Airworthiness Directives; Bombardier, Inc., Airplanes

Built by the Tribune's code from the Federal Register. No AI wrote this page. Published in the Federal Register Jan. 21, 2026. Document 2026-01032. Updated Nov. 15, 2026.

What it does

The FAA is adopting a new airworthiness directive (AD) for all Bombardier, Inc., Model BD-100-1A10 airplanes. This AD was prompted by a report that some parts of horizontal stabilizer trim actuators (HSTAs) that were meant to be replaced through a required overhaul were not replaced and were instead reinstalled on the HSTAs. This AD requires verification of the HSTA serial number, and, if applicable, replacement of the HSTA. This AD also prohibits the installation of affected parts under certain conditions. 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 489 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

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

Since then:

What happens next and when

This AD is effective February 25, 2026.

The agency's dates, word for word.

Check it yourself

The record as published

Document number	2026-01032
Action	Final rule.
Agencies	Transportation Department; Federal Aviation Administration
Published	Jan. 21, 2026
Effective date	Feb. 25, 2026
Regulation identifier (RIN)	2120-AA64
Docket	FAA-2025-1351

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