Airworthiness Directive · Amendment 39-14376 · Fokker Model F27 Mark 050 Airplanes
Fokker Model F27 Mark 050 Airplanes
This AD applies to all Fokker Model F27 Mark 050 airplanes, certificated in any category.
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 consequent fire.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
At the applicable compliance time specified in paragraph (f)(1) or (f)(2) of this AD, do a general visual inspection of the bleed air supply to determine if blanking plugs are present and a general visual inspection of the entire area of the engine nacelle for any heat damage, and do any corrective actions as applicable, by accomplishing all of the applicable actions specified in parts B and C of the Accomplishment Instructions of Fokker Service Bulletin SBF50-36-006, dated October 1, 2001; except as provided by paragraph (g) of this AD. Any corrective actions must be done before further flight.
Note 1: For the purposes of this AD, a general visual inspection is: “A visual examination of an interior or exterior area, installation, or assembly to detect obvious damage, failure, or irregularity. This level of inspection is made from within touching distance unless otherwise specified. A mirror may be necessary to ensure visual access to all surfaces in the inspection area. This level of inspection is made under normally available lighting conditions such as daylight, hangar lighting, flashlight, or droplight and may require removal or opening of access panels or doors. Stands, ladders, or platforms may be required to gain proximity to the area being checked.” (1) For airplanes that have accumulated 20,000 total flight hours or more as of the effective date of this AD: Within 6 months after the effective date of this AD. (2) For airplanes that have accumulated less than 20,000 total flight hours as of the effective date of this AD: Within 12 months after the effective date of this AD.
(g) If, during accomplishment of the corrective actions required by paragraph (f) of this AD, the service bulletin requires contacting the manufacturer for instructions on repairing heat damage to a component, wiring, or structure: Before further flight, repair according to a method approved by either the Manager, International Branch, ANM-116, FAA, Transport Airplane Directorate; or the Civil Aviation Authority—The Netherlands (or its delegated agent).
Before further flight after accomplishing the inspection required by paragraph (f) of this AD: Replace the blanking plugs of the bleed air supply ducts with clamping devices, in accordance with Part D of the Accomplishment Instructions of Fokker Service Bulletin SBF50-36-006, dated October 1, 2001.
