AD 2003-10-04 Airworthiness Directives; Dassault Model Mystere-Falcon 50 Series Airplanes

Models named: Mystere-Falcon 50 series. Read the applicability below — it usually turns on serial or part numbers too.

Model Mystere-Falcon 50 series airplanes having serial numbers 2 through 329 inclusive, certificated in any category.

Required as indicated, unless accomplished previously. To prevent chafing and consequent leakage of the hydraulic lines located within the No. 1 and No. 3 engine pylons, which can result in failure of the No. 1 and No. 2 hydraulic systems, and consequent reduced controllability of the airplane, accomplish the following: Service Information (a) The following information pertains to the service bulletin referenced in this AD: (1) The term “service bulletin,” as used in this AD, means the Accomplishment Instructions of Dassault Service Bulletin F50-A370, dated May 6, 2003. (2) Although the service bulletin referenced in this AD specifies to submit inspection results to the manufacturer, this AD does not include such a requirement. Inspection (b) Within 7 days after the effective date of this AD, do a detailed inspection of the entire length of the hydraulic lines located within the No. 1 and No. 3 engine pylons for clearance, per paragraph 2.C.(2)(b) of the service bulletin. Note 1: For the purposes of this AD, a detailed inspection is defined as: “An intensive visual examination of a specific structural area, system, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at intensity deemed appropriate by the inspector. Inspection aids such as mirror, magnifying lenses, etc., may be used. Surface cleaning and elaborate access procedures may be required.” Proper Clearance (c) If the clearance of both hydraulic lines is found within the limits specified in the service bulletin during the inspection required by paragraph (b) of this AD, do the actions specified in paragraph (e) of this AD. Incorrect Clearance (d) If the clearance of any hydraulic line is found outside the limits specified in the service bulletin during the inspection required by paragraph (b) of this AD, before further flight, do a detailed inspection for discrepancies ( i.e. , evidence of contact, chafing, or abrasion) between the hydraulic lines, per the service bulletin. (1) If no discrepancy is detected, do the actions specified in paragraph (e) of this AD. (2) If any discrepancy is detected, before further flight, measure the wear depth per the service bulletin. (i) If the measurement is less than 0.004-inch (0.10 millimeter (mm)), no further action is required by this paragraph. (ii) If the measurement is greater than or equal to 0.004-inch (0.10 mm), at the applicable time specifed in Figure 1, 2, or 3 of the service bulletin following the inspection required by paragraph (d) of this AD, replace the hydraulic line with a new hydraulic line per the service bulletin. The term “flights,” as used in Figures 1, 2, and 3 of the service bulletin, means “flight cycles” for this AD. Fastening Lines, Ensuring Proper Clearance, and Marking Location of Clamps (e) Before further flight following any inspection or replacement required by this AD, do the actions specified in paragraphs (e)(1), (e)(2), and (e)(3) of this AD per the service bulletin. (1) Using clamps, screws, and nuts, fasten the hydraulic line(s) as indicated in Figure 4 of the service bulletin. (2) Ensure proper clearance between the hydraulic line(s) and adjacent structure as indicated in paragraph 2.C.(2)(b) of the service bulletin. (3) Using yellow paint, mark the location of the clamps installed on the hydraulic line(s). Revision to Maintenance Manual (f) Within 7 days after the effective date of this AD, revise the Dassault Falcon 50 Maintenance Manual by inserting a copy of Dassault Falcon 50 Maintenance Manual Temporary Revision 37, dated May 2003. Alternative Methods of Compliance (g) In accordance with 14 CFR 39.19, the Manager, International Branch, ANM-116, Transport Airplane Directorate, FAA, is authorized to approve alternative methods of compliance for this AD. Incorporation by Reference (h) The actions shall be done per Dassault Service Bulletin F50-A370, dated May 6, 2003; and Dassault Falcon 50 Maintenance Manual Temporary Revision 37, dated May 2003; as applicable. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from Dassault Falcon Jet, PO Box 2000, South Hackensack, New Jersey 07606. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. Note 2: The subject of this AD is addressed in French telegraphic airworthiness directive T2003-190(B), dated May 6, 2003. Effective Date (i) This amendment becomes effective on June 4, 2003. Issued in Renton, Washington, on May 9, 2003. Vi L. Lipski, Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 03-12110 Filed 5-19-03; 8:45 am] BILLING CODE 4910-13-P