LE BOURGET, France — Seeking to ensure that suicidal pilots can’t crash their jets, French authorities investigating last year’s Germanwings crash are urging new reporting requirements for doctors treating pilots, and new measures to keep pilots from hiding mental health issues. The recommendations are delicate. The investigators from France’s BEA air accident agency acknowledged Sunday that it’s not easy to balance patients’ right to medical privacy and public safety, and said they don’t want to stigmatize people suffering depression. But they argue that aviation authorities around the world need clearer rules, after Germanwings co-pilot Andreas Lubitz locked his captain out of the cockpit and slammed Flight 9525 into an Alpine mountainside March 24, 2015.