The California Air Resources Board plans to hold a public hearing on amendments to its emission regulations for transport refrigeration units Nov. 18.

The board plans to consider amendments to the Airborne Toxic Control Measure for In-Use Diesel-Fueled TRUs, including a proposition to change the in-use performance standards for model year 2003 and some 2004 TRU engines to be less stringent.

A 45-day open comment period precedes the hearing.

If approved, the amendment would allow for all model year 2003 and only model year 2004 engines in the less than 25 horsepower category to comply with the low-emission TRU in-use standard, instead of the ultra-low-emission standard. They would need to meet the more stringent ultra-low-emission standard by 2017 or 2018.

“But, the advantage is if they comply now, they don’t have to go back in 2017 (or 2018) and do anything,” said Rob Hill, staff air pollution specialist.

The amendments also affect California’s equipment manufacturer flexibility program to provide seven years of operational life to flexibility engines installed before the effective date of the amendments, according to a notice from the board, and would also impose new reporting requirements for those manufacturers. Hill said these amendments would provide benefits for the manufacturers.

Details are available at

Hill said the board expects to tackle some more complicated issues related to the rule later in 2011.

The hearing it set to begin at 9 a.m. on Nov. 18 at Byron Sher Auditorium, 1001 I St., Sacramento, but the TRU issue may not be discussed until the following day. The board should publish an agenda by Nov. 8 that will detail when the issue will be discussed.