AD 99-21-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | A330-301 | Airworthiness Directives; Airbus Model A330-301, and Model A340-211, -212, -311, and -312 Series Airplanes |
| aircraft | Airbus | A340-211 | Airworthiness Directives; Airbus Model A330-301, and Model A340-211, -212, -311, and -312 Series Airplanes |
| aircraft | Airbus | A340-212 | Airworthiness Directives; Airbus Model A330-301, and Model A340-211, -212, -311, and -312 Series Airplanes |
| aircraft | Airbus | A340-311 | Airworthiness Directives; Airbus Model A330-301, and Model A340-211, -212, -311, and -312 Series Airplanes |
| aircraft | Airbus | A340-312 | Airworthiness Directives; Airbus Model A330-301, and Model A340-211, -212, -311, and -312 Series Airplanes |
Unsafe Condition
Fatigue cracking of the fuselage belly fairing support structure could result in reduced structural integrity.
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Required Actions
Perform a detailed visual inspection of the fuselage belly fairing support structure for cracks within 500 flight hours after the effective date or before 4,000 total flight cycles, whichever is later. Repeat inspections every 2,800 flight cycles. Repair cracks prior to further flight using specified service bulletins. Optional modification per service bulletins terminates inspections.
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Compliance Time
Within 500 flight hours after November 5, 1999, or before accumulating 4,000 total flight cycles, whichever occurs later
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Affected Aircraft
Airbus Model A330-301 and A340-211, -212, -311, -312 series airplanes except those with Modifications 42331/42332 or equivalent service bulletins accomplished.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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