AD 99-10-16
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Mitsubishi Heavy Industries, Ltd. | YS-11 | Airworthiness Directives; Mitsubishi Model YS-11 Series Airplanes |
Unsafe Condition
Fatigue cracking in the manhole doublers of the lower wing panels could result in failure of the wing structure.
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Required Actions
Conduct repetitive inspections at 6,000 flight cycles intervals to detect fatigue cracking in the manhole doublers; repair if necessary. Modify screw holes in the manhole doublers as specified in Mitsubishi NAMC Service Bulletin 57-77, Revision 2, which terminates the repetitive inspection requirement.
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Compliance Time
Before further flight
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Affected Aircraft
Mitsubishi Model YS-11 series airplanes
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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