Airworthiness directives › 2015-23-09
AD 2015-23-09 Airworthiness Directives; Zodiac Aerotechnics (Formerly Intertechnique Aircraft Systems)
Applicability*9
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.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
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.
Unsafe condition
This AD was prompted by a report that improper maintenance on oxygen mask regulators was found. During an inspection of the oxygen test bench, incorrect settings were noticed. This test bench setting discrepancy on the oxygen mask regulator could cause an improper mask dilution schedule. We are issuing this AD to detect and correct affected oxygen mask regulators, which could lead, in case of mask usage at or above 10,000 feet after a depressurization event, to the inhalation of air with improper content of oxygen, due to the bad dilution settings, thereby providing 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.
Affected ADs
None.
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