The Civil Aviation Safety Authority (CASA) has confirmed it has found no issues with the safety of Regional Express aircraft.
A report by the Australian Licenced Aircraft Engineers' Assocation (ALAEA) was lodged with CASA in late May that prompted investigations into the claims by a former employee about poor safety culture within the airline.
CASA confirmed on July 6 that after a month of intensive investigation into Rex maintenance and a two-day audit of the Rex maintenance facility in Wagga Wagga on July 4 and 5, it had no concerns about the airworthiness of Rex's aircraft.
The audit focused on Rex's safety management system, particularly error reporting rates and processes for managing them.
CASA spokesperson Peter Gibson said management and staff were cooperative and responsive to the audit's requests and questions, and engineering staff with Rex were randomly selected by CASA and interviewed.
He said all the engineers felt confident in reporting maintenance errors or defects to Rex.
While it usually takes 21 days to finalise an audit report, CASA will fast-track the completion of the report.
A Rex spokesperson said the airline was grateful the investigation had been conducted promptly and responsibly.
"CASA conducted their investigations in a prompt, comprehensive and responsible manner that should leave no doubt with regard to the safety of Rex flights in the minds of regional passengers, many of whom depend exclusively on Rex for their medical, educational and professional travelling needs," the company said.