AD Amdt-39-10039
Unsafe Condition
The connector orifice in the Series 174290 Constant Flow Airline Portable Oxygen Masks could restrict more than half of the oxygen flow to the passenger.
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Required Actions
Replace any affected masks with an FAA-approved mask that incorporates a part number not covered by this AD. The replacement must be completed for masks manufactured between September 1992 and August 1996.
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Compliance Time
Before further flight
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Affected Aircraft
Puritan Bennett Aero Systems Company Series 174290 Constant Flow Airline Portable Oxygen Masks, Part Numbers 174290-14, 174290-24, 174290-34, 174290-44, and 174290-54, manufactured between September 1992 and August 1996.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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