5.2.3.1 The basis for the measurement of specific
emissions is uncorrected brake power.
5.2.3.2 Auxiliaries not necessary for the operation
of the engine and which may be mounted on the engine may be removed
for the test. See also 5.1.5 and 5.1.6.
5.2.3.3 Where non-essential auxiliaries have not
been removed, the power absorbed by them at the test speeds shall
be determined in order to calculate the uncorrected brake power in
accordance with formula (18). See also 5.12.5.1.