Malaysia ##yers claims the expired battery in the beacon is insignificant . Lawyers say it could be key in any legal action against the airline . Plane from Kuala Lumpur to Beijing vanished with eight people on board . Wide search since incident on March 31 , 2014 has so far proved fruitless . Report looks at complete normality of navigation which achieved huge successes .
Malaysia Airlines say the expired battery in the beacon is insignificant . Lawyers say it could be key in any legal action against the airline . Plane from Kuala Lumpur to Beijing vanished with 239 people on board . Wide search since incident on March 8 , 2014 has so far proved fruitless . Report looks at complete normality of flight which became huge mystery .