# Proposed AD FAA-2009-0310: Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2009-23-02
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 6, 2009, 74 FR 15399
- Comments due: May 6, 2009
- Became: [AD 2009-23-02](https://openairdocs.org/ad/2009-23-02)
- Docket: FAA-2009-0310 (https://www.regulations.gov/docket/FAA-2009-0310, where comments are filed)
- Project: 2009-NM-012-AD
- FR document: E9-7643
- Official PDF: https://openairdocs.org/files/sha256/f3/23/f32395e32cb3f31b44a96a137522c7e59b4e45271afdac60828665cb36c8b192 (from https://www.govinfo.gov/content/pkg/FR-2009-04-06/pdf/E9-7643.pdf)
- Federal Register: https://www.federalregister.gov/documents/2009/04/06/E9-7643/airworthiness-directives-bombardier-model-cl-600-2b19-regional-jet-series-100-and-440-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4F4981B1DFF54A738625759000700FB8.0001
- Page: https://openairdocs.org/proposed/FAA-2009-0310

## Summary

We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:

During the Acceptance Test Procedure (ATP) of returned Inboard Flap Actuators * * * an excessive wear condition was identified regarding endplay between the flap actuator and ball screw. Excessive wear of the screw and ball nut could potentially lead to a flap system jam. * * *

* * * * * The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.

## Notices in this docket

- Apr 6, 2009: Notice of proposed rulemaking (NPRM). (first notice), FR document E9-7643, comments due May 6, 2009 (https://www.federalregister.gov/documents/2009/04/06/E9-7643/airworthiness-directives-bombardier-model-cl-600-2b19-regional-jet-series-100-and-440-airplanes)

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