AD 99-08-21
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Puritan-Bennett Aero Systems | C351-2000 series passenger oxygen masks | Airworthiness Directives; Puritan-Bennett Aero Systems Company C351-2000 Series Passenger Oxygen Masks and Portable Oxygen Masks |
Unsafe Condition
Tears around the face cushion adjacent to the inner mask housing due to a manufacturing defect in masks with an elastomer cure date between September 1993 and March 1997.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect passenger and portable oxygen masks for tears around the face cushion adjacent to the inner mask housing. Replace or repair any torn masks with ones having an elastomer cure date later than March 1997.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 6 calendar months of the effective date (June 2, 1999).
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Puritan-Bennett Aero Systems Company C351-2000 series passenger oxygen masks and portable oxygen masks with elastomer cure dates between September 1993 and March 1997.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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