Airworthiness Directives; Diamond Aircraft Industries GmbH

Built by the Tribune's code from the Federal Register. No AI wrote this page. Published in the Federal Register July 17, 2026. Document 2026-14511. Updated Nov. 8, 2026.

What it does

The FAA is adopting a new airworthiness directive (AD) for all Diamond Aircraft Industries GmbH (DAI) Model DA 42, DA 42 NG, and DA 42 M-NG airplanes. This AD was prompted by occurrences of uncommanded rudder deflection caused by a cracked nose landing gear (NLG) hydraulic actuator rod end, which could lead to failure of the NLG actuator and interference with the rudder control system, forcing the rudder into left-hand deflection. This AD requires revising the existing airplane flight manual (AFM) for your airplane to provide the flight crew with revised operating limitations, repetitively inspecting certain NLG hydraulic actuator rod ends for cracks, deformation, corrosion, damage, and free movement of the spherical bearing, and depending on the results of any inspection, replacing the affected NLG hydraulic actuator rod end with a serviceable part. This AD also prohibits the installation of an affected NLG hydraulic actuator rod end unless certain conditions are met. The FAA is issuing this AD to address the unsafe condition on these products.

The Federal Aviation Administration's summary, as published in the Federal Register.

What changed in the regulation

1 part of Title 14 of the Code of Federal Regulations:

14 CFR 39

Wording on eCFR: the day before it took effect and from the day it took effect (first part listed).

Compared with

The Federal Aviation Administration has published 482 final rules in 2026 so far, compared with 518 in all of 2025.

Counted by the Tribune from Federal Register records since Jan. 1, 2025.

Before this

906 earlier Federal Register documents under regulation identifier 2120-AA64 since Jan. 1, 2025.

July 17, 2026 Final rule. Airworthiness Directives; Bell Textron Canada Limited Helicopters
July 17, 2026 Final rule. Airworthiness Directives; General Electric Company Engines
July 16, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Bombardier, Inc., Airplanes
July 15, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG Engines
July 15, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Bell Textron Canada Limited Helicopters
July 14, 2026 Final rule. Airworthiness Directives; Bombardier, Inc., Airplanes
July 14, 2026 Final rule. Airworthiness Directives; Textron Aviation Inc. Airplanes
July 14, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Leonardo S.p.a Helicopters

Since then:

What happens next and when

This AD is effective July 20, 2026.

The agency's dates, word for word.

Check it yourself

The record as published

Document number	2026-14511
Action	Final rule; request for comments.
Agencies	Transportation Department; Federal Aviation Administration
Published	July 17, 2026
Effective date	July 20, 2026
Comments close	Aug. 31, 2026
Regulation identifier (RIN)	2120-AA64
Docket	FAA-2026-7216

Source: the Federal Register (public domain). The document in the Federal Register