AD 2015-23-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Zodiac | Aerotechnics (Formerly Intertechnique | Airworthiness Directives; Zodiac Aerotechnics (Formerly Intertechnique Aircraft Systems) |
Unsafe Condition
Improper maintenance on flightcrew oxygen mask regulators could cause incorrect settings on the oxygen test bench, leading to an improper mask dilution schedule. This could result in inadequate protection against hypoxia during a depressurization event above 10,000 feet.
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Required Actions
Identify and replace all potentially affected oxygen mask regulators. Install a placard and revise the airplane flight manual to include an operational procedure for use in case of depressurization.
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Compliance Time
Before further flight
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Affected Aircraft
Zodiac Aerotechnics (formerly Intertechnique Aircraft Systems) flightcrew oxygen mask regulators with part numbers MC10, MF10, and MF20 series, and serial numbers listed in Appendix 1 of Zodiac Services Service Bulletin MCF-SBU-35-001, Revision 1, dated December 3, 2012. These regulators are installed on various transport and small airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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