A search is continuing for a pilot and his partner after a bright-green light aircraft vanished over the Bass Strait on Saturday afternoon.

The light plane was carrying the pilot, a man in his 70s, and a female passenger, in her 60s, as it headed for Hillston airport, Condolobin, NSW, via Leongatha, Victoria.

The pair are both Tasmanian residents and had been travelling in the two-seat aircraft to visit friends.

The Australian Maritime Safety Authority (AMSA) said it was coordinating a search for the couple near Tasmania.

'Just after 5pm on Saturday evening, concern was raised after the aircraft failed to land in Central Western NSW, after departing George Town, Tasmania at around 12.45pm,' a spokesman said.