Airworthiness Directives; Airbus Helicopters Deutschland GmbH (AHD) Helicopters

Built by the Tribune's code from the Federal Register. No AI wrote this page. Published in the Federal Register May 13, 2026. Document 2026-09521. Updated Nov. 11, 2026.

What it does

The FAA is adopting a new airworthiness directive (AD) for all Airbus Helicopters Deutschland GmbH (AHD) Model MBB-BK 117 C-2 and MBB- BK 117 D-2 helicopters. This AD was prompted by a determination that a certain part-numbered standard MS18027 type hook may be subject to localized yielding in the mating threads when assembled to higher assembly torques. This AD requires modifying and re-identifying the affected part or replacing the affected part with a serviceable part. This AD also prohibits installing an affected part on any helicopter unless certain requirements 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 485 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

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

Since then:

What happens next and when

This AD is effective June 17, 2026.

The agency's dates, word for word.

Check it yourself

The record as published

Document number	2026-09521
Action	Final rule.
Agencies	Transportation Department; Federal Aviation Administration
Published	May 13, 2026
Effective date	June 17, 2026
Regulation identifier (RIN)	2120-AA64
Docket	FAA-2026-0730

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