AD 91-18-15
Unsafe Condition
Cracks and resultant reduced structural integrity of the vertical stabilizer due to insufficient reinforcement of rib 5.0 flanges.
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Required Actions
Reinforce the flanges of rib 5.0 by installing finger clips per Fokker Service Bulletin F100-55-014. Alternative methods of compliance or adjustments to compliance time may be approved by the FAA's Standardization Branch. Special flight permits under FAR 21.197/21.199 may be issued to operate to a base for AD compliance.
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Compliance Time
Prior to the accumulation of 6,000 landings since new or within 100 days after the effective date of this AD (October 8, 1991), whichever occurs later.
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Affected Aircraft
FOKKER Model F-28 Mark 0100 series airplanes, Serial Numbers 11244 through 11335.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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