4.2.1 All documentation for certification must
be completed and suitably stamped by the duly authorized Authority
as appropriate. This documentation shall also include all terms and
conditions, including replacement of spare parts, to ensure that an
engine is maintained in compliance with the applicable NOx emission
limit.
4.2.2 For an engine within an engine family or
engine group, the required documentation for the engine parameter
check method is specified in 6.2.2.