# AD 86-06-08 R1: Main Rotor Blade Grips - Type: Airworthiness directive - Status: Historical - Products: Bell Helicopter Textron 47B, 47B3, 47D, 47D1, 47E, 47G, 47G-2, 47G-2A, 47G-2A-1, 47G-3, 47G-3B, 47G-3B-1 and 16 more - Effective: July 10, 1987 - Superseded by: [AD 2000-18-51](https://openairdocs.org/ad/2000-18-51) - Product type: Aircraft, Rotorcraft - Amendment: 39-5626 - Docket: 86-ASW-10 - Registered aircraft: 491 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2A9165A73C031E3F86256A4D0073CC47.0001 - DRS record last changed: August 7, 2025 - Page: https://openairdocs.org/ad/86-06-08-R1 ## The airworthiness directive 86-06-08 R1 BELL HELICOPTER TEXTRON, INC.: TEXAS HELICOPTER CORPORATION: HAWKEYE ROTOR AND WING: TERYJON AVIATION, INC.: CONTINENTAL COPTERS, INC.: Amendment 39-5260 as amended by Amendment 39- 5626. Applies to Model 47 series, U.S. Army Model OH-13E, U.S. Army Model OH-13H, and Model Fast Kat I (U.S. Army Model OH-13S) helicopters certified in any category equipped with main rotor blade grips, BHTI Part Numbers (P/N) 47-120-135-2, 47-120-135-3, 47-120-135-5, and 47-120-252-1; Main Rotor Grip Assembly BHTI P/N's 47-120-252-7 and 47-120-252-11; and Texas Helicopters, Inc., Parts Manufacturer Approval (PMA) P/N's 74-120-252-11 and 74- 120-135-5. (AD Docket No. 86-ASW-10). Compliance is required as indicated, unless already accomplished. To prevent failure of the main rotor blade grip, accomplish the following: (a) Inspect main rotor blade grips having 1,175 hours or more time in service on the effective date of this AD within the next 25 hours time in service, and thereafter at intervals not to exceed 300 hours time in service in accordance with paragraph (c) of this AD. (b) Inspect main rotor blade grips having less than 1,175 hours time in service prior to the accumulation of 1200 hours time in service and thereafter at intervals not to exceed 300 hours time in service in accordance with paragraph (c) of this AD. (c) Perform a fluorescent dye penetrant inspection of the main rotor blade threads in accordance with Military Standard No. MIL-STD-6866, dated November 29, 1985. The penetrant inspection requirements of MIL-STD-6866 paragraph 4.3 are not required. (d) Alternative inspections, modifications, or other actions which provide an equivalent level of safety may be used when approved by the Manager, Helicopter Certification Branch, Southwest Region, Federal Aviation Administration, P.O. Box 1689, Fort Worth, Texas 76101. Inspections performed in accordance with MIL-I-6866B through Amendment 3 provide an equivalent level of safety with paragraph (c) of this AD. The inspection requirements of paragraph 5.8 of MIL-I-6866B are not required. (e) This AD does not alter the time in service life limit of the main rotor blade grips. This procedure shall be done in accordance with Military Standard MIL-STD-6866, dated November 29, 1985. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. (a) and 1 CFR Part 51. Copies may be obtained upon request to the Commanding Officer, Naval Publications and Forms Center, 5801 Tabor Avenue, Philadelphia, Pennsylvania 19120, by referencing MIL-STD-6866 listed in D.O.D. Index of Specifications and Standards. Copies may be inspected at the Office of Regional Counsel, FAA, 4400 Blue Mound Road, Fort Worth, Texas, or at the Office of the Federal Register, 1100 L Street, NW., Room 8401, Washington, D.C. This amendment, 39-5626, becomes effective July 10, 1987. This amendment amends Amendment 39-5260 (51 FR 11300), AD No. 86-06-08. ## Affected data sheets (4) (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 H-1](https://openairdocs.org/tcds/H-1): Scott's-Bell 47 Inc; names 8 of 9 models: 47H-1, 47B, 47B3, 47D1, 47D, 47G-2, 47G, 47E - [TCDS 2H1](https://openairdocs.org/tcds/2H1): Scott's-Bell 47 Inc; names 4 of 4 models: 47K, 47J-2, 47J-2A, 47J - [TCDS H2GL](https://openairdocs.org/tcds/H2GL): Teryjon Aviation Inc.; names 1 of 1 models: Fast Kat I (U.S. Army OH-13S) ## 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: 491 (491 by airframe model, 0 by engine model) - Makers: Bell 477, Bell-K-Copter 3, Bell Kitz Kopters 1, Bell-Allied Helicopter 1, Bell-Carson 1, Bell-Huddleston And Wilson 1, Bell-Intermountain 1, Bell-Olympic Helicopters 1, Bell-Shippey 1, Bell-Tellijohn 1 Models with the most aircraft: - [Bell 47G-2](https://openairdocs.org/model/bell-47g-2): 87 aircraft (airframe model) - [Bell 47G-3B-1](https://openairdocs.org/model/bell-47g-3b-1): 86 aircraft (airframe model) - [Bell 47G](https://openairdocs.org/model/bell-47g): 55 aircraft (airframe model) - [Bell 47D1](https://openairdocs.org/model/bell-47d1): 47 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 47H-1](https://openairdocs.org/model/bell-47h-1): 6 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 47D](https://openairdocs.org/model/bell-47d): 4 aircraft (airframe model) - [Bell-K-Copter 47G](https://openairdocs.org/model/bell-k-copter-47g): 2 aircraft (airframe model) - [Bell 47B](https://openairdocs.org/model/bell-47b): 1 aircraft (airframe model) All 36 models: https://openairdocs.org/ad/86-06-08-R1/models.md Every aircraft: https://openairdocs.org/ad/86-06-08-R1/aircraft.md ## Related documents - [AD 2000-18-51](https://openairdocs.org/ad/2000-18-51) (historical): Main Rotor Blade Grip · Bell Helicopter Textron 47B, 47B3, 47D and 19 more. Effective Nov 30, 2000. Supersedes this AD 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.