France's BEA accident investigation team said that warning signs about smoke in a toilet and elsewhere started 3 minutes before plane vanished.
French probe into Alps crash caused by suicidal co-pilot advises doctors inform authorities when a patient's health is likely to affect public safety.
Officials says Air France Airbus A320 was flying at 5,500 feet as it neared Charles de Gaulle airport when co-pilot noticed drone approaching.
French crash report says Andreas Lubitz repeatedly set Spain-bound plane to drop to 100ft before slamming it into French Alps on return flight.
But official says still too early to draw any conclusions about causes of the Germanwings jet crash in the French Alps that killed 150 people.