Two brothers killed in NSW kit plane crash

Steve Zemek and Julian Drape

Two brothers killed in a plane crash on the NSW-Queensland border have been remembered as passionate aviators as their family sought to allay safety concerns about their home-built craft.

Robert Bryan Dull, 68, and Owen Stanley Dull, 61, died when their small kit aircraft crashed into the Koreelah National Park on Sunday.

Rescuers entered the national park on Monday after the Wittman Tailwind's wreckage was spotted in rugged terrain by the Westpac Rescue Helicopter following a coordinated search.

The single-engine, two-seat light aircraft left Casino Airport in NSW on Sunday afternoon but never reached its scheduled destination of Boonah in southeast Queensland.

In a statement, the brothers' family said they were both pilots with several decades of experience.

They also said the Wittman Tailwind - which is constructed with a steel tubing fuselage, wooden wings and fabric covering - had passed all safety requirements.

"Robert had built the plane as a labour of love over the past few years," the family said.

"It was awarded the John Liddell Award for Best Hybrid Experimental Amateur Built Aircraft 2019 by the Sport Aircraft Association in October 2019 and it had met all regulatory requirements."

Both men had flown light aircraft for more than 30 years, the family said.

"Robert is survived by his wife, three adult sons, their spouses and four grandchildren. Owen is survived by his wife.

"We would like to thank all of those involved in the search and recovery efforts for Robert and Owen in difficult conditions."

Home builders need to have their kit planes checked by an engineer and complete test flights away from populated areas before they can be flown regularly, Civil Aviation Safety Authority spokesman Peter Gibson told AAP.

"It's a basic plane ... but it is regulated," Mr Gibson said on Monday.

NSW police rescue and SES volunteers went to the area on foot, with officers arriving at the crash site about 3pm and confirming the two men had died.

The Australian Transport and Safety Bureau will now investigate the incident.

Investigators will be sent to the site to examine the wreckage and the surrounding site.

The ATSB will also analyse recorded data, review weather information and interview any witnesses for a report to be released when the investigation concludes.