Airworthiness Directive · Amendment 39-18325 · Oxygen
Zodiac Aerotechnics (Formerly Intertechnique Aircraft Systems)
This AD applies to Zodiac Aerotechnics (formerly Intertechnique Aircraft Systems) flightcrew oxygen mask regulators having part number MC10, MF10, and MF20 series, with serial numbers listed in Appendix 1 of Zodiac Services Service Bulletin MCF-SBU-35-001, Revision 1, dated December 3, 2012. These oxygen mask regulators are installed on various transport and small airplanes, certificated in any category, including, but not limited to, the airplanes of the manufacturers specified in paragraphs (c)(1), (c)(2), (c)(3), (c)(4), (c)(5), (c)(6), and (c)(7) of this AD. An oxygen mask regulator having part number MC10-04-127 with serial number 48573 is affected only if it is part of part number MSE101-27 with serial number 7521.
(1) Airbus.
(2) ATR—GIE Avions de Transport Régional.
(3) The Boeing Company.
(4) Bombardier, Inc.
(5) Cessna Aircraft Company.
(6) Gulfstream Aerospace Corporation.
(7) Gulfstream Aerospace LP.
We are adopting a new airworthiness directive (AD) for certain Zodiac Aerotechnics (formerly Intertechnique Aircraft Systems) flightcrew oxygen mask regulators as installed on, but not limited to, various transport and small airplanes. This AD was prompted by a report that improper maintenance on oxygen mask regulators was found. This AD requires the identification and replacement of all potentially affected units. This AD also requires installation of a placard and revision of the airplane flight manual to include an operational procedure for use in case of depressurization. We are issuing this AD to detect and correct affected oxygen mask regulators, which could lead to inadequate protection to the affected flightcrew against hypoxia. Hypoxia can start from a headache and drowsiness and lead eventually to unconsciousness with severe consequence in terms of airplane controllability.
Within 30 days after the effective date of this AD, inspect each flightcrew oxygen mask regulator to identify the part number and serial number, in accordance with the Accomplishment Instructions of Zodiac Aerospace Service Bulletin MCF-SBU-35-001, Revision 1, dated December 3, 2012. A review of airplane maintenance records is acceptable to make the determination as specified in this paragraph, provided those records can be relied upon for that purpose, and each flightcrew oxygen mask regulator can be conclusively identified from that review.
If the part number and serial number, identified as required by paragraph (g) of this AD, are listed in Appendix 1 of Zodiac Aerospace Service Bulletin MCF-SBU-35-001, Revision 1, dated December 3, 2012, within 30 days after the effective date of this AD, accomplish the actions specified in paragraph (h)(1) or (h)(2) of this AD.
(1) Replace each affected flightcrew oxygen mask regulator with a part identified in paragraph (h)(1)(i) or (h)(1)(ii) of this AD.
(i) A serviceable part, not having a part number and serial number listed in Appendix 1 of Zodiac Aerospace Service Bulletin MCF-SBU-35-001, Revision 1, dated December 3, 2012.
(ii) A part that has been tested and passed the test in accordance with paragraph 3.A.(4) of the Accomplishment Instructions of Zodiac Aerospace Service Bulletin MCF-SBU-35-001, Revision 1, dated December 3, 2012.
(2) Do the actions specified in paragraphs (h)(2)(i) and (h)(2)(ii) of this AD.
(i) Revise the Emergency Procedures section of the airplane flight manual (AFM) by inserting the statement provided in figure 1 to paragraph (h)(2)(i) of this AD. This may be done by inserting a copy of figure 1 to paragraph (h)(2)(i) of this AD into the AFM.
| In case of depressurization, both pilots must use the mask regulator on 100% demand or Emergency mode only. |
Note 1 to paragraph (h)(2)(i) of this AD: For oxygen over-consumption, refer to applicable airplane type certificate holder limitations, if existing, depending on the airplane configuration and/or flight plan.
Note 2 to paragraph (h)(2)(i) of this AD: It is the operators' responsibility to assess the operational consequences of the oxygen over-consumption and ensure that the operational requirements with regard to supplemental oxygen and crew protective breathing equipment are still done. Operators are expected to amend, as applicable, their operations manual(s) accordingly.
(ii) Fabricate and install a placard on the flightcrew oxygen mask container that states: “USE SELECTOR on “100%” OR “EMERGENCY” ONLY.”
Within 12 months after the effective date of this AD, unless already accomplished as specified in paragraph (h)(1) of this AD, replace each affected flightcrew oxygen mask regulator identified in paragraph (h) of this AD with a part identified in paragraph (i)(1) or (i)(2) of this AD. After replacement of all affected flightcrew oxygen mask regulators on an airplane, the actions specified in paragraph (h)(2) of this AD are no longer required, the AFM revision specified in paragraph (h)(2)(i) of this AD may be removed from the AFM, and the placard identified in paragraph (h)(2)(ii) of this AD may be removed from the airplane.
(1) A serviceable part, not having a part number and serial number listed in Appendix 1 of Zodiac Aerospace Service Bulletin MCF-SBU-35-001, Revision 1, dated December 3, 2012.
(2) A part that has been tested and passed the test in accordance with paragraph 3.A.(4) of the Accomplishment Instructions of Zodiac Aerospace Service Bulletin MCF-SBU-35-001, Revision 1, dated December 3, 2012.
