The NTSB says a key component appears to have failed before the Otter crash in Washington, and the agency is calling on regulators to require operators to inspect their planes before their next flights.
"DeHavilland DHC-3 Otter"
NTSB: Requiring onboard alert systems could have prevented 2019 midair collision near Ketchikan
Two pilots whose planes collided near Ketchikan in 2019 were unable to see or detect each other until a midair crash was unavoidable.