AD 90-11-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-200B Series | Airworthiness Directives; BOEING Model 747-200 and 747-300 Series Airplanes |
| aircraft | The Boeing Company | 747-200C Series | Airworthiness Directives; BOEING Model 747-200 and 747-300 Series Airplanes |
| aircraft | The Boeing Company | 747-200F Series | Airworthiness Directives; BOEING Model 747-200 and 747-300 Series Airplanes |
| aircraft | The Boeing Company | 747-300 Series | Airworthiness Directives; BOEING Model 747-200 and 747-300 Series Airplanes |
Unsafe Condition
Fuel leakage or fuel staining at the forward side of the forward wall of the center wing fuel tank between fuselage stringers S-37 and S-39 could allow fuel or fuel vapors to enter the forward cargo compartment.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Conduct a visual inspection for fuel leaks at specified locations within 50 flight hours after the effective date, with recurring inspections every 400 flight hours. If leakage or staining is found, perform drag splice fitting modifications with Inconel 718 bolts and reseal the fitting within 36 months. Inspect and repair the center wing fuel tank's secondary fuel barrier within 36 months and submit findings within 30 days. Alternate compliance may be approved by the FAA.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 50 flight hours after the effective date of this AD, unless previously accomplished within the last 350 flight hours, and thereafter at intervals not to exceed 400 flight hours
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Boeing Model 747-200 and 747-300 series airplanes listed in Boeing Alert Service Bulletin 747-57A2247, Revision 3, dated June 22, 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
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.