Design-21 Projects

23/10/2026

Avionics, electrical, and environmental control systems engineering services ⚡

From cabin lighting to power distribution, D21 Projects supports operators and lessors with electrical modifications across the cabin, including emergency lighting, galley and lavatory supply, charging systems, PSS and PSU rearrangements.

Every change is backed by the engineering documentation required to meet applicable regulatory requirements.

EASA Minor Change or Repair approval can be provided for changes or repairs classified as Minor, in accordance with D21 Projects’ DOA Terms of Approval.

🌐 https://d21projects.com/
📩 [email protected]

21/10/2026

12/10/2026

28/09/2026

A summer evening of BBQ, laughter, and team spirit. Design-21 Projects came together to unwind, reconnect, and celebrate the commitment everyone brings to work every day. 🍖🔥

27/09/2026

Happy World Tourism Day! 🌍✈️ Every destination starts with a journey. Today, we celebrate the role of aviation in connecting people, cultures, and opportunities across the globe. Here's to safe skies, memorable travels, and the professionals who make every journey possible.
🌐 https://d21projects.com/

15/09/2026

Cabin & Cargo Compartment Engineering Services (Part 2) ✈️

Continuing our look at how D21 Projects supports cabin and cargo compartment modifications, this time covering compartment linings, crew rest areas, and emergency equipment layout updates (EEL updates, non-halon extinguishers, AED/ELT integration).

We also handle placards and markings, ownership and lease data plates, registration changes, and aircraft livery updates, all backed by the necessary engineering documentation to meet applicable regulatory requirements.
EASA Minor Change or Repair approval can be provided for changes or repairs classified as Minor, in accordance with D21 Projects' DOA Terms of Approval.

🌐 https://d21projects.com/
📧 [email protected]

27/08/2026

We are seeking a Part 21 Design Engineer! ✈️ Join our growing team as an ambitious and highly motivated engineer, working on cabin design and exterior livery modification projects for airline operators and aircraft lessors worldwide.

The successful candidate will prepare and review design and certification documentation, verify compliance with EASA airworthiness requirements, and liaise with maintenance organisations, customers, and EASA/NAA authorities throughout the project lifecycle.

📩 Apply via email: [email protected]
🔗 Learn more and apply online: https://3plexgroup.com/careers/part-21-design-engineer/

26/08/2026

Cabin & Cargo Compartment Engineering Services ✈️

From a single seat cover replacement to a full cabin reconfiguration, D21 Projects supports operators and lessors with a wide range of interior modification needs — including cabin textiles, LOPA changes, placards and branding updates, galley and lavatory work, and flight deck interiors.

Whether it’s a full cabin overhaul or a smaller cosmetic update, our engineering team ensures that every change meets applicable regulatory requirements while providing the necessary engineering documentation.

EASA Minor Change or Repair approval can be provided for changes or repairs classified as Minor, in accordance with D21 Projects’ DOA Terms of Approval.

🌐 https://d21projects.com/
📩 [email protected]