Nope, sorry, you're all wrong!
The ONLY 146 aircraft that are limited to FL260 or below in icing conditions, are those that DO NOT have the engine mod that prevents rollback in icing conditions. If your aircraft has three or more modded engines, the aircraft can go above FL260 in icing conditons.
Many companies choose to impose the limit in a blanket fashion, in the belief that pilots, renowned for their stupidity, might inadvertently go above FL260 in an aircraft with less than the requisite number of modded engines...
However the MANUFACTURERS limit is as stated above.
In my company, most engines are now modded. We can breathe easily again!!
Oh, by the way, this is VERY, VERY OLD news!!!!
[Edited for typo]
[This message has been edited by Raw Data (edited 16 April 2001).]