88-12-09: Main Rotor Shaft

88-12-09 BOEING HELICOPTER COMPANY (BOEING VERTOL; VERTOL) AND KAWASAKI HEAVY INDUSTRIES, LTD: Amendment 39-5919. Applies to Boeing Helicopter Company Model 107-II and Kawasaki Model KV107- IIA helicopters, certificated in any category (Airworthiness Docket 88-ASW-10). Compliance is required as indicated, unless already accomplished. To prevent possible hazards in flight associated with a cracked aft main rotor shaft slider guide, Part Number (P/N) 107R3574-1, accomplish the following: (a) Within the next 10 hours time in service from the effective date of this AD, or before the accumulation of 1,200 hours time in service, whichever comes later, perform a dye penetrant inspection of the two forward lug areas of the aft main rotor shaft slider guide for cracks in accordance with paragraph 2, "Accomplishment Instructions," Boeing Helicopter Co., Service Bulletin No. 107-370R1, dated September 21, 1987. (b) After the initial inspection of paragraph (a), repeat the dye penetrant inspection at intervals not to exceed 50 hours time in service from the last inspection. (c) Remove cracked slider guides from service and replace with a serviceable part prior to further flight. (d) Upon submission of substantiating data by an owner or operator through an FAA maintenance inspector, the Manager, New York Aircraft Certification Office, FAA, New England Region, may adjust the compliance times specified in this AD. (e) An alternate method of compliance which provides an equivalent level of safety may be used when approved by the Manager, New York Aircraft Certification Office, 181 South Franklin Avenue, Valley Stream, New York 11581. (f) In accordance with FAR sections 21.197, and 21.199, flight is permitted to a base where the requirements of this AD may be accomplished. The procedures shall be done in accordance with paragraph 2, "Accomplishment Instructions," Boeing Helicopter Co., Service Bulletin No. 107-370R1, dated September 21, 1987. 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 Boeing Helicopter Company, Boeing Center, P.O. Box 16858, Philadelphia, Pennsylvania 19141. These documents may be examined at the Office of the Regional Counsel, FAA, Southwest Region, 4400 Blue Mound Road, Fort Worth, Texas, or the Office of the Federal Register, 1100 L Street, N.W., Room 8401, Washington, D.C. This amendment, 39-5919, becomes effective June 2, 1988.