AD 2007-04-27 Airworthiness Directives; Fokker Model F.28 Mark 1000, 2000, 3000, and 4000 Airplanes

Models named: F.28 Mark 1000, 2000, 3000, 4000. Read the applicability below — it usually turns on serial or part numbers too.

This AD applies to all Fokker Model F.28 Mark 1000, 2000, 3000, and 4000 airplanes, certificated in any category.

You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done. Determination of the Part Number (P/N) of the MLG Downlock Actuators (f) Within 66 months after the effective date of this AD: Inspect the left- and right-hand MLG downlock actuators to determine if P/N 200497005 or 200498005 is installed. A review of airplane maintenance records is acceptable in lieu of this inspection if the part number of the MLG downlock actuator can be conclusively determined from that review. If an MLG downlock actuator does not have a subject part number, no further action is required by this AD for that MLG only, except as provided by paragraph (h) of this AD. Replacement of Subject MLG Downlock Actuators (g) For any MLG downlock actuator identified during the inspection or maintenance records review required by paragraph (f) of this AD, or for which the part number cannot be determined: Within 66 months after the effective date of this AD, replace the MLG downlock actuator with a modified MLG downlock actuator in accordance with the Accomplishment Instructions of Fokker Service Bulletin F28/32-163, dated March 8, 2004. Note 1: Fokker Service Bulletin F28/32-163 refers to Dowty Aerospace Hydraulics—Cheltenham Service Bulletin 32-501R, Revision 1, dated September 3, 1998, as an additional source of service information for modifying the MLG downlock actuator. Parts Installation (h) As of the effective date of this AD, no person may install an MLG downlock actuator, P/N 200497005 or 200498005, on any airplane. Alternative Methods of Compliance (AMOCs) (i)(1) The Manager, International Branch, ANM-116, Transport Airplane Directorate, FAA, has the authority to approve AMOCs for this AD, if requested in accordance with the procedures found in 14 CFR 39.19. (2) Before using any AMOC approved in accordance with Sec. 39.19 on any airplane to which the AMOC applies, notify the appropriate principal inspector in the FAA Flight Standards Certificate Holding District Office. Related Information (j) Dutch airworthiness directive 2004-047, dated April 20, 2004, also addresses the subject of this AD. Material Incorporated by Reference (k) You must use Fokker Service Bulletin F28/32-163, dated March 8, 2004, to perform the actions that are required by this AD, unless the AD specifies otherwise. The Director of the Federal Register approved the incorporation by reference of this document in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Contact Fokker Services B.V., Technical Services Dept., P.O. Box 231, 2150 AE Nieuw-Vennep, the Netherlands, for a copy of this service information. You may review copies at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or 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/cfr/ibr-locations.html. Issued in Renton, Washington, on February 15, 2007. Stephen Boyd, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. E7-3168 Filed 2-26-07; 8:45 am] BILLING CODE 4910-13-P

This AD results from a report of a failed downlock actuator, which resulted in the left main landing gear (MLG) collapsing during taxi after landing. We are issuing this AD to prevent failure of the downlock actuator, which could prevent the MLG side stay from locking properly, resulting in collapse of the MLG during ground maneuvers or upon landing.