The de Havilland Heron was on a ferry flight from Bahrain to England for inspections and modifications. The flight left Athens at 14:07 GMT for an IFR flight plan flight to Rome. En route the crew requested a lower flight level, but this was not granted because the requested level was below safety minimums. The aircraft did not arrive at Rome and was found to have crashed against the southeast slope of Mount Scifarello at a height of about 5675 feet (1730 m). PROBABLE CAUSE: “The accident was caused by a navigational error. The following were contributing causes: a) weather conditions encountered were worse than forecast; b) the pilot had difficulty in receiving MF bearings; c) there was no anti-icing equipment on the wing surfaces.”