Airworthiness Directives; Diamond Aircraft Industries Inc. Airplanes

Built by the Tribune's code from the Federal Register. No AI wrote this page. Published in the Federal Register March 26, 2026. Document 2026-05883. Updated Nov. 13, 2026.

What it does

The FAA is superseding Airworthiness Directive (AD) 2020-14- 06, which applied to all Diamond Aircraft Industries Inc. (DAI) Model DA 40, DA 40 F, and DA 40 NG airplanes. AD 2020-14-06 required replacing affected parts, inspecting the fuel tank chambers, and removing rubber material that has detached from the fuel tank connection hoses. AD 2020-14-06 also prohibited installing an affected part on any airplane. Since the FAA issued AD 2020-14-06, additional affected parts installed during production on Model DA 40 NG airplanes have been reported. As a result, the manufacturer has published updated service material for the Model DA 40 NG. This AD requires the same actions as AD 2020-14-06 and requires updated service material to be used for the Model DA 40 NG airplanes. 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 488 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

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

Since then:

What happens next and when

This AD is effective April 30, 2026.

The agency's dates, word for word.

Check it yourself

The record as published

Document number	2026-05883
Action	Final rule.
Agencies	Transportation Department; Federal Aviation Administration
Published	March 26, 2026
Effective date	April 30, 2026
Regulation identifier (RIN)	2120-AA64
Docket	FAA-2025-5397

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