Designated engineering, airworthiness, and manufacturing inspection — in-house, ANAB-accredited, available worldwide.
The FAA's Designated Engineering Representative (DER) program lets qualified individuals approve technical data on the FAA's behalf. For aircraft modifiers, MROs, and operators, retaining an experienced DER is the difference between an approval that ships and a project that stalls in coordination.
LB Aircraft Engineering employs FAA DERs, DARs, and DMIRs as part of our permanent staff — not subcontracted. That means tightly integrated certification work, predictable schedules, and a single point of accountability from the first drawing through Form 8110-3 issuance.
Our DERs prepare and approve the technical data the FAA accepts as showing compliance with applicable airworthiness regulations. Typical deliverables include:
We support DER work in three common engagement structures:
A DER (Designated Engineering Representative) approves technical engineering data — essentially saying the design and substantiation comply with the FARs. A DAR (Designated Airworthiness Representative) issues airworthiness documents like Special Flight Permits and Export C of As, and performs conformity inspection. We have both in-house.
Yes — if the data falls within their delegated authorization. Our Systems & Equipment and Electrical Systems DERs regularly support major alteration data, repair approvals, and Form 337 substantiation for Part 121, 135, and corporate operators.
Our DERs prepare data with EASA validation in mind. While DERs are an FAA construct, the engineering compliance work translates cleanly into the EASA Part 21J framework, which speeds foreign authority validation.
Tell us your aircraft, the modification, and your schedule. We'll match the right DER discipline and propose an engagement model.
Request a Consultation +1 (305) 704-8734