Federal Register #FAA-2026-13809

Proposed FAA airworthiness directive for Diamond DA 50 C flap actuators

The FAA proposes an airworthiness directive addressing flap actuator safety on Diamond Aircraft Industries GmbH Model DA 50 C airplanes. - Government buyer / issuing agency: U.S. Department of Transportation, Federal Aviation Administration (FAA); no specific office is identified. - OEM: Diamond Aircraft Industries GmbH (DAI), manufacturer of the affected aircraft and actuator. - Scope: Applies to all Model DA 50 C airplanes; the FAA estimates 30 U.S.-registered airplanes would be affected. - Proposed safety actions: Inspect the flap actuator’s black slide grommet and rod-end-bearing fit, modify the actuator, and conduct repetitive inspections for broken actuator torque seals, with corrective action as needed. Installing an unmodified actuator would be prohibited. - Referenced compliance documents: DAI Work Instruction WI-MSB 50-016, Revision 0, and DAI Mandatory Service Bulletin DAI MSB 50-016. - Other proposed change in the notice: Adjust Jet Route J-21 near Laredo, Texas, to remove an unnecessary turn. - Procurement status: This is a proposed safety rule, not a purchase opportunity; no products or services, purchase quantities, or part numbers are specified.

Description

The FAA proposes a new airworthiness directive for all Diamond Aircraft Industries GmbH Model DA 50 C airplanes, prompted by reports of flap actuator failures. The proposed requirements include inspecting the flap actuator for displacement of the black slide grommet and a tight rod-end-bearing fit, modifying the actuator, and conducting repetitive inspections with applicable corrective action. Installation of unmodified flap actuators would be prohibited. Comments are due December 28, 2026.

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