At the inquest, Mr Leyton outline his safety concerns following the plane crash.
The people on board the plane were made up of 59 passengers, two flight crew and five cabin attendants. There were no survivors.
The coroner said he "wanted answers" regarding cockpit fires, smoke procedures and the effectiveness of fire extinguishers.
The coroner called for a review of the regulations to "prevent the use of cigarettes in the cockpit and related flammable items".
He recorded a narrative conclusion and has issued a Prevention of Future Deaths Report.
The report has been sent to the European Aviation Safety Agency and the Department for Transport.
Mr Osman was working and living in Jersey, with his wife Aurelie Vandeputte and their two young daughters, at the time of his death.
At the inquest Ms Vandeputte described her husband as a "charismatic yet humble young man".
Ms Vandeputte said he loved rugby and was "proud of his Welsh-Egyptian background".
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