AD 94-03-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-200B Series | Airworthiness Directives; BOEING Model 747-200B, -200C, -300, -400, and -400D Series Airplanes |
| aircraft | The Boeing Company | 747-200C Series | Airworthiness Directives; BOEING Model 747-200B, -200C, -300, -400, and -400D Series Airplanes |
| aircraft | The Boeing Company | 747-300 Series | Airworthiness Directives; BOEING Model 747-200B, -200C, -300, -400, and -400D Series Airplanes |
| aircraft | The Boeing Company | 747-400 Series | Airworthiness Directives; BOEING Model 747-200B, -200C, -300, -400, and -400D Series Airplanes |
| aircraft | The Boeing Company | 747-400D Series | Airworthiness Directives; BOEING Model 747-200B, -200C, -300, -400, and -400D Series Airplanes |
Unsafe Condition
Passenger oxygen system reservoir bags may become overpressurized and split at the seams, resulting in failure of the bags and inability to deliver unrestricted emergency oxygen through the reservoir mask assemblies.
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Required Actions
Revise the FAA-approved maintenance program to require unrestricted opening of the passenger service unit (PSU) door during functional testing of the passenger oxygen system. Perform a one-time visual inspection to detect leaks in the reservoir bags, and mark and replace any damaged mask assemblies as specified.
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Compliance Time
Within 45 days after the effective date of this AD for maintenance program revision. For inspections: within 15 months for 747-200B, -200C, and -300 series; within 180 days for 747-400 and -400D series, both after the effective date.
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Affected Aircraft
Boeing Model 747-200B, -200C, -300, -400, and -400D series airplanes equipped with passenger oxygen system reservoir mask assemblies (Boeing part numbers 10-60137-152 through -165 inclusive).
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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