# AD 75-22-07: Main Gear Boxes

- Type: Airworthiness directive
- Status: Current
- Products: Airbus Helicopters SA341G
- Effective: November 3, 1975
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- Amendment: 39-2401
- Registered aircraft: 23 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DF2ECF8A5035B9C286256A33006FAA26.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/75-22-07

## The airworthiness directive

75-22-07 SOCIETE NATIONALE INDUSTRIELLE AEROSPATIALE: Amendment 39- 2401. Applies to SA341G helicopters, certificated in all categories, equipped with main gear boxes P/N 341A.32.1000.01, .02, .03, or .05 with less than 25 hours time in service since new or overhauled, and that have not been altered in accordance with AMS 07.7077.

Compliance is required until the accumulation of 25 hours time in service on new and newly overhauled main gear box.

To detect main gear box (MGB) defects, accomplish the following:

  (a) Before each flight after the effective date of this AD check the MGB magnetic plug for particles and check the main gear box for abnormal friction points or noise by slowly rotating the main rotor by hand.

  (b) Before the first flight of each day after the effective date of this AD or within intervals of 5 hours MGB time in service after the last inspection, whichever occurs first, check the MGB oil filter for foreign metallic particles.

  (c) If highly heated and laminated (black) particles appear on the magnetic plug, or if fine particles deposited on the magnetic plug are preceded or accompanied by bronze particles left in the main gear box oil filter, or if abnormal friction points or noise is detected on the main gear box, prior to further flight replace main gear box with a serviceable part of the same part number incorporating Modification AMS 07.7077, or an FAA-approved equivalent. The checks required by this AD may be performed by the pilot.

(Aerospatiale's Service Bulletin No. 05.10 dated February 7, 1975, refers to this subject).

This amendment becomes effective November 3, 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/75-22-07/models.md
Every aircraft: https://openairdocs.org/ad/75-22-07/aircraft.md

Its text cites no advisory circulars or STCs.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.