# AD 72-02-05: Control Rod Assembly - Type: Airworthiness directive - Status: Current - Products: Scotts-Bell 47 47G, 47G-2, 47G-2A, 47G-2A-1, 47G-3, 47G-3B, 47G-3B-1, 47G-3B-2, 47G-4, 47G-4A, 47G-5, 47J and 2 more - Effective: February 22, 1972 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Rotorcraft - Amendment: 39-1380 - Registered aircraft: 403 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5B0E7D1548A2C9C786256A3400532488.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/72-02-05 ## The airworthiness directive 72-02-05 BELL: Amdt. 39-1380. Applies to: Bell Models 47G-2A, 47G-2A-1, 47G-3, 47G-3B, 47G-3B-1, 47G-3B-2, 47G-4, 47G-4A, 47G-5, 47J-2, and 47J-2A helicopters certificated in all categories; Bell Model 47J helicopters, S/N 1777 and subsequent, certificated in all categories; and Bell Models 47G, 47G-2, and 47J helicopters, S/N 1420 through 1776, certificated in all categories incorporating Bell Mast Controls Kit No. 47-3411-1, Service Instruction No. 333. Compliance required as indicated. To detect possible cracks in the tube surface of control rod assembly, P/N 47-150-255-1, accomplish the following: (a) Inspect both control tubes within 100 hours time in service after the effective date of this AD, unless already accomplished, in accordance with the procedures listed below and accomplish repetitive inspections at intervals of not more than 1200 hours time in service from the last inspection. (b) Inspect the complete external surface of the tube for indications of cracks using a dye penetrant or equivalent inspection method. (c) If crack indications are found polish out and blend all indications into the adjacent areas and reinspect as follows: (1) Use 240 or 320 grit paper then use 400 grit paper for final polish. Sand only in the lengthwise direction of the tube. (2) Do not exceed .005 inch deep removal of material. Circumferential (transverse) cleanup of indication is limited to one-fourth of the tube circumference. There is no restriction of the longitudinal length limit. (3) Reinspect the polished surface of the tube for cracks using a dye penetrant or equivalent inspection method. (4) If cracks are found remove the cracked tube before further flight. (d) If no crack indications are found protect any exposed surfaces of the tube using zinc chromate primer or equivalent. (Bell Helicopter Service Bulletin No. 47-146 dated August 26, 1971 pertains to this subject.) This amendment becomes effective February 22, 1972. ## 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 9 of 11 models: 47G-2A, 47G-3B, 47G-3, 47G-4A, 47G-5, 47G-3B-2, 47G-4, 47G-2A-1… - [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 2 of 9 models: 47G-2, 47G ## 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: 403 (403 by airframe model, 0 by engine model) - Makers: Bell 391, Bell-K-Copter 3, Bell-Carson 1, Bell-Huddleston And Wilson 1, Bell-Intermountain 1, Bell-Olympic Helicopters 1, Bell-Shippey 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](https://openairdocs.org/model/bell-47g): 55 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-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 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-K-Copter 47G](https://openairdocs.org/model/bell-k-copter-47g): 2 aircraft (airframe model) - [Bell-Shippey BELL 47G](https://openairdocs.org/model/bell-shippey-bell-47g): 1 aircraft (airframe model) - [Bell-Carson 47G](https://openairdocs.org/model/bell-carson-47g): 1 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) All 26 models: https://openairdocs.org/ad/72-02-05/models.md Every aircraft: https://openairdocs.org/ad/72-02-05/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.