On 4 August 2017, a de Havilland DHC8-200 was climbing through 20,000 feet after departing Port Moresby when a sudden loud bang occurred and the aircraft shuddered. Apart from a caution indicating an open main landing gear door, no other impediments to normal flight were detected. After a return to the point of departure, one of the main gear tyres was found to have exploded causing substantial damage to the associated engine structure and releasing debris. The Investigation concluded that tyre failure was attributable to FOD damage during an earlier landing on an inadequately maintained but approved compacted gravel runway.