A drone has breached restricted airspace near RAAF Base Williamtown, north of Newcastle, for the second time in a month, prompting renewed concerns about the security of one of Australia's key military aviation facilities.

The latest incident has highlighted the vulnerability of restricted airspace around the Hunter region's major defence base. RAAF Williamtown is home to Australia's F-35A Lightning II fighter aircraft and plays an important role in the country's air-combat capability.

The repeated drone breaches have raised questions about how easily unauthorised unmanned aircraft can enter controlled or restricted airspace around sensitive military facilities.

An aviation analyst told ABC that the incidents demonstrate the potential vulnerability of Australia's high-value fighter aircraft and the importance of effective counter-drone measures.

Drones can create significant safety risks around military aviation facilities because aircraft operating in the area may be travelling at high speeds and at low altitude during training or other operations. Even a relatively small unmanned aircraft can pose a collision hazard.

The Williamtown area is particularly significant because the base is located within the Hunter region and supports a major component of Australia's air-defence capability. The facility also has close links with the broader Newcastle and Port Stephens communities.

The latest breach comes only weeks after another drone incident, making the repeated incursions a growing security concern.

Authorities are continuing to monitor the situation and assess the circumstances surrounding the latest breach. The incidents also reinforce warnings that drone operators must understand and comply with Australia's aviation restrictions, particularly around airports, military bases and other protected locations.