AD 2012-12-17

This airworthiness directive (AD) becomes effective July 30, 2012.

None.

This AD applies to Bombardier, Inc. Model BD-100-1A10 (Challenger 300) airplanes, certificated in any category, serial numbers (S/N)s 20003 and subsequent.

Air Transport Association (ATA) of America Code 35: Oxygen.

This AD was prompted by reports of deformation found at the neck of the pressure regulator body on the oxygen cylinder and regulator assembly (CRA). We are issuing this AD to prevent elongation of the pressure regulator neck, which could result in rupture of the oxygen cylinder, and in the case of cabin depressurization, oxygen not being available when required.

You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.

For airplanes having S/Ns 20003 through 20291 inclusive: Within 750 flight hours, or within 6 months after the effective date of this AD, whichever occurs first, inspect oxygen pressure regulators having part number (P/N) 806370-06 or 806370-14, to determine the serial number, in accordance with paragraph 2.B.(2) of the Accomplishment Instructions of Bombardier Service Bulletin 100-35-05, Revision 02, dated January 31, 2011.

(1) If the serial number of the oxygen pressure regulator is listed in table 2 of the Accomplishment Instructions of Bombardier Service Bulletin 100-35-05, Revision 02, dated January 31, 2011, replace the affected oxygen CRA, in accordance with paragraph 2.C. of the Accomplishment Instructions of Bombardier Service Bulletin 100-35-05, Revision 02, dated January 31, 2011.

(2) If the serial number of the oxygen pressure regulator is not listed in table 2 of the Accomplishment Instructions of Bombardier Service Bulletin 100-35-05, Revision 02, dated January 31, 2011, no further action is required by this paragraph.

For all airplanes: As of the effective date of this AD, no person may install an oxygen pressure regulator (P/N 806370-06 or 806370-14) having any serial number listed in table 2 of the Accomplishment Instructions of Bombardier Service Bulletin 100-35-05, Revision 02, dated January 31, 2011, on any airplane, unless a suffix “-A” is beside the serial number.

The following provisions also apply to this AD:

(1) Alternative Methods of Compliance (AMOCs): The Manager, New York Aircraft Certification Office (ACO), ANE-170, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. In accordance with 14 CFR 39.19, send your request to your principal inspector or local Flight Standards District Office, as appropriate. If sending information directly to the ACO, send it to Attn: Program Manager, Continuing Operational Safety, FAA, New York ACO, 1600 Stewart Avenue, Suite 410, Westbury, New York 11590; telephone 516-228-7300; fax 516-794-5531. Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the local flight standards district office/certificate holding district office. The AMOC approval letter must specifically reference this AD.

(2) Airworthy Product: For any requirement in this AD to obtain corrective actions from a manufacturer or other source, use these actions if they are FAA-approved. Corrective actions are considered FAA-approved if they are approved by the State of Design Authority (or their delegated agent). You are required to assure the product is airworthy before it is returned to service.

Refer to MCAI Canadian Airworthiness Directive CF-2011-09, dated May 13, 2011; and Bombardier Service Bulletin 100-35-05, Revision 02, dated January 31, 2011; for related information.

(1) The Director of the Federal Register approved the incorporation by reference (IBR) of the following service information under 5 U.S.C. 552(a) and 1 CFR part 51.

(2) You must use the following service information to do the actions required by this AD, unless the AD specifies otherwise.

(i) Bombardier Service Bulletin 100-35-05, Revision 02, dated January 31, 2011.

(3) For service information identified in this AD, contact Bombardier, Inc., 400 Côte-Vertu Road West, Dorval, Québec H4S 1Y9, Canada; telephone 514-855-5000; fax 514-855-7401; email thd.crj@aero.bombardier.com; Internet http://www.bombardier.com.

(4) You may review copies of the service information at the FAA, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, Washington. For information on the availability of this material at the FAA, call 425-227-1221.

(5) You may also review copies of the service information that is incorporated by reference at the National Archives and Records Administration (NARA). For information on the availability of this material at an NARA facility, call 202-741-6030, or go to http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html.