6.2.1.1 Engines that meet the following conditions
shall be eligible for an engine parameter check method:
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.1 engines that have received a pre-certificate
(EIAPP Certificate) on the test-bed and those that received a certificate
(IAPP Certificate) following an initial certification survey; and
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.2 engines that have undergone modifications or
adjustments to the designated engine components and adjustable features
since they were last surveyed.
6.2.1.2 An engine parameter check method shall
be conducted on engines, subject to 6.2.1.1, whenever there is a change
of components and/or adjustable features of the engine that affect
NOx emission levels. This method shall be used to confirm
compliance with the NOx emission limits. Engines installed
in ships shall be designed in advance for an easy check of components,
adjustable features and engine parameters that affect NOx emission
levels.
6.2.1.3 In addition, when a diesel engine is designed
to run within the prescribed NOx emission limits, it is
most likely that, within the marine life of the engine, the NOx emission
limits may be adhered to. The prescribed NOx emission limits
may, however, be contravened by adjustments or modification to the
engine. Therefore, an engine parameter check method shall be used
to verify whether the engine is still within the prescribed NOx emission
limits.
6.2.1.4 Engine component checks, including checks
of settings and an engine's operating values, are intended to provide
an easy means of deducing the emissions performance of the engine
for the purpose of verification that an engine with no, or minor,
adjustments or modifications complies with the applicable NOx emission
limits.
6.2.1.5 The purpose of such checks is to provide
a ready means of determining that an engine is correctly adjusted
in accordance with the manufacturer's specification and remains in
a condition of adjustment consistent with the initial certification
by the Administration as compliant with regulation
13 of Annex VI.
6.2.1.6 If an electronic-engine management system
is employed, this shall be evaluated against the original settings
to ensure that appropriate parameters are operating within "as-built"
limits.
6.2.1.7 For the purpose of assessing compliance
with regulation 13 of Annex
VI, it is not always necessary to measure the NOx level
to know that an engine, not equipped with an after-treatment device,
is likely to comply with the NOx emission limits. It may
be sufficient to know that the present state of the engine corresponds
to the specified components, calibration or parameter-adjustment state
at the time of initial certification. If the results of an engine
parameter check method indicate the likelihood that the engine complies
with the NOx emission limits, the engine may be re-certified
without direct NOx measurement.
6.2.1.8 For engines equipped with after-treatment
devices, it will be necessary to check the operation of the after-treatment
device as part of the parameter check.