# Airworthiness Directives; Bombardier, Inc. Airplanes
> **Rule** · Final rule. · Published 2015-02-04 · Effective 2015-03-11 · 80 FR 5902
## Document
- **Document number:** 2015-01187
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 80 FR 5902
- **Publication date:** 2015-02-04
- **Effective date:** 2015-03-11
- **FAA docket:** Docket No. FAA-2014-0446
## Abstract

We are adopting a new airworthiness directive (AD) for certain Bombardier, Inc. Model CL-215-6B11 (CL-215T Variant), and CL-215-6B11 (CL-415 Variant) airplanes. This AD was prompted by a report that, during a routine inspection, corrosion was discovered on the lower bearing of the rudder upper torque tube. This AD requires applying grease to the bearing; doing a general visual inspection of the expelled old grease for any contaminants, metal wear, and indication of corrosion, and replacing the bearing if necessary; and revising the maintenance or inspection program, as applicable, to incorporate the rudder spring tab operational test and a check of the rudder spring tab operation into the daily inspection. We are issuing this AD to prevent corroded bearings, which could result in a partial or total loss of axial support.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2015/02/04/2015-01187/airworthiness-directives-bombardier-inc-airplanes)
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