Mowana was arrested on May 9 over allegations of sexual assault in the work place that took place some three years ago.
His brief appearances in court saw magistrate Cosmas Bidar arraign him before his case was adjourned to June 14.
From Kaibola village, Losuia, Milne Bay Province, the 53-year-old was charged with two counts of sexual assault under section 349 of the criminal code act.
Police summary facts before the court shows that the complainant, who is a married woman, claims that she was sexually touched on numerous occasions at the PNGTA office.