AD 2022-16-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Compromised sealant adhesion can, over time, affect the lightning-protection properties of the airplane. This condition, if not addressed and combined with a flammable center tank ullage and an independent failure of the primary lightning protection feature, could result in ignition of the fuel vapors and subsequent explosion in the event of a lightning strike to that fastener.
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Required Actions
Preparation of the affected surface areas to ensure that there is adequate sealant adhesion, and complete encapsulation of the discrepant fastener locations with the approved production sealant. Alternatively, operators may remove the current application of BMS5-45 sealant in the affected areas, remove the black stripe of ink in accordance with acceptable surface preparation procedures, and reseal the fasteners in accordance with standard sealing procedures of fasteners penetrating the fuel tank.
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Compliance Time
Within 50 flight hours
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Affected Aircraft
The Boeing Company Model 737-8 airplanes, with upper wing panel stringers U-S1, U-S10, U-S12, U-S20, and U-S21 and lower wing panel stringer L-S14.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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