5.9.6.1 After the procedures in 5.9.1 to 5.9.5
have been completed, the test sequence shall be started. The engine
shall be operated in each mode, in any order, in accordance with the
appropriate test cycles defined in 3.2.
5.9.6.2 During each mode of the test cycle after
the initial transition period, the specified speed shall be held within
± 1% of the rated speed or ± 3 min-1 whichever
is greater except for low idle which shall be within the tolerances
declared by the manufacturer. The specified torque shall be held so
that the average over the period during which the measurements are
being taken is within ± 2% of the rated torque at the engine’s
rated speed.