If the interpretation being proposed were to be finalized, EPA’s authority to address heavy-duty engine rebuilding practices would not be affected. Under this proposed interpretation: (1) Glider vehicles would not be treated as “new motor vehicles,” (2) glider engines would not be treated as “new motor vehicle engines,” and (3) glider kits would not be treated as “incomplete” new motor vehicles.ĮPA is proposing to repeal those provisions of the Phase 2 rule applicable to glider vehicles, glider engines and glider kits. Phase Two rules specified by January 2021, the 2018 small-business exemption would end and all glider vehicles would need to meet the Phase Two GHG vehicle standards.īased on petitions for reconsideration of the Phase Two final rule, new data and revised interpretations of the Clean Air Act, EPA proposed it does not have the statutory authority to regulate glider kits. The exemption would have allowed certain businesses to produce up to 300 glider vehicles or their highest annual production volume for calendar years 2010–2014, whichever is less, with older engines. Under the previous rules, in 2018, engines in glider vehicles would have to meet emissions standards corresponding to the year of the glider vehicle (however, there would be a limited small-business exemption). Any production beyond that limit would need to use engines certified as legal for the same year as the glider kit is built. In 2017, glider vehicle builders’ production was to be capped at the manufacturer’s highest annual production of glider kits and glider vehicles for any year from 2010–2014. The Phase Two final rule (now subject to possible revocation) would have phased-out the use of older engines in glider kits by 2021. In the Phase Two rule, EPA estimated by 2025, glider vehicles would compose about 5 percent of heavy-duty tractors on the road, but would be responsible for approximately one-third of all NOx and PM emissions from heavy-duty tractors. These vehicles typically match an older pre-emissions engine with a new glider kit.
Glider kit sales surged to more than 20,000 in 2015. Traditionally, a few hundred such vehicles were produced per year, usually to reuse an engine and drivetrain from an otherwise damaged tractor. A used/rebuilt engine and drivetrain components are added to complete the vehicle. In the notice, EPA said that its original interpretation of the Clean Air Act has changed and, as such, new glider kit regulations should be revoked.Ī glider kit is a tractor chassis with frame, front axle, interior and exterior cab, and brakes. This article was published in the January 2018 edition of NTEA News.Įnvironmental Protection Agency (EPA) published a Federal Register notice (82 FR 53442) proposing to reverse its Phase Two greenhouse gas rule decision on glider kits.
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