Matt Wright, Neil Mellon and Michael Burbidge are all set to face Darwin Local Court on Thursday at 10am local time.
The trio have been charged in relation to the investigation of the helicopter crash that killed Chris ‘Willow’ Wilson.
Wright is accused of attempting to pervert the course of justice, destroying evidence, fabricating evidence, unlawfully entering a building, unlawfully entering a dwelling, making a false declaration and interfering with witnesses in a criminal investigation or court process by making threats/reprisals.
Mellon has been charged with 32 offences including attempting to pervert the course of justice, stealing and unlawfully accessing data.
His charges also relate to weapons, firearms and wildlife offences, as well as alleged destruction of evidence in relation to a major crash investigation.
Burbidge was charged with destroying evidence, conspiracy and attempting to pervert the course of justice, and providing a false statement.
The trio will appear in court on Thursday for a preliminary examination application which is expected to continue into Friday.
The hearing will determine whether or not the case will go onto the NT Supreme Court.