Airworthiness Directive · Amendment 39-17097 · Oxygen
Bombardier, Inc. Airplanes
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.
We are adopting a new airworthiness directive (AD) for certain Bombardier, Inc. Model BD-100-1A10 (Challenger 300) airplanes. 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). This AD requires an inspection to determine if a certain oxygen CRA is installed and the replacement of affected oxygen CRAs. 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.
