MTD-02-2026 - Cracking in E-Props Durandal HexMc® Propeller Hubs

This MTD is applicable to all aircraft operating under an LAA Permit to Fly fitted with an E-Props Durandal 3-blade propeller hub.

A safety concern has been identified with certain HexMc® hubs where cracks may develop near the blade bolt areas, likely linked to over-tightening and possible manufacturing issues in specific production batches.

Any HexMc® hub found to be cracked must be replaced with a serviceable, uncracked hub or the propeller replaced with an alternative propeller approved for that aircraft. Replacement hubs may be available from E-Props. Owners of cracked hubs are advised to contact E-Props directly before purchasing replacements.

Within 10 flying hours or by the next Airworthiness Review, whichever is sooner, it must be determined whether the propeller hub is of an affected type and an initial inspection carried out by an LAA Inspector. If affected, ongoing inspections are required annually or every 50 flight hours.

Please refer to the below Mandatory Technical Directive for full details, compliance times, and certification requirements.

This MTD can be found HERE and is also available below.