AD 93-05-18
Unsafe Condition
Jamming of the servo and inability to reposition the stabilizer after an uncommanded trim movement due to moisture in the end-cap of the horizontal stabilizer dual actuator servo valve manifold.
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Required Actions
Inspect the end-cap for moisture within 400 hours time-in-service after the AD's effective date (or within the last 1,600 hours if previously done), remove any detected moisture, and modify the end-cap within 2,000 hours time-in-service or one year after the AD's effective date, whichever comes first, per specified service bulletins. Alternative methods may be approved by the FAA.
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Compliance Time
Within 400 hours time-in-service after the effective date of this AD, unless accomplished previously within the last 1,600 hours time-in-service for the inspection; and within 2,000 hours time-in-service or one year after the effective date for the modification, whichever occurs first.
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Affected Aircraft
FOKKER Model F28 Mark 0100 airplanes, serial numbers 11244 through 11356, inclusive.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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