AD 2007-26-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747-200B | Airworthiness Directives; Boeing Model 747-200B, 747-300, and 747-400 Series Airplanes |
Unsafe Condition
The in-line flow indicators of the passenger oxygen masks can fracture and separate due to internal residual stresses caused by the flow indicator joint design and manufacturing processes, inhibiting oxygen flow to the masks.
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Required Actions
Inspect the oxygen masks in specified locations to determine the manufacturer and manufacture date. Investigate and replace oxygen mask assemblies with new or modified assemblies having improved flow indicators if the existing masks have non-green flow direction marks or show specific ID label characteristics.
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Compliance Time
Before further flight
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Affected Aircraft
Boeing Model 747-200B, 747-300, and 747-400 series airplanes, specifically focusing on oxygen masks in passenger service units, flight attendant service units, flightcrew rest areas, door 5 overhead crew rest, lavatory modules, and miscellaneous ceiling panels.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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