Transport Transports Canada Canada TP 7245E



# AIRWORTHINESS DIRECTIVE

The following airworthiness directive (AD) may be applicable to an aircraft which our records indicate is registered in your na me. ADs are issued pursuant to Canadian Aviation Regulation (CAR) 521 Division X . Pursuant to CAR 605.84 and the further details of CAR Standard 625, Appendix H , the continuing airworthiness of a Canadian registered aircraft is contingent upon compliance with all applicable ADs. Failure to comply with the requirements of an AD ma y invalidate the flight authorization of the aircraft. Alternative means of compliance shall be applied for in accordance with CAR 605.84 and the above-referenced Standard

. This AD has been issued b y the Continuin g Airworthiness Division ( AARDG ) , National Aircraft Certification Branch, Trans p ort Canada, Ottawa, tele p hone 613 952-4357.

Pursuant to CAR 202.51 the registered owner of a Canadian aircraft shall, within seven days, notify the Minister in writing of any change of his or her name or address. To request a change of address, contact the Civil Aviation Communicat ions Centre (AARC) at Place de Ville, Ottawa, Ontario K1A 0N8 , or 1-800-305-2059 , or www.tc.gc.ca/civilaviation/communications/centre/ addr ess.asp
2 4-0022 ( 01-2005 ) 1/2 No

. CF-2011-28 Issue Date 28 July 2011

Number: CF- 2011-28 Subject: Oxygen Supply System – Deformati on of the Pressure Regulator on the Oxygen Cylinder and Regulator Assembly
Effective: 18 August 2011 Applicability: Bombardier Inc. Aeroplanes: Model CL-600-2C10, Serial Numbers 10002 through 10999 Model CL-600-2D15 and CL-600-2D24, Serial Numbers 15001 through 15990 Model CL-600-2E25, Serial Numbers 19001 through 19990 Compliance: As indicated below, unless already accomplished Background: During a routine inspection, deformation was f ound at the neck of the pressure regulator body on the oxygen Cylinder and Regulator Assemblies (CRA) of a BD-700-1A11 aeroplane.
A n investigation by the vendor , Avox Systems Inc., reveal ed that the deformation was attributed to two (2) batches of raw materi al that did not meet the required tensile strength. This may cause elongation of the pre ssure regulator neck, which could result in rupture of the oxygen cylinder, and in the ca se of cabin depressurization, oxygen would not be available when required. Although there have been no reported failu res to date on any CL-600-2C10, CL-600-2D15, CL-600-2D24 or CL-600-2E25 aeroplanes, similar oxygen pressure regulators, Part Number (P/N) 806370-06, could also be installed on the aeroplanes listed in the Applicability se ction of this directive. This directive mandates the replacement of oxygen CRAs containing pressure regulators that do not meet the required material properties.
Corrective Actions: Within 1800 hours air time from the effective date of this directive, but no later than 31 December 2011: Note: The compliance time in this directive differs from the recommended compliance time mentioned in the Bombardier Service Bulletin (SB). Part I – Inspection of the oxygen pressure regulator serial number
A. Inspect the serial number of each o xygen pressure regulator, P/N 806370-06, to determine if the serial number is listed in Table 2 of the Bombardier Service Bulletin (SB) 670BA-35-011, dated 5 July 2011, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada.No. N ° CF-2011-28 2/2

B. If the serial number of the pressure r egulator, P/N 806370-06, is listed in Table 2 of the above-mentioned SB, proceed to Part II of this directive.
C. If the serial number of the pressure r egulator, P/N 806370-06, is not listed in Table 2 of the above-mentioned SB, proceed to Part III of this directive. Part II – Replacement of the affected oxygen CRA Replace the affected oxygen CRA in accordance with the accomplishment instructions of the above-mentioned SB.
Part III – Future Installation of the oxygen CRA
A s of the effective date of th is directive, installation of an oxygen pressure regulator, P/N 806370-06, with a S/N listed in Table 2 of the Bombardier SB 670BA-35-011, dated 5 July 2011, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada, is not permitted on any CL -600-2C10, CL-600-2D15, CL-600-2D24 or CL-600-2E25 aeroplane unless the serial number has a suffix “A” beside the serial number.
Authorization: For the Minister of Transport, Infrastructure and Communities 

### ORIGINAL SIGNED BY Robin Lau Acting Chief, Continuing Airworthiness
Contact: Mr. Robert Farinas, Continuing Airworthiness, Ottawa, telephone 613-952-4357, facsimile 613-996-9178 or e-mail CAWWEBFeedback@tc.gc.ca or any Transport Canada Centre.