AD 2009-02-10

(a) This airworthiness directive (AD) becomes effective April 2, 2009.

(b) This AD supersedes AD 2008-04-22, Amendment 39-15394.

(c) This AD applies to Fokker Model F.28 Mark 0070 and 0100 airplanes, certificated in any category.

(d) Air Transport Association (ATA) of America Code 53: Fuselage.

(e) The mandatory continuing airworthiness information (MCAI) states:

Several reports have been received about roll control problems due to frozen moisture on the aileron pulleys that are located in the LH [left-hand] and RH [right-hand] Main Landing Gear (MLG) wheel bays on the centre wing rear spar, under the wing to fuselage fairings. Investigation revealed that improper sealing of the aerodynamic seals of the Wing-to-Fuselage Fairings can cause rain-or washwater and de-icing fluids to leak onto the affected aileron pulleys. Exposure of the aileron pulleys to the leaked moisture in freezing condition can result in restricted aileron control movement (partly jammed) and/or higher control forces. This condition, if not corrected, could lead to partial loss of control of the aircraft. To address this unsafe condition, Fokker Services originally introduced SBF100-53-101 which was made mandatory through CAA Netherlands (CAA-NL) AD NL-2005-013 [which corresponds to FAA AD 2008-04-22] with a compliance time of 12 months after November 1, 2005.

Following this, new reports of problems due to freezing moisture in the same area have been received. This has prompted Fokker Services to publish SBF100-53-107, which introduces an additional one-time inspection [for deviations] of the aerodynamic seals of the Wing-to-Fuselage Fairings and the application of an improved sealing of the aerodynamic seal by means of a fillet seam between the upper left and right fairings and the fuselage skin.

For the reasons described above, this EASA AD supersedes CAA-NL AD NL-2005-013 and requires an additional one-time inspection [for deviations] and application of improved sealing.

This action retains the inspection in AD 2008-04-22. Doing the additional inspection terminates the requirement to do the inspection required by the existing AD. The additional inspection for deviations includes inspecting for fit between the left-hand and right-hand wing-to-fuselage fairings and the fuselage skin; inspecting for damage to the aerodynamic seal on the fairings; inspecting for fit of the aerodynamic seal to the fuselage; and doing related investigative and corrective actions if necessary. The related investigative actions include inspecting the aerodynamic seal for damage (including wear); inspecting the abrasion resistant coating for damage (including wear); and re-inspecting for fit. The corrective actions include installing a new seal, restoring the protective coating, correcting the position of the fairing, and sealing the gaps between the fairings and the surrounding structure.

(f) Unless already done: Within 12 months after April 3, 2008 (the effective date of AD 2008-04-22), inspect the wing-to-fuselage fairings for indications of incorrect fit, damage, or wear, in accordance with the Accomplishment Instructions of Fokker Service Bulletin SBF100-53-101, dated September 30, 2005 (“the service bulletin”). Doing the inspection required by paragraph (g) of this AD terminates the actions required by this paragraph.

(1) If no indications of incorrect fit, damage, or wear are found, no further action is required by this paragraph.

(2) If any incorrect fit, damage, or wear is found, before next flight, do related investigative actions and applicable corrective actions in accordance with the Accomplishment Instructions of the service bulletin.

(g) Unless already done: Within 12 months after the effective date of this AD, inspect for deviations of the aerodynamic seal of the wing-to-fuselage fairings and the fuselage skin, do all applicable related investigative and corrective actions, and apply a fillet seam between the fairings and the fuselage skin, in accordance with the Accomplishment Instructions of Fokker Service Bulletin SBF100-53-107, dated February 26, 2008. Do all applicable related investigative and corrective actions before further flight. Accomplishment of this inspection terminates the actions required by paragraph (f) of this AD.

Note 1:

This AD differs from the MCAI and/or service information as follows:

No differences.

(h) The following provisions also apply to this AD:

(1) Alternative Methods of Compliance (AMOCs): The Manager, ANM-116, International Branch, Transport Airplane Directorate, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Send information to ATTN: Tom Rodriguez, Aerospace Engineer, International Branch, ANM-116, Transport Airplane Directorate, FAA, 1601 Lind Avenue SW., Renton, Washington 98057-3356; telephone (425) 227-1137; fax (425) 227-1149. Before using any approved AMOC on any airplane to which the AMOC applies, notify your appropriate principal inspector (PI) in the FAA Flight Standards District Office (FSDO), or lacking a PI, your local FSDO.

(2) Airworthy Product: For any requirement in this AD to obtain corrective actions from a manufacturer or other source, use these actions if they are FAA-approved. Corrective actions are considered FAA-approved if they are approved by the State of Design Authority (or their delegated agent). You are required to assure the product is airworthy before it is returned to service.

(3) Reporting Requirements: For any reporting requirement in this AD, under the provisions of the Paperwork Reduction Act, the Office of Management and Budget (OMB) has approved the information collection requirements and has assigned OMB Control Number 2120-0056.

(i) Refer to MCAI European Aviation Safety Agency Airworthiness Directive 2008-0079, dated April 24, 2008; Fokker Service Bulletin SBF100-53-101, dated September 30, 2005; and Fokker Service Bulletin SBF100-53-107, dated February 26, 2008; for related information.

(j) You must use Fokker Service Bulletin SBF100-53-101, dated September 30, 2005; and Fokker Service Bulletin SBF100-53-107, dated February 26, 2008; as applicable; to do the actions required by this AD, unless the AD specifies otherwise.

(1) The Director of the Federal Register approved the incorporation by reference of Fokker Service Bulletin SBF100-53-107, dated February 26, 2008, under 5 U.S.C. 552(a) and 1 CFR part 51.

(2) The Director of the Federal Register previously approved the incorporation by reference of Fokker Service Bulletin SBF100-53-101, dated September 30, 2005, on April 3, 2008 (73 FR 10650, February 28, 2008).

(3) For service information identified in this AD, contact Fokker Services B.V., Technical Services Dept., P.O. Box 231, 2150 AE Nieuw-Vennep, the Netherlands; telephone +31 (0)252-627-350; fax +31 (0)252-627-211; e-mail technicalservices.fokkerservices@stork.com; Internet http://www.myfokkerfleet.com.

(4) You may review copies of the service information that is incorporated by reference at the FAA, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, Washington. For information on the availability of this material at the FAA, call 425-227-1221 or 425-227-1152.

(5) You may also review copies of the service information at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html.