Low-cost carrier Tiger Airways has been issued a show-cause notice by Australia's Civil Aviation Safety Authority (CASA) following concerns over safety at the airline.
The airline, which declines to elaborate on the notice, says: "Last month, CASA asked Tiger to clarify certain matters, which Tiger has responded to in full."
Reports say the CASA notice seeked answers from Tiger regarding pilot training and maintenance standards.
Tiger says it continues to operate normal services, adding: "Safety underpins Tiger's operations at all times."
CASA says that airlines that have been served with a show cause notice may continue to operate while pending the outcome of the show cause notice process.
The agency, which did not name Tiger, adds that it "does not normally comment publicly on the regulatory actions it takes until those matters have been finally determined".
"If CASA believed the operations of any airline posed a serious and imminent risk to air safety, it would act to suspend that airline's operations immediately," it adds.