If the usual rules of Governance are enforced at CASA (which may not be the case), the CEO does not "sit" on the Board. The CEO is "in attendance" at the Board meeting and certainly has no vote. To put that slightly differently, the CEO is an invited person and can even be asked to leave if sensitive matters need discussion.
The CEO makes his report to the Board and answers questions. More than that I will not tell you since you don't know the secret handshake
