Airworthiness Directive · Amendment 39-15372 · Fuselage
Fokker Model F.27 Mark 050 Airplanes
This AD applies to Fokker Model F.27 Mark 050 airplanes, certificated in any category; serial numbers 20103 through 20172 inclusive.
We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:
Unless already done, do the following actions.
(1) Before the accumulation of 20,000 total flight cycles, or within 3 weeks after the effective date of this AD, whichever occurs later, perform a detailed visual inspection for cracks of the fuselage bottom skin chine line between fuselage station (STA) 6675 and STA 15375 in accordance with Part 3, Steps A. and B., of the Accomplishment Instructions of Fokker Service Bulletin SBF50-53-058, dated June 30, 2006. If any crack is found appearing through the paint layer, before further flight, remove the paint to determine the extent of the cracking and repair in accordance with the instructions in the service bulletin.
(2) Before the accumulation of 45,000 total flight cycles, or within 3 weeks after the effective date of this AD, whichever occurs later, perform a detailed visual inspection for cracks of the fuselage bottom skin chine line between STA 1320 and STA 3100 in accordance with Part 3, Steps C. and D., of the Accomplishment Instructions of Fokker Service Bulletin SBF50-53-058, dated June 30, 2006. If any crack is found appearing through the paint layer, before further flight remove the paint to determine the extent of the cracking and repair in accordance with the instructions in the service bulletin.
(3) In all cases, whether or not cracks were found and repaired in accordance with the requirements in paragraphs (f)(1) and (f)(2) of this AD: Within 1,000 flight cycles after the visual inspections required by paragraphs (f)(1) and (f)(2) of this AD or within 1,000 flight cycles after the effective date of this AD, whichever occurs later, do an eddy current inspection of the fuselage bottom skin chine line (between the same fuselage stations as covered by the visual inspection) in accordance with Part 3 of the Accomplishment Instructions of Fokker Service Bulletin SBF50-53-059, dated August 24, 2006. If any crack is found during any eddy-current inspection, repair before further flight in accordance with the instructions in the service bulletin.
(4) If any crack is found as a result of any inspection requirement of this directive, within 30 days after the inspection or 30 days after the effective date of this AD, whichever occurs later, report all findings to the Type Certificate holder at the following address: Fokker Services B.V., Technical Services Dept., P.O. Box 231, 2150 AE Nieuw-Vennep, the Netherlands.
Note: This AD differs from the MCAI and/or service information as follows: Although the MCAI or service information allows flight with cracks of different lengths on the fuselage bottom skin chine line between certain fuselage stations, this AD requires accomplishing the applicable repair before further flight if any crack is found.
