AD 2023-17-14
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Cracking of the front spar lower chord, which in combination with cracking in the front spar web, could result in a fuel leak and fire hazard, or in the case of more severe cracking, could also affect the structural integrity of the airplane. Additionally, errors in the application of fastener cap seals to fasteners penetrating the center wing fuel tank introduce a risk of a fuel tank explosion following a lightning strike.
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Required Actions
Review maintenance records of previously modified airplanes for the procedures used during modification and take applicable corrective actions. Apply a cap seal of the correct sealant type and minimum thickness to fasteners associated with the underwing longeron if not already done. Replace any cap seal previously applied using a procedure that specifies an inadequate thickness. Replace any seal removed for inspections with a cap seal of correct sealant type and adequate thickness. Revise the maintenance manual to reflect the correct cap seal thickness and application procedures.
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Compliance Time
Within 12 months of the effective date of this AD.
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Affected Aircraft
The Boeing Company Model 777 airplanes, excluding Model 777-200 airplanes with a maximum taxi weight of 547,000 pounds or less and Model 777F airplanes having manufacturer line numbers 1743 and subsequent.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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