A380 engine maker Rolls-Royce has finally spoken out months after its engine failed on a Qantas flight in November of last year.

Chief executive Andrew Dudgeon of Rolls-Royce Australia Services said at the Avalon air show that reports that company officials were already aware of problems with its engines on the A380 prior to its release were false. He called them a ‘fallacy’. However when questioned of details regarding two changes to the European Aviation Safety Agency certified engine’s design, Dedgeon replied that he was unaware of the specifics.

The news comes after the November 4 incident in which a Qantas A380 with 469 people onboard saw an engine fail and catch fire shortly after taking off from Singapore’s Changi Airport, where it was forced to immediately return. Following the ordeal Qantas and Rolls Royce have conducted conversations regarding compensation.

Meanwhile, new issues similar to those already seen have surfaced on Qantas A380 jets in the last few weeks. The Australian Transport Safety Bureau is currently conducting a probe into one situation in which a one of the jets partially lost power during a flight on the 24th of February. That inquiry came after a similar event just weeks earlier when Qantas flight QF32 partially lost power, which officials say was caused by an oil leak.