Federal Register #2026-09574

FAA Proposed Airworthiness Directive for Diamond Aircraft DA 40 Series Door Safety

The Federal Aviation Administration (FAA) is proposing a new airworthiness directive (AD) targeting all Diamond Aircraft Industries Inc. (DAI) Model DA 40, DA 40 F, and DA 40 NG airplanes to address safety concerns related to passenger door separation during flight. - Government Buyer: - Federal Aviation Administration (FAA), Department of Transportation - Aircraft Certification Service, Airworthiness Products Section, Operational Safety Branch - OEM Highlight: - Diamond Aircraft Industries Inc. (DAI) is the primary Original Equipment Manufacturer (OEM) involved - Products/Services Requested: - Revision of the airplane flight manual (AFM) to update operating limitations and procedures - Inspection and repair of passenger door latching and safety hook mechanisms - Measurement of passenger door handle actuation force - Replacement of components as needed, including: - Gas springs - Hook assemblies - Retaining blocks - Door guide blocks - Door sealant - Notable Requirements: - Compliance with Diamond Aircraft Mandatory Service Bulletin MSB 40103/MSB F4042/MSB D4114/MSB 40NG084 REV. 2 and associated work instructions - Some manual revisions may be performed by pilots - Inspections are required within 100 hours time-in-service or 100 days after the effective date, with some repetitive inspections every 100 hours until gas spring replacement within 12 months - The directive is expected to affect 987 airplanes in the U.S. registry - Place of Performance/Delivery: - FAA Airworthiness Products Section, Operational Safety Branch, 901 Locust, Kansas City, MO 64106 - FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590

Description

The FAA proposes a new airworthiness directive (AD) for all Diamond Aircraft Industries Inc. Model DA 40, DA 40 F, and DA 40 NG airplanes due to reports of passenger door separation during flight. The AD requires revising the airplane flight manual, inspecting and repairing various door components, measuring door handle actuation force, and replacing parts as necessary. The goal is to address the unsafe condition that could lead to damage, loss of control, and injury. Comments on the proposal are due by June 29, 2026.

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