Just found this:
http://www.ten-tenths.com/forum/showthread.php?t=110653&page=2 taken from post 23
Crash Helmet Standards (29/03)
The Motor Sports Association (MSA) has issued regulation clarifications regarding two current crash helmet standards.
The Fédération Internationale de l'Automobile (FIA) has announced that it will cease to recognise the BS 6658-85 Type A/FR helmet standard after December 31, 2013.
However, at its most recent meeting earlier this month, the Motor Sports Council agreed to extend the life of this standard until at least December 31, 2015. This is to offer an additional two years of use for those buying the current version.
The MSA would also like to draw attention to the Snell SA2000 helmet standard. Regulation K 10.3.1 of the 2010 Competitors' and Officials' Yearbook states that this standard 'May be withdrawn with effect from 01/01/11'. However, the MSA is pleased to confirm that this standard will now be valid until December 31, 2014.