85-02-06: AN/NAS Standard Bolts

85-02-06 BELL HELICOPTER TEXTRON, INC.: Amendment 39-4988. Applies to Model 47G-2A, G-2A-1, G-3, G-3B, G-3B-1, G-3B-2, G-3B-2A, G-4, G-4A, G-5, G-5A, J, J-2, J-2A, and K helicopters with 37-foot diameter main rotor systems and hydraulic boost in longitudinal and lateral cyclic flight control systems, certificated in all categories. (Airworthiness Docket No. 83-ASW-47.) Compliance is required within the next 100 hours time in service after the effective date of this AD. To prevent critical flight control failure in the main rotor system, accomplish the following: (a) Inspect for and remove any incorrect AN/NAS standard bolts installed between hydraulic servo and swashplate control plate, Part Number (P/N) 47-150-184-7, which are not listed in the applicable and current illustrated parts breakdown manual. For removal of incorrect AN/NAS standard bolts, utilize the applicable maintenance and overhaul instructions. (b) Install, torque, and safety, required BellHelicopter Textron, Inc., standard bolts, utilizing applicable and current maintenance and overhaul instructions and illustrated parts breakdown manual. (c) Inspect flight control system for safety and security. (d) Any equivalent method of compliance with this AD must be approved by the Manager, Helicopter Certification Branch, Federal Aviation Administration, 4400 Blue Mound Road, Fort Worth, Texas 76106. (e) Special flight permits may be issued in accordance with FAR Sections 21.197 and 21.199 to fly the aircraft to a base where the requirements of this AD may be accomplished. (Bell Helicopter Alert Service Bulletin No. 47-83-8 pertains to this subject.) This amendment becomes effective February 6, 1985.