Clause 8 makes provision for technical regulations to be called Stable Regulations.
Clause 8.3
The FIA may...make changes relating to the engine, the transmission
and all associated components and devices, or anything influencing the
performances of any of these (such as the total fuel storage capacity
of the cars or the race distance provisions) and the minimum weight of
the cars, provided that such changes do not come into force before the
1st of January, or if later, the entry closing date following the date
of their official publication...provided that the unanimous agreement
is obtained of such of those competitors who at the time the changes
in question are proposed are signatories to (the Concorde), and are
currently competing and have been in the top 10 competitors in two out
of the previous three FIA F1 Championship seasons.
[11]
Clause 8.10
The FIA needs to announce the technical regulations for the 2008 world championship no later than 31 December 2005.
[10]
Clause 8.11
... contains an express acceptance by the parties of the FIA Regulations which may only be altered by unanimous
agreement and with effect from 1st January in any year.
[15]
Along similar lines is this article about rule changing timelines: (written Jan 2003):
But the FIA is constrained by the Concorde Agreement. It cannot change any rule for 2003 without the unanimous
agreement of the teams. For 2004 it can change sporting rules at any time before 31 October 2003 (subject to an 18:8
majority in the Formula One Commission), but cannot change technical rules without unanimous agreement.
For 2005 it can again change sporting rules, this time until 31 October 2004. But technical (although not engine or
drive train) regulations can be changed only for 2005 (with the same 18:8 majority plus an 80% majority in the Technical
Working Group) and then only if this is done before 1 January 2004.
[12]