# Airworthiness Directives; Bombardier, Inc. Airplanes
> **Rule** · Final rule. · Published 2013-02-12 · Effective 2013-03-19 · 78 FR 9783
## Document
- **Document number:** 2013-02724
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 78 FR 9783
- **Publication date:** 2013-02-12
- **Effective date:** 2013-03-19
- **FAA docket:** Docket No. FAA-2012-0725
## Abstract

We are adopting a new airworthiness directive (AD) for certain Bombardier, Inc. Model CL-600-1A11 (CL-600), CL-600-2A12 (CL-601), and CL-600-2B16 (CL-601-3A, CL-601-3R, & CL-604 Variants) airplanes. This AD was prompted by reports of cracking found on the upper and lower Web of the engine support beam. This AD requires revising the maintenance program. We are issuing this AD to detect and correct fatigue cracking of the engine support beam, which could result in failure of the engine support beam and affect the structural integrity of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2013/02/12/2013-02724/airworthiness-directives-bombardier-inc-airplanes)
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