At the request of the City of Toronto, PortsToronto proposed to construct a Ground Run-Up Enclosure (GRE) at Billy Bishop Toronto City Airport. A GRE is an open-air, acoustically engineered structure used to dampen the noise produced by engine maintenance run-up inspections. The GRE officially opened in April 2017. The City of Toronto undertook a technical review of the GRE. This page contains resources from the technical review.