E-PROPS: EASA/DGAC & ASTM certifications / Service Bulletins

E-PROPS is engaged in a European certification process (EASA) covering propeller design, production, product certification and maintenance. These approvals and certificates complement each other, in the following sequence:

1) POA – Part 21 Subpart G (Production Organisation Approval) – Production

The POA is the Production Organisation Approval: it certifies that the manufacturer has full control of its industrial processes (quality, traceability, conformity) to produce aeronautical products in accordance with an approved design definition. At E-PROPS, the Part-21G POA is currently in progress (under instruction in France via OSAC within the EASA system). See also: our workshops and production equipment.

2) DOA – Part 21 Subpart J (Design Organisation Approval) – Design

The DOA is the Design Organisation Approval: it recognises an organisation's capability to design and substantiate compliance (airworthiness) of a product, as well as its evolutions (changes/repairs), in accordance with Part-21. The Part-21J DOA of E-PROPS is currently under instruction with EASA.

3) TC – Type Certificate – Product certification

A Type Certificate (TC) is an EASA certificate confirming that a propeller model or range complies with its certification basis (technical requirements + demonstration of compliance with a reference standard). Obtaining a TC requires a complete test campaign, including structural testing and extensive vibration testing.

E-PROPS already holds an EASA Type Certificate P.512. The range of three-blade propellers for geared engines DURANDAL - EPGU3 was certified by EASA in March 2023 under the CS-22 Subpart J standard.

=> EASA P.512 (EPGU3), dated 2 March 2023
=> Available on the EASA website: EASA.P.512 – E-Props EPGU3 series propeller
=> EPGU3 installation and maintenance manual

The TC for the ASCALON range (2- and 3-blade, for direct-drive engines) is currently under instruction by EASA. Further TC applications, for other E-PROPS propeller ranges, will follow.

4) STC – Supplemental Type Certificate – Installation (aircraft + engine + propeller)

An STC is an EASA approval for a major modification to an already certified product. A propeller STC is specific to each combination (airframe + engine + propeller) and requires a dedicated test campaign to demonstrate compliance in that configuration. Prerequisite: holding the TC (or an equivalent certification basis) for the propeller range concerned.

5) Part-145 – Maintenance Organisation Approval – Maintenance

Part-145 is the Maintenance Organisation Approval (repair/maintenance) to ensure the continuing airworthiness of aeronautical products and components. E-PROPS plans to apply for a Part-145 approval for propeller maintenance.

Certification is at the heart of E-Props' approach: it is a mark of seriousness, industrial reliability and quality-system maturity, directly benefiting customers, integrators and certification authorities. In 2026, seven engineers are dedicated to these activities, reflecting the company's human and technical commitment to these demanding processes.

E-PROPS propellers (DURANDAL, EXCALIBUR, GLORIEUSE ranges) meet the ASTM F2506-26 standard for Light Sport Aircraft (LSA).

The ASTM F2506-26 standard sets minimum requirements for the design, testing and quality assurance of fixed-pitch, ground-adjustable and in-flight variable-pitch propellers for LSA-regulated light aircraft. Traction testing, mechanical strength measurement, fatigue testing, endurance testing and teardown inspections were carried out to meet the prescribed requirements.

Service Bulletins are issued by manufacturers of aeronautical products. They are established to warn users of a technical issue, a novelty or an improvement to an aeronautical product, and to convey technical information about the use of that product. E-PROPS Service Bulletins are listed below.

A Service Letter is issued to draw attention to a piece of information.

• V20 – Replacement of M4 screws — 27-03-2023
• Change of part numbering system — Durandal series — 02-03-2022

DULV validations (Germany)

The DULV (Deutscher Ultraleichtflugverband), mandated by the German Federal Ministry of Transport, issues the "Gerätekennblätter": the type data sheets that define, for each ultralight aircraft approved in Germany, its approved engine/propeller configuration. This German approval is an important reference in Germany and in many Central and Eastern European countries. Below is the list of configurations approved by the DULV with an E-Props propeller, with a link to each official data sheet:

DAeC validations (Germany)

The DAeC (Deutscher Aero Club), through its Air Sports Equipment Office (Luftsportgeräte-Büro), remains fully entitled to issue approvals and "Gerätekennblätter" for ultralight aircraft in Germany, just like the DULV. In practice, most new applications are nowadays filed with the DULV, which is more service-oriented. Here are the configurations approved by the DAeC with an E-Props propeller: