Updated: 3:22 PM EDT May 18, 2021 YORK COUNTY, Pa. — Metropolitan Edison, a subsidiary of FirstEnergy Corp., said Tuesday it is using a helicopter equipped with an aerial saw to trim trees and maintain electrical clearances along four difficult-to-access transmission line corridors crossing York and Adams Counties. The work is expected to conclude by the end of the month, according to Met-Ed. Maintaining proper clearances around transmission lines and electrical equipment can help reduce the frequency and duration of tree-related power outages, especially those associated with severe weather such as spring and summer thunderstorms, the company said. The helicopter trimming trees along the transmission lines is a white Hughes MD500 with blue and yellow stripes prominently marked with a registration number of N53846 in blue paint.