AD 2006-12-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747-400 | Airworthiness Directives; Boeing Model 747-400 Series Airplanes |
Unsafe Condition
Certain oxygen cylinder supports may not have been properly heat-treated, potentially leading to failure under the most critical flight load conditions, causing the oxygen cylinder to come loose and leak oxygen.
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Required Actions
Inspect the support bracket of the crew oxygen cylinder installation to determine the manufacturing date marked on the support. Perform corrective action if necessary, in accordance with Boeing Special Attention Service Bulletin 747-35-2114. Corrective action must be completed before further flight after inspection.
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Compliance Time
Within 18 months after the effective date of the AD, or before further flight if the configuration of the crew oxygen cylinder installation is changed from a one-cylinder to a two-cylinder configuration.
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Affected Aircraft
Boeing Model 747-400 series airplanes, certificated in any category, as identified in Boeing Special Attention Service Bulletin 747-35-2114, dated December 19, 2002.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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