

                 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
                NATIONAL VEHICLE AND FUEL EMISSIONS LABORATORY
                             2000 TRAVERWOOD DRIVE
                           ANN ARBOR, MI  48105-2498


									     OFFICE OF
									AIR AND RADIATION

August 5, 2016

MEMORANDUM

SUBJECT: 	Meetings with Truck and Engine Manufacturers Association (EMA) Members Regarding Aerodynamics Issues in the Proposed Heavy-Duty Phase 2 Greenhouse Gas Rulemaking

FROM: 	Prashanth Gururaja, Assessment and Standards Division, Office of Transportation and Air Quality

TO: 	Greenhouse Gas Emissions Standards and Fuel Efficiency Standards for Medium- and Heavy-Duty Engines and Vehicles - Phase 2 - Docket EPA-HQ-OAR-2014-0827

This memo summarizes meetings between EPA and the Truck and Engine Manufacturers Association (EMA) regarding aerodynamics issues in the proposed Heavy-Duty Phase 2 Greenhouse Gas Emissions Rulemaking. Meetings occurred in-person or over teleconference on the following dates:

July 23, 2015
August 25-26, 2015
October 30, 2015
February 24, 2016
March 15, 2016
March 31, 2016
April 15, 2016
May 27, 2016
June 10, 2016
August 1, 2016

Attached are agendas and supporting materials, where available. Major topics include coastdown test procedures, coastdown analysis methods, variability of coastdown testing, use of surrogate yaw angle for wind-averaged drag determination, alternate aerodynamic methods, certification processes, selective enforcement audits, and constant speed testing.

