# AD 91-20-10: Main Rotor Grip - Type: Airworthiness directive - Status: Current - Products: Scotts-Bell 47 47G-2, 47G-2A, 47G-2A-1, 47G-3, 47G-3B-1, 47G-3B-2, 47G-3B-2A, 47G-4, 47G-4A, 47G-5, 47G-5A, 47J and 2 more - Effective: November 14, 1991 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Rotorcraft - Amendment: 39-8044 - Docket: 90-ASW-11 - Registered aircraft: 354 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/8BEF760B5E2BDD6886256A4D0071CF2C.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/91-20-10 ## The airworthiness directive 91-20-10 BELL HELICOPTER TEXTRON, INC.: Amendment 39-8044. Docket No. 90- ASW-11. Applicability: All Model 47G2, 47G2A, 47G2A1, 47G3, 47G3B1, 47G3B2, 47G3B2A, 47G4, 47G4A, 47G5, 47G5A, 47J, 47J2, and 47J2A helicopters, certificated in any category, with main rotor (M/R) grip part number (P/N) 47-120-252-11, installed. Compliance: Required within the next 50 hours' time in service after the effective data of this AD, unless already accomplished. To prevent failure of the M/R grip, which could result in loss of control of the helicopter, accomplish the following: (a) Visually inspect the M/R grip and determine if one of the following serial numbers is installed: IT- 0251, 0253, 0254, 0255, 0256, 0257, 0260, 0261, 0262, 0263, 0264, 0265, 0267, 0268, 0270, 0271,0272, 0273, 0274, 0275, 0276, 0277, 0278, 0279, 0280, 0281, 0282, 0284, 0285, 0286, 0289, 0290, 0291, 0293, 0294, 0295, 0296, 0297, 0299, 0300, 0302, 0303, 0306, 0308, 0312, 0313, 0315, 0316, 0317,0319, 0323, 0324, 0326, 0327, 0328, 0329, 0330, 0333, 0334, 0335 ITM- 0005, 0007, 0022, 0046, 0077, 0096, 0109, 0112, 0114, 0115, 0125, 0128, 0133, 0155, 0161, 0165, 0166, 0167, 0168, 0170, 0171, 0178, 0182, 0183, 0185, 0187, 0189, 0191, 0192, 0194, 0197, 0198, 0202, 0204, 0211, 0212, 0218, 0234, 0235, 0236, 0237, 0238, 0239, 0240, 0241, 0242, 0243, 0244, 0245, 0246, 0248, 0249, 0250, 0251, 0252, 0253, 0255, 0256, 0257, 0258, 0259, 0261, 0262, 0263, 0264, 0265, 0266, 0267, 0269, 0270, 0271, 0272, 0273, 0274, 0275, 0276, 0277, 0278, 0279, 0280, 0281, 0282, 0283, 0284, 0286, 0287, 0288, 0289, 0290, 0291, 0292, 0293, 0294, 0295, 0296, 0297 (b) If one of the M/R grips listed in paragraph (a) is installed, remove and replace with a serviceable part. (c) An alternate method of compliance or adjustment of the compliance times, which provides an equivalent level of safety, may be used if approved by the Manager, Rotorcraft Certification Office, Federal Aviation Administration, Fort Worth, Texas 76193-0170, telephone (817) 624-5170. NOTE: If any of the M/R grips identified in paragraph (a) are found, either installed or as spares, the FAA recommends that the parts be permanently marked or defaced so that they cannot be misconstrued as airworthy. This amendment (39-8044, AD 91-20-10) becomes effective on November 14, 1991. ## Affected data sheets (3) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS 2H3](https://openairdocs.org/tcds/2H3): Scott's-Bell 47 Inc; names 10 of 11 models: 47G-2A, 47G-3, 47G-4A, 47G-5A, 47G-5, 47G-3B-2A, 47G-3B-2, 47G-4… - [TCDS 2H1](https://openairdocs.org/tcds/2H1): Scott's-Bell 47 Inc; names 3 of 4 models: 47J-2, 47J-2A, 47J - [TCDS H-1](https://openairdocs.org/tcds/H-1): Scott's-Bell 47 Inc; names 1 of 9 models: 47G-2 ## 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: 354 (354 by airframe model, 0 by engine model) - Makers: Bell 347, Bell-Huddleston And Wilson 1, Bell-Intermountain 1, Bell-K-Copter 1, Bell-Olympic Helicopters 1, Bell-Tellijohn 1, Bell-Transworld Helicopter Cor 1, Bell-Yehnert 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-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-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-Tellijohn 47G-2](https://openairdocs.org/model/bell-tellijohn-47g-2): 1 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-K-Copter 47G-2](https://openairdocs.org/model/bell-k-copter-47g-2): 1 aircraft (airframe model) - [Bell-Transworld Helicopter Cor 47G-2](https://openairdocs.org/model/bell-transworld-helicopter-cor-47g-2): 1 aircraft (airframe model) - [Bell-Olympic Helicopters 47G2](https://openairdocs.org/model/bell-olympic-helicopters-47g2): 1 aircraft (airframe model) - [Bell-Yehnert 47G-2](https://openairdocs.org/model/bell-yehnert-47g-2): 1 aircraft (airframe model) All 22 models: https://openairdocs.org/ad/91-20-10/models.md Every aircraft: https://openairdocs.org/ad/91-20-10/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.