FAA Designated Engineering Representative

Aircraft Certification

Whether you're an established aircraft company or an exciting new start-up, we can help you to certify your aircraft.  Our direct experience helping certify the Kodiak 100 through nearly the entire process combined with a practical and diverse aviation background will be an asset to your project.

  • Appointed to act on behalf of the FAA to approve or recommend approval of technical data
  • 8110-3 “Statement of Compliance with the Federal Aviation Regulations” generation
  • Program management
  • Administrative DER (upon special delegation)
  • Certification plans
  • Test plans
  • Test reports
  • Component, assembly, system design
  • Review of drawings and data for design and construction compliance


Supplemental Type Certificates 

Would you like to develop a new STC?  These are some of Harrison Aero's favorite projects!  Whether you need just a little help to get the ball rolling with the FAA or you need someone to manage the entire project so that you can focus on what you do best, we can help.

  • Reverse engineering existing structures and systems
  • Product integration
  • Certification basis definition
  • Methods of compliance planning
  • Project specific certification plan development
  • Conformity inspection assistance
  • Test planning, implementation, and reporting
  • Data approval and submittal
  • Type inspection authorization coordination
  • Flight manual supplement and instructions for continued airworthiness development

Part 23 and Part 25 Major Repairs and Alterations 

Don’t you sometimes wish your mechanic could just sign off the darn change?  Well now you almost can.  Though the FAA won’t let someone act as an A&P/IA and DER at the same time, having an aircraft mechanic background gives a practical and common-sense approach to repairs and alterations.  We can help with the Approved Data you need for your 337s, and will work closely with your mechanics and technicians to come up with a solution that meets the Regulations but doesn’t turn into a PhD research project.

  • Design and analysis for repair of metallic structures
  • Design for manufacturability
  • Efficient use of commonly available materials and hardware
  • Typical substantiation by analysis, similarity, or design.
  • Non-typical substantiation by test (“…worth a thousand expert opinions”)
  • Data approval with form 8110-3

Engineering Services

Sometimes you don’t need full DER services but just an experienced engineer to perform design or analysis.  We offer dual-rate pricing that provides an affordable and convenient way to finish your project on-budget and on-time.  

  • Hand calculated stress analysis
    • Classic methods of Bruhn, Peery, Niu, Flabel, etc.
    • Boeing methods
    • Methods derived from numerous industry-accepted standards
  • Finite element analysis (ANSYS, NASTRAN, and various other software packages)
    • 2D and 3D Design
    • AutoCAD, SolidWorks, SolidEdge, Unigraphics NX, Catia V4, and various other packages
    • Developmental bodies, detail components, assemblies, systems, drafting, manufacturing aids
  • Computational Fluid Dynamics
    • XFOIL and Flow-3D airfoil development software
    • Numerous methods for deriving air and ground loads and aircraft performance

Areas of Delegation

Major Structural Repairs: Part 25 airplanes
  • Static Analysis: wing, fuselage, empennage, and flight controls
  • Design and construction: wing, fuselage, empennage and flight controls
Major Structural Repairs and Alterations: Part 23 airplanes
  • Static Analysis: wing, fuselage, empennage, landing gear, flight controls, engine mounts, and special components
  • Design and construction: wing, fuselage, empennage, landing gear, flight controls, engine mounts, and special components
  • Service Documents: wing, fuselage, empennage, landing gear, flight controls, engine mounts, and special components
  • Material and Process Specs: metallic materials
Powerplant Installations: Part 23 single engine turboprop powered airplanes
  • Fuel and Oil: airplane turboprop engine
  • Service Documents: airplane turboprop engine, fuel and oil