Federal Register #AD 2026-06-03

FAA Airworthiness Directive: Diamond Aircraft DA 40 Series Fuel System Safety Update

The Federal Aviation Administration (FAA), under the Department of Transportation, has issued a final Airworthiness Directive (AD) superseding a previous directive for all Diamond Aircraft Industries Inc. (DAI) Model DA 40, DA 40 F, and DA 40 NG airplanes. - Government Buyer: - Federal Aviation Administration (FAA), Aircraft Certification Service, Compliance & Airworthiness Division - OEM Highlight: - Diamond Aircraft Industries Inc. (DAI) - Products and Services Requested: - Replacement of affected fuel tank connection hoses - Part numbers: D4D28171070 and BENOLPRESS - Inspection of fuel tank chambers - Removal of detached rubber material from fuel tank connection hoses - Compliance with Diamond Aircraft Industries Mandatory Service Bulletins (MSB 40NG064 Rev. 3, MSB 40087 Rev. 3, MSB F4037 Rev. 3) and Work Instructions (WIMSB 40087, WIMSB F4037, WIMSB 40NG064) - Notable Requirements: - Applies to all DA 40, DA 40 F, and DA 40 NG airplanes on the U.S. registry (estimated 987 aircraft) - Prohibits installation of affected hoses after compliance - Updated service material required for DA 40 NG models due to additional affected parts identified - Compliance required within 100 flight hours or 2 months after the effective date, whichever comes first - Locations: - FAA offices in Fort Worth, TX and Kansas City, MO - U.S. Department of Transportation Docket Operations, Washington, DC - Diamond Aircraft Industries Inc., London, Ontario, Canada (OEM location) - Note: - This is a regulatory safety action, not a procurement or contract award.

Description

The FAA is issuing a final rule superseding Airworthiness Directive (AD) 2020-14-06 for all Diamond Aircraft Industries Inc. Model DA 40, DA 40 F, and DA 40 NG airplanes. This AD requires replacing affected fuel tank connection hoses, inspecting fuel tank chambers, and removing detached rubber material from fuel tank connection hoses to address fuel system contamination risks. Updated service material is mandated for Model DA 40 NG airplanes due to additional affected parts identified during production. The AD aims to prevent fuel starvation and reduced airplane control, effective April 30, 2026.

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