AD 2021-06-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
operation of an airplane with any inoperative refuel valve (fueling shut-off valve) failed in the open position, which could result in an un-commanded fuel transfer between the main and center fuel tanks, and potentially a fuel exhaustion event.
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Required Actions
prohibit operation of an airplane with any inoperative refuel valve (fueling shut-off valve) failed in the open position, eliminate the relief provided by the dispatch provisions of ATA 28-20 (2), (3), (4), (5), and (6) from the Boeing 747 B-747-100/200/300/SP SERIES MMEL, and revise paragraph (h)(4) of this AD to include MMEL Item 28-21-02-01A, "Refuel Valves," which applies to passenger airplanes.
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Compliance Time
60 days after the effective date of the AD
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Affected Aircraft
all The Boeing Company Model 747 series airplanes and Model 767 series airplanes
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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