We Focus On Safety

FAA Designated Engineering Representatives

Facilitating All Aircraft and Helicopters (FAR 23, 25, 27, 29)

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Our Company History

D.E.R. Associates Ltd. was established as a sole proprietorship in July of 1990 and became a Kansas Corporation April 1, 1993. We have over 43 years of aircraft experience and we are facilitating all aircraft and helicopters.

D.E.R. Associates Ltd. is a Engineering Consulting Firm organized by Designated Engineering Representatives in order to provide Aircraft engineering and design services to the Aviation Industry.

Do you need an RS DER to help with your Repair Specs?

You have come to the right place.

We have several RS DERs on staff, both for aircraft and helicopters.

D.E.R. Associates LTD. offices are located in Mulvane, Kansas, the heart of the Midwest and just minutes from Wichita’s Eisenhower Airport.

Here’s What We Can Do For You

At DER, we strive only for the best and our first priority is always safety.


  • Antenna Installations
  • Anti-Ice Modifications
  • Flight Inspection Systems
  • Camera Mods/Installations
  • Aircraft Skin Modifications
  • GPS Installations
  • Structural Repair
  • Wing/Leading Edge Mods
  • Engine Conversion
  • Certification / Conformity Issues
  • Ergonomics
  • Drafting and Engineering Service
  • AFM and Manual Design
  • Structural / Stress Analysis

Aircraft Interior/Exterior Modifications

  • Cabinet Mods/Installations
  • Cargo/Baggage Installations
  • Window Mods/Installations
  • Table Modifications
  • Small Aircraft Part Design/Instl
  • STC / PMA Coordination &
  • Implementation APU Modifications DER / DAR Service
  • ELA Reports
  • Compliance Checklists
  • Project Coordination
  • Burn Testing
  • Paint Scheme Design
  • Export Assistance

Contact Us

We’re Always Happy to Help!

D.E.R. Associates LTD. offices are located in Mulvane, Kansas. Kansas is the heart of the aviation industry!

Our hours are :
Monday – Friday
8:00 AM to 4:00 PM (Central Time)

Physical Address:
7200 E 103rd St S
Mulvane, KS 67110

Phone: 316-946-0125
Fax: 316-946-0349
Email: jocy@faader.com

Fill out the form below to send us a message.