Built in 1969 and on lease to a Canadian survey company. Expired as N25EC prior to 2020. The building behind dates from 1937 when TCA used it as an engine and propeller overhaul shop for radial engines and for the R-R Merlins used on the North Star. At this date it was still in use for Dowty-Rotol propellers on the Viscount and R-R Dart engine repairs. Full overhauls were done at the Rolls-Royce plant at Montréal.