TurnoverBased on the Regulation as of September 7, 2012
Turnover is defined as:
Retiring a vehicle
Designating a vehicle as a permanent low-use vehicle (must be used less than 200 hours per year from the date designated).
Repowering a vehicle with a higher tier engine, or rebuilding the engine to a more stringent emissions configuration. The new engine or rebuild engine must be Tier 2 or higher tier. Note that large and medium fleets cannot add Tier 2 engines/equipment to their fleets beginning Jan 1, 2018 and for small fleets beginning Jan 1, 2023.
Note that replacing a lower tier piece of equipment with high tier piece of equipment is technically not considered Turnover. The elimination of the lower tier equipment is considered retirement so credit is given for that action. The addition of the new(er) equipment is governed by another provision "Adding Vehicles."
The "Adding Vehicles" provision says a fleet can add a piece of equipment as follows:
Tier 0 powered equipment: cannot be added.
Tier 1 powered equipment added by medium and large fleets: Can be added until Jan 1, 2013 provided the equipment has an EIN as of Jan 1, 2012.
Tier 1 powered equipment added by small fleets: Can be added until Jan 1, 2016.
Tier 2 powered equipment added by medium and large fleets: Can be added until Jan 1, 2018.
Tier 2 powered equipment added by small fleets: Can be added until Jan 1, 2023.
There are a number of exemptions from Turnover. For details click on the "Turnover Exemptions" box in the compliance chart.