# AD 85-02-06: AN/NAS Standard Bolts - Type: Airworthiness directive - Status: Current - Products: Scotts-Bell 47 47G-2A, 47G-2A-1, 47G-3, 47G-3B, 47G-3B-1, 47G-3B-2, 47G-3B-2A, 47G-4, 47G-4A, 47G-5, 47G-5A, 47J and 3 more - Effective: February 6, 1985 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Rotorcraft - Amendment: 39-4988 - Registered aircraft: 278 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/595D413A7CE0AFA786256A4E004FF7D8.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/85-02-06 ## The airworthiness directive 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. ## Affected data sheets (2) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS 2H3](https://openairdocs.org/tcds/2H3): Scott's-Bell 47 Inc; names 11 of 11 models: 47G-2A, 47G-3B, 47G-3, 47G-4A, 47G-5A, 47G-5, 47G-3B-2A, 47G-3B-2… - [TCDS 2H1](https://openairdocs.org/tcds/2H1): Scott's-Bell 47 Inc; names 4 of 4 models: 47K, 47J-2, 47J-2A, 47J ## Registered aircraft it may apply to (OpenAirDocs) Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment. - Aircraft: 278 (278 by airframe model, 0 by engine model) - Makers: Bell 276, Bell-Huddleston And Wilson 1, Bell-Intermountain 1 Models with the most aircraft: - [Bell 47G-3B-1](https://openairdocs.org/model/bell-47g-3b-1): 86 aircraft (airframe model) - [Bell 47G-5](https://openairdocs.org/model/bell-47g-5): 40 aircraft (airframe model) - [Bell 47G-3B-2](https://openairdocs.org/model/bell-47g-3b-2): 26 aircraft (airframe model) - [Bell 47G-4A](https://openairdocs.org/model/bell-47g-4a): 20 aircraft (airframe model) - [Bell 47G-2A](https://openairdocs.org/model/bell-47g-2a): 19 aircraft (airframe model) - [Bell 47G-5A](https://openairdocs.org/model/bell-47g-5a): 19 aircraft (airframe model) - [Bell 47G-3B](https://openairdocs.org/model/bell-47g-3b): 15 aircraft (airframe model) - [Bell 47G-2A-1](https://openairdocs.org/model/bell-47g-2a-1): 13 aircraft (airframe model) - [Bell 47G-4](https://openairdocs.org/model/bell-47g-4): 13 aircraft (airframe model) - [Bell 47G3B2A](https://openairdocs.org/model/bell-47g3b2a): 7 aircraft (airframe model) - [Bell 47J](https://openairdocs.org/model/bell-47j): 6 aircraft (airframe model) - [Bell 47J-2](https://openairdocs.org/model/bell-47j-2): 6 aircraft (airframe model) - [Bell 47J-2A](https://openairdocs.org/model/bell-47j-2a): 5 aircraft (airframe model) - [Bell-Intermountain 47G-3B-1](https://openairdocs.org/model/bell-intermountain-47g-3b-1): 1 aircraft (airframe model) - [Bell-Huddleston And Wilson 47G-3B1](https://openairdocs.org/model/bell-huddleston-and-wilson-47g-3b1): 1 aircraft (airframe model) - [Bell 47K](https://openairdocs.org/model/bell-47k): 1 aircraft (airframe model) All 18 models: https://openairdocs.org/ad/85-02-06/models.md Every aircraft: https://openairdocs.org/ad/85-02-06/aircraft.md Its text cites no advisory circulars or STCs. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.