Division 2.3.1 F1

An auxiliary emission control strategy may be activated by an engine or a non-road mobile machinery, provided that the auxiliary emission control strategy:

1. 2.3.1.1.

   does not permanently reduce the effectiveness of the emission control system;

2. 2.3.1.2.

   operates only outside the control conditions specified in points 2.4.1, 2.4.2 or 2.4.3 for the purposes defined in point 2.3.5 and only as long as is needed for those purposes, except as permitted by points 2.3.1.3, 2.3.2 and 2.3.4;

3. 2.3.1.3.

   is activated only exceptionally within the control conditions in points 2.4.1, 2.4.2 or 2.4.3, respectively, has been demonstrated to be necessary for the purposes identified in point 2.3.5 has been approved by the approval authority, and is not activated for longer than is needed for those purposes;

4. 2.3.1.4.

   ensures a level of performance of the emission control system that is as close as possible to that provided by the base emission control strategy.