The Civil Aviation Safety Authority (CASA) will ask the Federal Court to suspend Cairns-based airline Aero-Tropics from flying for 40 days.

CASA says it needs that time to complete an investigation into two serious incidents aboard an Aero-Tropics flight this week.

It is the second time this year the airline’s planes have been grounded over safety concerns.

An Aero-Tropics spokeswoman acknowledges the suspension in a recorded message.

“The company is currently considering all its options regarding the suspension and we should be in a position to know more on Monday October 6,” it said.

“We really sincerely apologise for any inconvenience caused by this suspension. Thank you.”

Earlier, CASA spokeswoman Michelle Harris said she could not reveal what happened as the matter was under investigation, but passengers’ lives were put in danger.

“One incident occurred on take-off and one occurred in flight,” she said.

She said CASA grounded the airline in June because of safety concerns but it appealed against the decision to the Federal Court.

“Aero-Tropics were allowed to continue operating under strict conditions imposed by both the Federal Court and CASA,” she said.

“Obviously we’ve been monitoring Aero-Tropics’ adherence to those conditions, however the recent incidents give us some concern that standards aren’t improving and are in fact deteriorating.”