# AD 56-01-01: Ventral Fin Support

- Type: Airworthiness directive
- Status: Current
- Products: Scotts-Bell 47 47G and 47G-2
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- Registered aircraft: 152 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/40207276D6FA9C1B86256A34004F368D.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/56-01-01

## The airworthiness directive

56-01-01 BELL: Applies to Model 47G, Serial Numbers 666 Through 1411 and Model 47G2, Serial Numbers 1342 Through 1412.

Compliance required as soon as possible, but not later than January 31, 1956.

Ventral fin support angle braces, P/N 47-267-085-5 and -6 shafe the tail boom longeron, P/N 47-267-057-111 due to interference of these parts. The longeron must be inspected on both sides for wear and damage. Any damage of the longeron in excess of 0.008 inch, based on the diameter of the undamaged tube, must be repaired. 1/32 inch clearance must be provided between the support angle braces and the longeron. Additional rework of the 47-267-057-167 angle brace by the welding of a 1/16-inch steel plate, 3/4-inch x 3 inches, to the back of this part may be necessary to provide adequate clearance, if repair of the longeron by means of a split tube sleeve has been accomplished.

(Bell Mandatory Service Bulletin No. 103 dated September 30, 1955, covers this same subject and outlines the details of the inspection and repairs.)

## 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 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: 152 (152 by airframe model, 0 by engine model)
- Makers: Bell 142, Bell-K-Copter 3, Bell-Carson 1, Bell-Olympic Helicopters 1, Bell-Shippey 1, Bell-Tellijohn 1, Bell-Transworld Helicopter Cor 1, Bell-Yehnert 1, Continental Copters 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-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-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 11 models: https://openairdocs.org/ad/56-01-01/models.md
Every aircraft: https://openairdocs.org/ad/56-01-01/aircraft.md

Its text cites no advisory circulars or STCs.

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