C.J. Roberts & Associates, Inc.
B.Sc. Physics 1975
B.A.Sc. Mechanical Engineering 1979
Registered Professional Engineer
John is an aerospace specialist with over 25 years as Transport Canada Aircraft Certification Delegate (three years as a Designated Engineer (DE) and the balance as a Design Approval Representative (DAR) in the speciality of structures. His DAR delegation includes: Normal and commuter category airplanes (FAA Part 23);Transport category airplanes (FAA Part 25); Normal category rotorcraft (FAA Part 27); and Transport category rotorcraft (FAA Part 29). In addition to aerospace regulations, John is experienced with a range of other regulations, codes and standards.
Aerospace engineering consulting services are provided through the consulting firm CJ Roberts & Associates.
John is also a Delegated Engineer (DE) within the Air Spray (1967) Ltd Design Approval Organization Number 16-C-01 with the specialty of structures.
Non-aerospace engineering consulting services are provided through a strategic partnership with the Acuren Group Inc. This partnership allows John to bring a range of materials engineering and testing to projects, especially in the area of failure analysis. John also works with the Acuren NDT specialists and the aerospace inspectors of the Acuren AMO to develop NDT procedures including calibration standards.
John is an experienced mechanical engineer with over 36 years of knowledge gained from working in various industries. John uses his combination of science and engineering training to tackle difficult problems in mechanical and structural systems. His training and experience include communications and technical management skills.

  • Presenter at numerous technical conferences / Lecturer at University and Technical institutions
  • Experienced in wide range of industries including: aerospace; marine (surface and subsea); ground transportation; rail; mining; pulp & paper; oil & gas; manufacturing
  • Design and certification of aerospace modifications and repairs
  • Development of basic loads for static and dynamic applications
  • Mechanical system design and analysis including: kinematics; kinetics; and tolerance
  • Structural analysis and testing including: static analysis; stability (buckling, crippling); dynamic analysis;vibration; fatigue; fracture mechanics
  • Measurement of in-flight fatigue loads
  • Fail-Safe, Safe-Life and Damage Tolerance designs. Experienced in the development of: Supplemental Structural Inspection Programs (SSIP); Structural Inspection Documents (SID); Instructions for Continued Airworthiness (ICA) and Maintenance Manuals
  • Technical project management
  • Development of standards, specifications, proposals and technical studies
  • Finite element analysis including: linear elastic; material and geometric nonlinearity; large deflection; buckling; modal; vibration; impact; thermal; and ‘virtual prototyping’ using mechanical event simulation
  • Failure analysis including: extensive liaison experience with metallurgical and material engineers; failure investigation; root cause; and corrective action