# Proposed AD FAA-2011-0564: Bombardier, Inc. Model CL-600-2B19 (Regional Jet Series 100 & 440); Model CL-600-2C10 (Regional Jet Series 700, 701, & 702); Model CL-600-2D15 (Regional Jet Series 705); and Model CL-600-2D24 (Regional Jet Series 900) Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2011-21-07
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 9, 2011, 76 FR 33658
- Comments due: July 25, 2011
- Became: [AD 2011-21-07](https://openairdocs.org/ad/2011-21-07)
- Docket: FAA-2011-0564 (https://www.regulations.gov/docket/FAA-2011-0564, where comments are filed)
- Project: 2011-NM-021-AD
- FR document: 2011-14348
- Official PDF: https://openairdocs.org/files/sha256/04/63/0463f2095bc68065841d899e3838065906b40461261879dac7431ac5740ec409 (from https://www.govinfo.gov/content/pkg/FR-2011-06-09/pdf/2011-14348.pdf)
- Federal Register: https://www.federalregister.gov/documents/2011/06/09/2011-14348/airworthiness-directives-bombardier-inc-model-cl-600-2b19-regional-jet-series-100-and-440-model
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F17A95B17FBB734A862578AA0047F255.0001
- Page: https://openairdocs.org/proposed/FAA-2011-0564

## 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:

There have been several in-service reports of airspeed mismatch between the pilot and co-pilot's airspeed indicators. It was discovered that during or after heavy rain, the pitot-static tubing may become partially or completely blocked by water, which fails to enter the drain bottles. Investigation revealed that drain bottles used in the primary pitot-static system include check valves, which impede the entry of water into the drain bottle. This condition, if not corrected, may result in erroneous airspeed and altitude indications.

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

## Notices in this docket

- Jun 9, 2011: Notice of proposed rulemaking (NPRM). (first notice), FR document 2011-14348, comments due Jul 25, 2011 (https://www.federalregister.gov/documents/2011/06/09/2011-14348/airworthiness-directives-bombardier-inc-model-cl-600-2b19-regional-jet-series-100-and-440-model)

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