AD 2026-06-03: Diamond Aircraft Industries Inc. Airplanes

What the FAA requires

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.

Read the full directive on the Federal Register →

Applicability

This AD applies to all Diamond Aircraft Industries Inc. Model DA 40, DA 40 F, and DA 40 NG airplanes (including Model DA 40 NG airplanes that have been converted from the Model DA 40 D), certificated in any category. (d) Subject Joint Aircraft System Component (JASC) Code 1410, Hoses and tubes. (e) Unsafe Condition This AD was prompted by reports of fuel tank connection hose deterioration and reports of affected parts that were installed during production on Model DA 40 NG airplanes. The FAA is issuing this AD to detect and address such deterioration, which, if not corrected, could result in contamination of the fuel system and restriction of fuel flow and could lead to fuel starvation and r

Part numbers this directive names (1)

Extracted from the directive text. For each: the NSN cross-reference where one exists, sellers listing it here, and open DLA solicitations on the NSN.