The Royal Australian Air Force’s (RAAF) aging fleet of F-111 strike aircraft was grounded after an emergency was declared during a display at the Singapore International Air Show.

On 11 February, an F-111’s dump and burn display was cancelled after an in-flight incident was detected, according to The Australian.

The F-111’s on-board instruments indicated an engine fire during the flying display.

A defence spokesman said the pilot terminated the display, declared a mayday, completed his safety checklist and landed without incident at Changi Air Base East.

The F-111, which has been in service with the RAAF since 1973, will retire in December 2010 and will be replaced by the F/A-18F Super Hornet.

Developed by General Dynamics, the F-111 is a medium-range interdictor and tactical strike aircraft, which also plays the role of strategic bomber, reconnaissance and electronic warfare.