# AD 73-19-02: Tail Rotor Yoke

- Type: Airworthiness directive
- Status: Current
- Products: Scotts-Bell 47 47B, 47B3, 47D, 47D1, 47E, 47G, 47G-2 and 47H-1
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- Amendment: 39-1717
- Registered aircraft: 212 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3A5ABFA51BBF332C86256A3400537D6E.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/73-19-02

## The airworthiness directive

73-19-02 BELL: Amdt. 39-1717. Applies to Bell Models 47B, 47B-3, 47D, 47D-1, 47E, 47G, 47G-2 and 47H-1 helicopters certificated in all categories.

Compliance required as indicated.

To prevent possible fatigue failure of the tail rotor yoke, P/N 47-641-057-9, remove and replace tail rotor yokes having S/N N29-1246 through N29-1266, N29-1298 through N29-1452, N29-10453 through N29-10488, and N29-10501 through N29-10525, as specified below.

  (a) Replace those yokes with 390 or more hours total time in service on the effective date of this AD, within 10 hours time in service.

  (b) Replace those yokes with less than 390 hours total time in service on the effective date of this AD, prior to accumulating 400 hours total time in service.

The requirements of this AD do not affect other Model 47 series helicopter tail rotor yokes.

(Bell Helicopter Co. Service Bulletin No. 47-05-73-1 dated August 22, 1973 pertains to this subject.)

This amendment becomes effective to owners and operators on receipt of the mailed amendment and becomes effective to all other persons on September 14, 1973.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [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

## 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: 212 (212 by airframe model, 0 by engine model)
- Makers: Bell 200, Bell-K-Copter 3, Bell Kitz Kopters 1, Bell-Allied Helicopter 1, Bell-Carson 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](https://openairdocs.org/model/bell-47g): 55 aircraft (airframe model)
- [Bell 47D1](https://openairdocs.org/model/bell-47d1): 47 aircraft (airframe model)
- [Bell 47H-1](https://openairdocs.org/model/bell-47h-1): 6 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)
- [Bell Kitz Kopters 47D1](https://openairdocs.org/model/bell-kitz-kopters-47d1): 1 aircraft (airframe model)
- [Bell-Allied Helicopter 47D1](https://openairdocs.org/model/bell-allied-helicopter-47d1): 1 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-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)
- [Continental Copters 47G](https://openairdocs.org/model/continental-copters-47g): 1 aircraft (airframe model)

All 17 models: https://openairdocs.org/ad/73-19-02/models.md
Every aircraft: https://openairdocs.org/ad/73-19-02/aircraft.md

Its text cites no advisory circulars or STCs.

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