Airworthiness directives › 98-06-06
AD 98-06-06 Airworthiness Directives; GKN Westland Helicopters Ltd., 30 Series Helicopters
Applicability*9
Westland 30 Series Helicopters, 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 aircraft from the applicability of this AD.
Compliance
Required as indicated, unless previously accomplished. To prevent failure of the tail rotor drive shaft (drive shaft) coupling attachment flanges that could lead to loss of tail rotor drive and subsequent loss of control of the helicopter, accomplish the following: (a) Within 7 calendar days after the effective date of this AD: (1) Determine from the helicopter records the total hours time- in-service (TIS) for drive shaft number (No.) 1, 2, 3, 4, 5, and 6. (2) Create a component history card or an equivalent record for each drive shaft in accordance with paragraph 2.A.(2) of GKN Westland Helicopters Ltd. Service Bulletin No. W30-65-48, dated November 29, 1995. (b) Before further flight and at intervals not to exceed 3 hours TIS thereafter, inspect the drive shaft attachment flanges for cracks in accordance with paragraph 2.B.(3) of the Accomplishment Instructions of GKN Westland Helicopters, Ltd. Service Bulletin (SB) W30-65-48, dated November 29, 1995, as follows: (1) Drive shaft No. 1, 2, 3, 4, or 5 that has exceeded 1,000 hours TIS; (2) Drive shaft No. 6 that has exceeded 500 hours TIS; and (3) Any drive shaft identified by serial number or flange serial number in Annex A to GKN Westland Helicopter, Ltd. SB W30-65-48, dated November 8, 1996, that has exceeded 500 hours TIS. [[Page 12609]] No more than 10 repetitive inspections are permitted for any affected drive shaft. (c) If a crack is found as a result of the inspections required by paragraph (b) of this AD, before further flight, replace the drive shaft with an airworthy drive shaft. (d) Before further flight, or after 10 repetitive inspections have been accomplished, replace with an airworthy drive shaft any drive shaft that has reached or exceeded the applicable TIS stated in paragraph (b) 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, 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 Standards Staff, Rotorcraft Directorate. Note 2: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Rotorcraft Standards Staff. (f) Special flight permits will not be issued. (g) The inspection shall be done in accordance with GKN Westland Helicopters Ltd. Service Bulletin No. W30-65-48, dated November 29, 1995, and Annex A, dated November 8, 1996. 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 GKN Westland Helicopters Ltd., Customer Support Division, Yeovil, Somerset BA20 2YB, England, telephone (01935) 703884, fax (10935) 703905. Copies may be inspected at the FAA, Office of 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 March 31, 1998. Note 3: The subject of this AD is addressed in Civil Aviation Authority (United Kingdom) AD 013-11-95, dated January 31, 1996. Issued in Fort Worth, Texas, on March 4, 1998. Eric Bries, Acting Manager, Rotorcraft Directorate, Aircraft Certification Service. [FR Doc. 98-6450 Filed 3-13-98; 8:45 am] BILLING CODE 4910-13-U
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