fly), the repair or modification must be examined by an aeronautical engineer so that the many complex factors that affect aircraft flight, structures and systems can be assessed and the design change approved as airworthy. To do this the engineer assesses the design of the modification or repair against the airworthiness requirements for the aircraft and then must justify that the design meets these requirements through the use of analysis, testing and experience. If the design has been shown to meet the airworthiness requirements it may be approved under Civil Aviation Regulation 35 (CAR35) and is hence 'approved data', satisfying CAR42U. Provisions similar to CAR42U exist for how to and what to use when performing maintenance on an aircraft under CAR42V. If maintenance personnel wish to deviate from the aircraft's approved maintenance data, the materials and procedures need to be approved under CAR36A. AEA, along with other similar approved persons around Australia, is an approved design authority under CAR35 and CAR36 (for the approval of replacement components). AEA is also approved under the Papua New Guinea Civil Aviation Rules Part 146 which mirrors CAR35 for PNG registered (P2 registered) aircraft. References External links Aeronautical Engineers Australia website Airline Technical Services website Explorer Aircraft website Technology companies of Australia Engineering consulting firms of Australia Technology companies established in 1978 Consulting firms established in 1978