AD 99-21-33
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Fokker Services | F27 Mark 050 | Airworthiness Directives; Fokker Model F.27 Mark 050 Series Airplanes |
Unsafe Condition
Improper installation of countersunk screws in the attachment of access panels to the bottom skin of the center wing could result in fatigue cracking of the bottom skin and consequent reduced structural integrity of the airplane.
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Required Actions
Perform a one-time detailed visual inspection to detect improper installation (excessive gap) of the countersunk screws. If improper installation is found, ream the fastener holes and perform an eddy current inspection to detect cracks in the bottom skin. Repair any detected cracks in accordance with FAA-approved methods.
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Compliance Time
Before further flight if the inspection is not accomplished prior to 24,000 total flight cycles.
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Affected Aircraft
Fokker Model F.27 Mark 050 series airplanes, serial numbers 20103 through 20263 inclusive.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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