Tiger grounded over 'serious' safety concerns Updated 35 minutes ago It is the second time in a month that Tiger is being investigated for flying too low. (ABC News: Timothy Marshall) Map: Melbourne 3000 Related Story: Low-flying Tiger accused of altitude breach Related Story: Tiger Airways safety under the spotlight All Tiger Airways flights in Australia have been grounded for the next week after the Civil Aviation Safety Authority (CASA) cited serious safety concerns over the airline's operations. CASA moved to suspend Tiger's services after an incident on Thursday night when a Tiger Airways Airbus A320 flew into Avalon Airport, south-west of Melbourne, below the lowest safe altitude. It is the second time in a month that Tiger has flown below the safety standard. CASA says it is the first time it has grounded an airline. A spokesman for CASA, Peter Gibson, says concerns with the airline were raised as early as March this year when Tiger was issued with a show-cause notice over pilot training and maintenance procedures. "The Civil Aviation Safety Authority has issued Tiger with notice about a number of serious safety concerns about pilot training, about pilot standards, about maintenance standards," he said. "We've been working with the airline to deal with those issues, but we're not satisfied that they've satisfactorily done that. "Tiger has not been able to, at this stage, convince us that they can continue operations safely, so that's why they're on the ground. "We believe this is symptomatic of problems within the airline [and] we've put them on the ground while we consider all these issues." The Australian Transport Safety Bureau also says it is also looking into why the Tiger flight flew below the minimum safe altitude. On the evening of June 7, air traffic control reported another Tiger Airways A320 cleared to descend to 2,500 feet (762 metres) near Melbourne Airport, but it continued to a reported 2,000 feet. The lowest safe altitude for that leg of the approach was 2,500 feet, the bureau said. In a statement, the airline says it is cooperating fully with the safety authority. Tiger says its domestic services will remain suspended until July 9, while it conducts investigations into the two recent operational incidents. It says passengers flying domestically between now and next Saturday should not go to the airport. Customers affected will receive a full refund or credit for deferred travel. The airline says its services to and from Singapore are not affected and continue to operate normally. It says it is doing all it can to minimise passenger disruption. Passengers are being turned away from the Tiger terminal at Melbourne Airport this morning. Airport spokeswoman Anna Gillet says it is a frustrating time for those travellers who booked flights for the school holidays. "Today is a particularly busy time for us, we know it's really frustrating and we are doing what we can to assist but it is very unfortunate," she said. "We just definitely appreciate people's patience and cooperation. So I would encourage people to not come to Melbourne Airport but to speak to the Tiger Airways call centre." While not wanting to comment specifically on the grounding of Tiger Airlines, Australian and International Pilots Association president Captain Barry Jackson says it is not a surprise. "I'm concerned as we have been, as I say, for quite a while about the dropping standards in the airline industry, particularly in the low-cost sector," he said. "Because we are driving to lower and lower costs, the public expects lower and lower airfares." Mr Jackson says he is also concerned that an airline has flown below the lowest altitude considered safe. "In cloud there's a minimum set of altitudes around airports and particularly when you're approaching an airport, those minimum standards give a buffer above terrain," he said. "There's a safety margin in there but it is the absolute minimum if in cloud. If you can't see the ground you must not go below those altitudes so it's pretty serious."