AD 90-13-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-100 Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-100B Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-100B SUD Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200B Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200C Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200F Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-300 Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400 Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400D Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400F Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
Unsafe Condition
Failure of the bleed relief valves to maintain sufficient oxygen pressure during emergency conditions could result in insufficient oxygen supply to supernumeraries.
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Required Actions
Revise the AFM Limitations Section to limit supernumeraries to 16 people within 10 days after the effective date. Replace bleed relief valves with higher operating pressure valves within 3,000 hours time-in-service using Boeing Service Bulletin 747-35A2061. After valve replacement, remove the AFM limitation.
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Compliance Time
Within the next 10 days after the effective date of this AD and within the next 3,000 hours time-in-service after the effective date of this AD
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Affected Aircraft
Boeing Model 747 series airplanes listed in Boeing Alert Service Bulletin 747-35A2061 dated October 19, 1989.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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