# AD 70-06-02: Tail Rotor Grip Assembly

- Type: Airworthiness directive
- Status: Current
- Products: Bell Helicopter Textron 204B, 205A and 205A-1
- Effective: March 13, 1970
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- Amendment: 39-955
- Registered aircraft: 66 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3B3256EE08FD401586256A340052BE82.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/70-06-02

## The airworthiness directive

70-06-02 BELL: Amdt. 39-955. Applies to all Model 204B 205A and 205A-1 helicopters and to any other helicopter incorporating tail rotor hub assembly, P/N 204-011-801-5 or -7 or P/N 204-011-701-11, -13 or -19 and to all spare tail rotor hub assemblies P/N 205-011-801-5 or -7 or P/N 204-011-701-11, -13 or -19.

Compliance required as indicated.

To prevent failure of the grip assemblies, P/N 204-011-728 or P/N 204-011-706, accomplish the following one time inspection on all tail rotor grip assemblies for proper hardness or conductivity before further flight, unless already accomplished after February 27, 1970. These inspections may be conducted with the grips installed on the helicopter. Determine the hardness of the grip assembly using a Rockwell Hardness or Eddy Current Tester, a Magnatest FM-120 (Magnaflux Corp.) or equivalent. Readings should be taken adjacent to vibro etched serial number between the blade retention bolts on grip face. Inspect all spare grip assemblies before installation. Remove grip assemblies with readings below Rockwell 79 on the "B" scale or above conductivity of 39 on International Annealed Copper Standard.

This supersedes Amendment 39-953 (AD 70-06-01) issued by telegram dated February 27, 1970.

This amendment is effective March 13, 1970, and was effective for all recipients of the telegram dated March 4, 1970 which contained this amendment.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS H1SW](https://openairdocs.org/tcds/H1SW): Bell Textron Inc.; names 3 of 5 models: 205A, 204B, 205A-1

## 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: 66 (66 by airframe model, 0 by engine model)
- Makers: Bell 63, Bell/Southwest Florida Aviatio 2, Bell Helicopter Textron 1

Models with the most aircraft:

- [Bell 205A-1](https://openairdocs.org/model/bell-205a-1): 56 aircraft (airframe model)
- [Bell 204-B](https://openairdocs.org/model/bell-204-b): 7 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 4 models: https://openairdocs.org/ad/70-06-02/models.md
Every aircraft: https://openairdocs.org/ad/70-06-02/aircraft.md

Its text cites no advisory circulars or STCs.

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