1.   Air safety experts have speculated that propeller problems or ice on the aircraft could have caused the crash.

2.   The propeller unit problems were supposedly corrected after the accident, said Michael Overly, head of the non-profit Aviation Safety Institute in Worthington Ohio.

3.   The Aurora Australis suffered an engine room fire shortly after leaving Fremantle, where it had a propeller problem repaired, in mid-January.

4.   Alleged repeated propeller problems, which AMI has blamed on the manufacturer and which caused groundings several times in the last two months, need not have happened.

5.   Press reports said the aircraft had a history of de-icing equipment and propeller problems.

6.   Propeller problems have been at the heart of many but not all of the crashes involving the Brazilian-manufactured aircraft.