Wheelchair Accessibility on Common Property

I live in a building which has 4 steps in the foyer (common property) prior to accessing the lift. There is no  wheelchair accessibility. One of the unit owners now needs to use a wheelchair to access her unit and the stairs have become a real problem and could result in a serious accident. I have asked the EC to install access but nearly a month later am still awaiting a response. What are the responsibilities of the Executive Cttee with regards to ensuring either temporary or permanent access is installed? 

Thanks