AD 98-06-15
Unsafe Condition
Too high pressure in the hydraulic return system during the selection of subsystem(s), which could result in inadvertent braking and/or blown tires.
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Required Actions
Replace the return filter diaphragm assemblies on hydraulic systems 1 and 2 with modified filter units having new diaphragms as specified in Fokker Service Bulletin SBF100-29-025.
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Compliance Time
Required as indicated, unless accomplished previously.
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Affected Aircraft
Fokker Model F28 Mark 0100 series airplanes equipped with Aircraft Porous Media Europe (APME) Limited hydraulic return filter assemblies having part numbers QA07236 and QA07237, all serial numbers.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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