 sq cm for each mounting point.
2.4. In Series Production Cars manufacturers’ standard seat mounting points may be used.
2.5. If quick release systems are used they must be capable of withstanding vertical and horizontal forces of 18000N, applied non-simultaneously.
2.6. If rails for adjusting the seat are used, they must be those originally supplied with the homologated Vehicle or with the seat.
2.7. For new build Vehicles from 1st January 2021, where transverse seat mounting rails are used, they must be compliant with Appendix 13 Diagram 66. a or homologated by the FIA or an FIA recognised ASN.
2.8. The end plates may alternatively be welded to the counterplate. 2.9. Multiple mounting holes, to a maximum of 4 at each mounting point, are permitted as shown in Appendix
Motorsport UK 2025 National Competition Rules Version 11
Chapter 7 Appendix 7- Seats Harnesses and Headrests 269