AD 2018-09-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Conductive oxygen hoses in the flight deck were addressed previously in AD 2010-16-05, Amendment 39-16382 (75 FR 47208, August 5, 2010). The gaseous passenger oxygen system equipped with therapeutic oxygen is not continuously pressurized and must be activated by the flightcrew. Exposure to electrical faults, such as unintended short circuits, can result in localized electrical heating of the low-pressure oxygen flex-hoses. This condition, if not corrected, could result in electrical current passing through the low-pressure oxygen flex-hoses, which can cause flex-hoses to melt or burn, and a consequent oxygen-fed fire in the passenger cabin.
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Required Actions
Replacing certain low-pressure oxygen flex-hoses with new non-conductive low-pressure oxygen flex-hoses in the gaseous passenger oxygen system in airplanes equipped with therapeutic oxygen. A general visual inspection of the low-pressure passenger oxygen system to ensure there is minimum clearance of the oxygen system components from adjacent structure and systems.
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Compliance Time
Within 50 flight hours
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Affected Aircraft
The Boeing Company Model 747-200B, 747-300, and 747-400 series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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