Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

Built by the Tribune's code from the Federal Register. No AI wrote this page. Published in the Federal Register April 29, 2026. Document 2026-08303. Updated Nov. 12, 2026.

What it does

The FAA is adopting a new airworthiness directive (AD) for certain De Havilland Aircraft of Canada Limited Model DHC-8-401 and - 402 airplanes. This AD was prompted by multiple in-service reports of cracks in elevator power control unit (PCU) brackets (fittings) and the elevator front spar. This AD requires replacing bushings and installing new washers on the elevator PCU arm fitting assembly, installing doublers at the front spar of the elevator structure assembly, replacing horizontal stabilizer rear spar elevator PCU fittings, and applicable on-conditions actions. 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

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

April 29, 2026 Final rule; request for comments. Airworthiness Directives; Airbus Helicopters Deutschland GmbH (AHD) Helicopters
April 29, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Textron Aviation Inc. Airplanes
April 29, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Leonardo S.p.a. Helicopters
April 29, 2026 Final rule. Airworthiness Directives; The Boeing Company Airplanes
April 29, 2026 Final rule. Airworthiness Directives; ATR-GIE Avions de Transport Régional Airplanes
April 29, 2026 Final rule. Airworthiness Directives; The Boeing Company Airplanes
April 29, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Bombardier, Inc., Airplanes
April 29, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus SAS Airplanes

Since then:

What happens next and when

This AD is effective June 3, 2026.

The agency's dates, word for word.

Check it yourself

The record as published

Document number	2026-08303
Action	Final rule.
Agencies	Transportation Department; Federal Aviation Administration
Published	April 29, 2026
Effective date	June 3, 2026
Regulation identifier (RIN)	2120-AA64
Docket	FAA-2025-5402

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