Safety recommendation
Edison Electric Institute Notified of 1989 Airville Accident
The institute was informed of the incident involving transmission lines crossing waterways.
The Edison Electric Institute was informed of the circumstances of an accident that occurred in Airville, Pennsylvania, on April 12, 1989. The incident involved transmission lines crossing rivers, lakes, canyons, or gorges, and the institute was encouraged to mount spherical markers that conform with the Federal Aviation Administration Advisory Circular 70/7460 1G.
Original regulatory source: https://data.ntsb.gov/carol-main-public/sr-details/A-89-100