# Proposed AD FAA-2009-1214: Bombardier, Inc. (Type Certificate Previously Held by Avro International Aerospace Division; British Aerospace, PLC; British Aerospace Commercial Aircraft Limited; British Aerospace (England)) Model BD-100-1A10 (Challenger 300) Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-07-06
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 29, 2009, 74 FR 68741
- Comments due: February 12, 2010
- Became: [AD 2010-07-06](https://openairdocs.org/ad/2010-07-06)
- Docket: FAA-2009-1214 (https://www.regulations.gov/docket/FAA-2009-1214, where comments are filed)
- Project: 2009-NM-091-AD
- FR document: E9-30651
- Official PDF: https://openairdocs.org/files/sha256/55/0d/550dfa63089a8b8f1fc355005675cb390ec12da5a668c01525a4fb81f8579fdb (from https://www.govinfo.gov/content/pkg/FR-2009-12-29/pdf/E9-30651.pdf)
- Federal Register: https://www.federalregister.gov/documents/2009/12/29/E9-30651/airworthiness-directives-bombardier-inc-type-certificate-previously-held-by-avro-international
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A638156A365ADCA08625769B0051C8E9.0001
- Page: https://openairdocs.org/proposed/FAA-2009-1214

## 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 has been an incident during a production flight test where the proximity-sensor electronic unit (PSEU) failed. This resulted in unannunciated loss of:

Wheel brakes below 10 knots; Thrust reverser; Nose wheel steering; and Auto-deployment of the multi-function spoilers.

A similar condition, if not corrected, may result in reduced controllability of the aircraft upon landing and possible overrun of the runway. * * * * *

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

## Notices in this docket

- Dec 29, 2009: Notice of proposed rulemaking (NPRM). (first notice), FR document E9-30651, comments due Feb 12, 2010 (https://www.federalregister.gov/documents/2009/12/29/E9-30651/airworthiness-directives-bombardier-inc-type-certificate-previously-held-by-avro-international)

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