Airworthiness Directive · Amendment 39-17056 · Oxygen
Bombardier, Inc. Airplanes
This AD applies to the airplanes identified in paragraphs (c)(1), (c)(2), and (c)(3) of this AD, certificated in any category.
(1) Bombardier, Inc. Model CL-600-2C10 (Regional Jet Series 700, 701, & 702) airplanes, serial numbers 10002 through 10999 inclusive.
(2) Bombardier, Inc. Model CL-600-2D15 (Regional Jet Series 705) and CL-600-2D24 (Regional Jet Series 900) airplanes, serial numbers 15001 through 15990 inclusive.
(3) Bombardier, Inc. Model CL-600-2E25 (Regional Jet Series 1000) airplanes, serial numbers 19001 through 19990 inclusive.
We are adopting a new airworthiness directive (AD) for certain Bombardier, Inc. Model CL-600-2C10 (Regional Jet Series 700, 701, & 702); CL-600-2D15 (Regional Jet Series 705); CL-600-2D24 (Regional Jet Series 900); and CL-600-2E25 (Regional Jet Series 1000) airplanes. This AD was prompted by reports of deformation of the pressure regulator on the oxygen cylinder, which was attributed to batches of raw material that did not meet required tensile strength. This AD requires an inspection to determine if certain oxygen pressure regulators are installed, and replacement of oxygen cylinder and regulator assemblies (CRAs) containing pressure regulators that do not meet required material properties. 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 would not be 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.
Within 1,800 flight hours or 6 months after the effective date of this AD, whichever occurs first: Inspect the serial number of each oxygen pressure regulator, part number (P/N) 806370-06, to determine if the serial number of the regulator is listed in “Table 2: Regulators” of paragraph 1.A.(1) of Bombardier Service Bulletin 670BA-35-011, dated July 5, 2011. If the serial number of the oxygen pressure regulator, P/N 806370-06, is listed in “Table 2: Regulators” of paragraph 1.A.(1) of Bombardier Service Bulletin 670BA-35-011, dated July 5, 2011: Before further flight, replace the affected oxygen cylinder and regulator assembly (CRA), in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 670BA-35-011, dated July 5, 2011.
As of the effective date of this AD, no person may install an oxygen pressure regulator, P/N 806370-06, having a serial number listed in “Table 2: Regulators” of paragraph 1.A.(1) of Bombardier Service Bulletin 670BA-35-011, dated July 5, 2011, on any airplane unless the serial number of the CRA and pressure regulator have a suffix “A” beside the serial number.
