# 2025-20921: Airworthiness Directives; Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.) Airplanes

2025-20921, Airworthiness Directives; Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.) Airplanes, is a Federal Register rule from Transportation Department, Federal Aviation Administration published 2025-11-25, effective 2025-12-30 (as of 2026-06-11).

- Canonical: https://policyrisk.com/federal-register/2025-20921
- As of: 2026-06-11
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Document number: 2025-20921
- Title: Airworthiness Directives; Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.) Airplanes
- Type: Rule
- Agencies: Transportation Department; Federal Aviation Administration
- Citation: 90 FR 53197
- Published: 2025-11-25
- Effective: 2025-12-30
- Comments close: not stated
- Significant: no
- Touches household money: no
- Regulation identifier numbers: 2120-AA64
- Last updated: 2026-06-11

## Summary

If you fly or work with Airbus Canada Model BD-500-1A10 or BD-500-1A11 planes, listen up! The FAA says some fire safety bottles might not work right, so they’re making owners replace certain parts and check fire extinguisher lines to keep everyone safe. These fixes start December 30, 2025, and help avoid costly problems down the runway.

## Abstract

The FAA is adopting a new airworthiness directive (AD) for all Airbus Canada Limited Partnership Model BD-500-1A10 and BD-500-1A11 airplanes. This AD was prompted by events where the cargo bottle fail caution message was displayed. This AD requires replacing affected low rate discharge (LRD) bottles, inspecting extinguishing discharge lines and tubes, and replacing extinguishing discharge lines and tubes, as applicable, and also prohibits the installation of affected LRD bottles. The FAA is issuing this AD to address the unsafe condition on these products.

## Effects PRIA read

- Mandatory fire-suppression fixes: benefit, medium. If you operate or maintain Airbus Canada Model BD-500-1A10 or BD-500-1A11 airplanes, you must replace affected low rate discharge (LRD) bottles, inspect extinguishing discharge lines and tubes, and replace lines/tubes as needed. The AD prohibits installing affected LRD bottles (part numbers 475086-…
- Operators face one-time compliance costs: cost, high. The FAA estimates this AD affects 74 U.S.-registered airplanes and becomes effective December 30, 2025. Estimated cost for the required actions is 16 work-hours at $85/hour = $1,360 per airplane (parts $0), totaling $100,640 for U.S. operators; on-condition work can cost up to $18,218 per product (…
- Reporting requirement removed: benefit, low. Although the Transport Canada AD referenced in this rule asks operators to submit certain information to the manufacturer, this FAA AD does not require submitting that information. This change is effective December 30, 2025.

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## Sources
- [2025-20921 on federalregister.gov](https://www.federalregister.gov/documents/2025/11/25/2025-20921/airworthiness-directives-airbus-canada-limited-partnership-type-certificate-previously-held-by-c)
- [2025-20921 as published (PDF)](https://www.govinfo.gov/content/pkg/FR-2025-11-25/pdf/2025-20921.pdf)

## Related
- [Previous: 2025-20910, Airworthiness Directives; Airbus SAS Airplanes](https://policyrisk.com/federal-register/2025-20910)
- [Next: 2025-20924, Airworthiness Directives; Airbus SAS Airplanes](https://policyrisk.com/federal-register/2025-20924)
- [All Federal Register documents](https://policyrisk.com/federal-register)

Source: PRIA, https://policyrisk.com/federal-register/2025-20921 (as of 2026-06-11).