AD 98-14-01 Airworthiness Directives; Eurocopter France Model AS-350B, BA, B1, B2, and D, and Model AS-355E, F, F1, F2, and N Helicopters

Models named: AS-350B, BA, B1, B2, D, Model AS- 355E, F, F1, F2, N. Read the applicability below — it usually turns on serial or part numbers too.

Model AS-350B, BA, B1, B2, and D, and Model AS- 355E, F, F1, F2, and N helicopters, with main gearbox suspension bi- directional cross-beam (cross-beam), part number (P/N) 350A38-1018- all dash numbers, installed, certificated in any category. Note 1: This AD applies to each helicopter identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For helicopters that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must use the authority provided in paragraph (e) to request approval from the FAA. This approval may address either no action, if the current configuration eliminates the unsafe condition, or different actions necessary to address the unsafe condition described in this AD. Such a request should include an assessment of the effect of the changed configuration on the unsafe condition addressed by this AD. In no case does the presence of any modification, alteration, or repair remove any helicopter from the applicability of this AD.

Required as indicated, unless accomplished previously. To prevent failure of the cross-beam that could lead to rotation of the main gearbox, resulting in severe vibrations and a subsequent forced landing, accomplish the following: (a) For cross-beams having 2,000 or more hours time-in-service (TIS) or 10,000 or more operating cycles: Note 2: The Master Service Recommendations and the flight log contain accepted procedures that are used to determine the cumulative operating cycles on the rotorcraft. (1) Within 30 hours TIS, and thereafter at intervals not to exceed 30 hours TIS or 150 operating cycles, visually inspect the cross-beam for cracks in accordance with paragraph 2.B.1) of Eurocopter France Service Bulletin No. 05.00.28, applicable to Model AS-350 helicopters, or Eurocopter France Service Bulletin No. 05.00.29, applicable to Model AS-355 helicopters, both dated May 26, 1997. (2) If a crack is found as a result of the inspections required by paragraph (a)(1) of this AD, remove the cross-beam and replace it with an airworthy cross-beam. (b) For cross-beams having 5,000 or more hours TIS: (1) Within 550 hours TIS or 2,750 operating cycles, whichever occurs first, after compliance with paragraph (a)(1) of this AD, perform a dye-penetrant inspection in accordance with paragraph 2.B.2) of Eurocopter France Service Bulletin No. 05.00.28, applicable to Model AS-350 helicopters, or Eurocopter Service Bulletin No. 05.00.29, applicable to Model AS-355 helicopters, both dated May 26, 1996. (2) If a crack is found as a result of the inspections required by paragraphs (b)(1) of this AD, remove the cross-beam and replace it with an airworthy cross-beam. (c) Prior to installing any replacement cross-beams, regardless of TIS, inspect the replacement cross-beam in accordance with paragraph (b)(1) of this AD. (d) Accomplishment of the modifications in accordance with paragraph 2.B of the Accomplishment Instructions in Eurocopter Service Bulletin No. 63.00.07, applicable to Model AS-350B, BA, B1, B2, and D helicopters, or Eurocopter Service Bulletin No. 63.00.13, applicable to Model AS-355E, F, F1, F2, and N helicopters, both dated April 7, 1997, constitutes terminating action for the requirements of this AD. (e) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Rotorcraft Standards Staff, FAA, Rotorcraft Directorate. Operators shall submit their requests through an FAA Principal Maintenance Inspector, who may concur or comment and then send it to the Manager, Rotorcraft Certification Office. Note 3: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Rotorcraft Certification Office. (f) Special flight permits may be issued in accordance with Secs. 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the helicopter to a location where the requirements of this AD can be accomplished. (g) The inspections and replacements, if necessary, shall be done in accordance with Eurocopter France Service Bulletin No. 05.00.28, applicable to Model AS-350 helicopters, and Eurocopter France Service Bulletin No. 05.00.29, applicable to Model AS-355 helicopters, both dated May 26, 1997. 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 American Eurocopter Corporation, 2701 Forum Drive, Grand Prairie, Texas 75053-4005, telephone (972) 641-3460, fax (972) 641-3527. Copies may be inspected at the FAA, Office of the Regional Counsel, Southwest Region, 2601 Meacham Blvd., Room 663, Fort Worth, Texas; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (h) This amendment becomes effective on August 3, 1998. Note 4: The subject of this AD is addressed in Direction Generale De L'Aviation Civile (France) AD 96-156-071(B)R1 and AD 96- 155-053(B)R1, both dated June 4, 1997. Issued in Fort Worth, Texas, on June 19, 1998. Eric Bries, Acting Manager, Rotorcraft Directorate, Aircraft Certification Service. [FR Doc. 98-17178 Filed 6-26-98; 8:45 am] BILLING CODE 4910-13-P