The mother of Micheál Ryan who died in the Ethiopian airlines crash in March has said she believes "heads should roll" at airline company Boeing.

Speaking to RTÉ News, Christine Ryan said "I do believe heads should roll at Boeing and the CEO has ultimate responsibility, but he's not the only one".

She said Boeing should be held accountable for the crash of Ethiopian airlines flight 302 which crashed on 10 March killing all 157 people on board.

Mr Ryan was the father of two young children, and had just moved to Rome with his family where he was starting a new role.

Ms Ryan spoke to RTÉ News as the first representative of victim's families was due to give evidence before Congress in Washington DC.

Paul Njoroge was due to give evidence today along with Dana Schulze, acting director of the the National Transportation Safety Board's Office of Aviation Safety and officials from aviation workers unions.

Boeing Co said today at least half of its $100 million fund for victims and communities affected by two deadly 737 MAX crashes would go directly to the families of those killed.

'He wanted to save the world,' says plane crash victim Micheál Ryan's mother

Earlier this month, Boeing said it would give $100m over multiple years to local governments and non-profit organisations to help families and communities affected by the crashes.

However, Ms Ryan told RTÉ News "I don't think a financial settlement like that is going to bring back any of the victims - we want heads to roll".

She said her family had not received any invitation to give evidence at Congress, but that she would welcome the chance to do so.

"The loss of all those lives on the second plane could have been avoided. As far as we're concerned it was corporate greed," she added.

She also feels the Federal Aviation Administration are culpable as they rubber stamped the certification that existed for the fleet, instead of issuing new certification for the aircraft which had sensor problems, which lead to two aircrafts crashing.

She said they have found it very difficult to come to terms with what happened to Micheál, as they have no body to grieve for.

Ms Ryan has been to Ethiopia which she said was very difficult. The family may still get DNA, but that is not the same as being able to have Micheál's remains returned to them, and because of this they have not been able to have a memorial service up to now.

They plan to have a memorial service celebrating his life on 31 August, at which there will be a mass at Lahinch church and a paddle out by surfers in his memory as he was a keen surfer and golfer growing up in Lahinch.

Additional reporting Cathy Halloran