AD 79-23-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 727-100 Series | BOEING Model 727 and 737 Series Airplanes |
| aircraft | The Boeing Company | 727-100C Series | BOEING Model 727 and 737 Series Airplanes |
| aircraft | The Boeing Company | 727-200 Series | BOEING Model 727 and 737 Series Airplanes |
| aircraft | The Boeing Company | 727-200F Series | BOEING Model 727 and 737 Series Airplanes |
| aircraft | The Boeing Company | 727 Series | BOEING Model 727 and 737 Series Airplanes |
| aircraft | The Boeing Company | 727C Series | BOEING Model 727 and 737 Series Airplanes |
| aircraft | The Boeing Company | 737-100 Series | BOEING Model 727 and 737 Series Airplanes |
| aircraft | The Boeing Company | 737-200 Series | BOEING Model 727 and 737 Series Airplanes |
| aircraft | The Boeing Company | 737-200C Series | BOEING Model 727 and 737 Series Airplanes |
| aircraft | The Boeing Company | 737-300 Series | BOEING Model 727 and 737 Series Airplanes |
Unsafe Condition
Failure of the straight orifice fittings on the Boeing part number 10-60513-18, -19, and -20 latch valves and manifold assemblies of the passenger oxygen service unit (PSU) manifolds could result in loss of passenger oxygen supply during emergency situations.
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Required Actions
Replace the straight orifice fittings with redesigned barbed orifice fittings and O-rings per applicable Boeing Service Bulletins and Puritan-Bennett Service Letter. Renumber and functionally test the PSU manifolds after installation.
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Compliance Time
Within 1,200 hours time-in-service or six (6) months after the effective date of this AD, whichever comes first. Compliance may be extended to 2,400 hours time-in-service or one (1) year after the effective date if operational altitude is limited to 25,000 feet.
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Affected Aircraft
Boeing Model 727 and 737 series airplanes with the 'carry-all' interior.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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