AD 81-08-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Puritan-Bennett Aero Systems | Oxygen Masks | Airworthiness Directives; PURITAN-BENNETT AERO SYSTEMS COMPANY Oxygen Masks P/N 174039, 174010-01, 174010-03, and ZMR100 Series |
Unsafe Condition
The regulator inlet valve may cause leakage or positive pressure within the facecone.
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Required Actions
Remove diaphragm assembly P/N F334-1001-1 and install modified diaphragm assembly with diaphragm and plate assembly P/N F334-1003-1, Revision E. Permanently mark 'M' near the mask serial number. Return masks to Puritan-Bennett for modification unless ZMR100 series masks use approved field procedures.
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Compliance Time
Within 120 calendar days from the effective date of this Airworthiness Directive
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Affected Aircraft
Puritan-Bennett Aero Systems Company oxygen masks P/N 174039 (S/N 0001-0012), 174010-01/03 (S/N 00100-00144, 146-147, 149, 00150-00194, 195-259, 261-273, 275-292, 294-390), and ZMR100 series (S/N 6603-7234). Masks without serial numbers are unaffected.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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