Airworthiness Directives; Fokker Model F28 Mark 0100 Series Airplanes

This amendment adopts a new airworthiness directive (AD), applicable to certain Fokker Model F28 Mark 0100 series airplanes, that requires replacement of the return filter diaphragm assemblies on hydraulic systems 1 and 2 with modified filter units having new diaphragms. This amendment is prompted by a report of insufficient running clearance of the brake units due to overpressure in the hydraulic return system; this condition could lead to brake overheating. The actions specified by this AD are intended to prevent too high pressure in the hydraulic return system during the selection of subsystem(s), which could result in inadvertent braking and/or blown tires.