# AD 78-20-07: Shoulder Radius Fitting

- Type: Airworthiness directive
- Status: Current
- Products: Bell Helicopter Textron 204B, 205A-1 and 212
- Effective: October 25, 1978
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- Amendment: 39-3303
- Registered aircraft: 125 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/82CAA96AB9EA478886256A3400553EF1.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/78-20-07

## The airworthiness directive

78-20-07 BELL: Amendment 39-3303. Applies to Bell Models 204B and 205A-1 helicopters equipped with fittings, P/N 204-012-102-5, and model 212 helicopters equipped with fittings, P/N 212-010-103-5, certificated in all categories. Compliance required as indicated.

To prevent possible failure of a fitting as a result of a crack in the thrust shoulder radius, accomplish the following:

  (a) Remove main rotor inboard strap fittings with 1,100 or more hours total time in service on the effective date of this airworthiness directive (AD) within 100 hours time in service.

  (b) Remove main rotor inboard strap fittings with less than 1,100 hours total time in service on the effective date of this AD, prior to attaining 1200 hours' total time in service.

  (c) The retirement time of the fittings P/N 204-012-102-5 and 212-010-103-5 is reduced from 3,000 to 1,200 hours time in service.

This amendment is effective October 25, 1978.

## Affected data sheets (2) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS H1SW](https://openairdocs.org/tcds/H1SW): Bell Textron Inc.; names 2 of 5 models: 204B, 205A-1
- [TCDS H4SW](https://openairdocs.org/tcds/H4SW): Bell Textron Inc.; names 1 of 4 models: 212

## 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: 125 (125 by airframe model, 0 by engine model)
- Makers: Bell 117, Bell Helicopter Textron 6, Bell/Southwest Florida Aviatio 2

Models with the most aircraft:

- [Bell 205A-1](https://openairdocs.org/model/bell-205a-1): 56 aircraft (airframe model)
- [Bell 212](https://openairdocs.org/model/bell-212): 54 aircraft (airframe model)
- [Bell 204-B](https://openairdocs.org/model/bell-204-b): 7 aircraft (airframe model)
- [Bell Helicopter Textron 212](https://openairdocs.org/model/bell-helicopter-textron-212): 5 aircraft (airframe model)
- [Bell/Southwest Florida Aviatio 205 A1](https://openairdocs.org/model/bell-southwest-florida-aviatio-205-a1): 2 aircraft (airframe model)
- [Bell Helicopter Textron 205A-1](https://openairdocs.org/model/bell-helicopter-textron-205a-1): 1 aircraft (airframe model)

All 6 models: https://openairdocs.org/ad/78-20-07/models.md
Every aircraft: https://openairdocs.org/ad/78-20-07/aircraft.md

Its text cites no advisory circulars or STCs.

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