6.3.4.1 Generally all emission measurements shall
be carried out with the engine running on marine diesel fuel oil of
an ISO 8217, 1996, DM-grade.
6.3.4.2 To avoid an unacceptable burden to the
shipowner, the measurements for confirmation tests or re-surveys may,
based on the recommendation of the engine manufacturer and the approval
of the Administration, be allowed with an engine running on heavy
fuel oil of an ISO 8217, 1996, RM-grade. In such a case the fuel-bound
nitrogen and the ignition quality of the fuel may have an influence
on the NOx emissions of the engine.