Luxair flight LG 9562 had to return and make a gear-up landing at Saarbrücken airport, Germany, on September 30.
Authorities said the pilots of the Luxembourg-bound Bombardier Q400 aircraft decided to abort take off due to a cabin fire warning. The plane then landed on its underbelly because apparently the landing gear failed to deploy.
There were 16 passengers and 4 crew members aboard at the time; none of them was hurt.
According to an airline spokesperson, the passengers were transported to Luxembourg by road.
The FAA was investigating.