AD NUMBER: 2005-23-18
SUBJECT: Airworthiness Directive 2005-23-18 SUMMARY: The FAA is
adopting a new airworthiness directive (AD) for all Fokker Model
F27 Mark 050 airplanes.
This AD requires a one-time inspection of the bleed air supply
ducts to determine if blanking plugs are present and a one-time
inspection of the entire area of the engine nacelle for heat
damage; and corrective actions if necessary. This AD also requires
replacement of the blanking plugs with clamping devices.
This AD results from heat damage in areas adjacent to the bleed
air supply duct assembly.
We are issuing this AD to prevent rupture of the bleed air
supply duct, which could lead to hot bleed air leaking into the
engine controls area and result in heat damage to control cables,
electrical wiring, hydraulic components, and fuel lines, and