# AD 75-17-20: Main Rotor Blade

- Type: Airworthiness directive
- Status: Current
- Products: Airbus Helicopters SA341G
- Effective: August 19, 1975
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- Amendment: 39-2322
- Registered aircraft: 23 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/046A5D09B7A30FB686256A33006F8F50.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/75-17-20

## The airworthiness directive

75-17-20 SOCIETE NATIONALE INDUSTRIELLE AEROSPATIALE: Amendment 39- 2322. Applies to Model SA-341G "Gazelle" helicopters, serial numbers 1299 and lower, certificated in all categories.

Compliance is required within the next 100 hours' time in service, unless already accomplished in accordance with SA-341 Service Bulletin No. 65.10.

To detect excessive elongation of main rotor blade torsion strip stacks in service, and prevent consequent loss of helicopter control, accomplish the following:

  (a) Install three "tell-tale" devices on the main rotor hub in accordance with subparagraph 1C (1) of SA-341 Service Bulletin No. 65.10 dated February 27, 1975, or an equivalent approved by the Chief, Aircraft Certification Staff, FAA, Europe, Africa, and Middle East Region.

  (b) Prior to first flight of the day, visually check "tell-tale" device for condition of the frangible screw. If the frangible screw is found broken, rectify "tell-tale" installation and replace associated torsion strip stack in accordance with subparagraph 1C (2) of SA-341 Service Bulletin No. 65.10, dated February 27, 1975, or an equivalent approved by the Chief, Aircraft Certification Staff, FAA, Europe, Africa, and Middle East Region.

The check required by this AD may be performed by the pilot.

This amendment becomes effective August 19, 1975.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS H6EU](https://openairdocs.org/tcds/H6EU): Airbus Helicopters; names 1 of 2 models: SA341G

## 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: 23 (23 by airframe model, 0 by engine model)
- Makers: Aerospatiale 20, S N I A S 2, Eurocopter France 1

Models with the most aircraft:

- [Aerospatiale SA341G GAZELLE](https://openairdocs.org/model/aerospatiale-sa341g-gazelle): 20 aircraft (airframe model)
- [S N I A S SA341G](https://openairdocs.org/model/s-n-i-a-s-sa341g): 2 aircraft (airframe model)
- [Eurocopter France SA 341G](https://openairdocs.org/model/eurocopter-france-sa-341g): 1 aircraft (airframe model)

All 3 models: https://openairdocs.org/ad/75-17-20/models.md
Every aircraft: https://openairdocs.org/ad/75-17-20/aircraft.md

Its text cites no advisory circulars or STCs.

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