I guess it is just a drag racing spec. from my SFi Spec's list.
Following is a list of all SFI Specifications applicable to FIA Championship
Drag Racing, with respective expiration periods. An item with an expiration period must be returned to the original manufacturer or his agent for inspection and recertification at the end of this period before it can be permitted for further use at an FIA sanctioned event.
1.1 Single Disc Clutch & Flywheel Assembly N/A
1.2 Multi-Disc Clutch & Flywheel Assembly;
ET, PS 2 years
1.3 Multi-Disc Clutch & Flywheel Assembly;
TMD, TMFC, TF & FC 1 year
1.4 Multi-Disc Clutch & Flywheel Assembly;
TMD & TMFC 1 year
1.5 Two-Disc Clutch & Flywheel Assembly;
ET, Adv. ET 1 year
2.2A Front engine dragster Chassis; TF, TMD 1 year
2.2B Front-engine cars, driver behind rear end
TMD N/A
2.3H Rear engine dragster Chassis; TF, TMD 1 year
2.3K Rear engine dragster Chassis; TF, TMD 1 year
2.4B Front engine dragster Chassis; Adv. ET N/A
2.5A Rear engine dragster Chassis; Adv. ET N/A
2.7A Rear engine dragster Chassis; ET N/A
3.2A/1 Jacket N/A
3.2A/5 Jacket (and Pants where applicable) N/A
3.2A/15 Jacket and Pants or Suit 5 years
3.2A/20 Drivers Suit 5 years
3.3 Neck Collar and Head Sock N/A
3.3/1 Gloves, Shoes N/A
3.3/5 Gloves, Shoes, Boots N/A
3.3/15 Gloves, Boots N/A
4.1 Automatic Transmission Shield; Rigid 5 years
4.1 Automatic Transmission Shield; Flexible 5 years
6.1 Flywheel Shield; 1.1 & 1.2 clutch
(2-disc maximum) 5 years
6.2 Flywheel Shield; 1.2, 1.3, 1.4 clutch
(more than 2-discs):
Steel 2 years
Titanium 1 year
6.3 Flywheel Shield; 1.2, 1.3, 1.4 clutch
(more than 2-discs) 2 years
(Check with manufacturer; may be only 1 year)
7.1 Lower Engine Ballistic/ Restraint Device 1 year
9.1 Flywheel Shield; 1.1 & 1.2 clutch
(2-disc maximum) 5 years
10.1C With clutch; TF, FC 1 year
10.1D Funny Car, F/E Dragster Chassis; TMFC, FC 1 year
14.1 Supercharger Restraint (Roots); ET 2 years
14.2 Supercharger Restraint (Roots); TMD,
TMFC, FC 2 years
14.21 Supercharger Restraint (Screw type); TMD,
TMFC 2 years
14.3 Supercharger Restraint (Roots);TF 2 years
14.4 Valve Cover Restraint N/A
15.1 Drive Wheels N/A
15.2 Front wheels; FC, TF N/A
15.3 Rear wheels; FC, TF N/A