CASA has confirmed that Executive Manager, Industry Permission, Peter Fereday, will leave the regulator today.
According to the announcement, CASA has made no permanent replacement for Fereday pending wider changes.
Fereday's departure comes less than a week after former Deputy Director Terry Farquharson was scheduled to also leave CASA.
Fereday becomes the third senior manager to leave CASA since the tenure of John McCormick ended, behind Farquharson and Principle Medical Officer Pooshan Navathe.
CASA has given no reason why Fereday is leaving.