Regional airline Rex has grounded some of its planes as an investigation continues into how a propeller fell off an aircraft mid-flight as it approached Sydney Airport last week.
Regional Express has revealed the crew had shut down the right hand engine of the Saab 340 before the propeller assembly "was seen by the first officer to separate from its shaft" on Friday when the flight from Albury was 25km southwest of Sydney.
"Rex has decided, by abundance of caution, to immediately remove from service and quarantine all propeller gear boxes and shafts of the same series as that of the incident for further inspection and testing if warranted," Rex said in a statement on Monday.
The airline is yet to confirm how many planes have been impacted.
Regional Express operates a fleet of more than 50 Saab 340 aircraft on about 1500 weekly flights to 58 destinations across Australia.
The Australian Transport Safety Bureau is investigating Friday's incident, and the search continues for the propeller which is believed to have sheared off over the Camden area.