# AD 75-16-06: Tail Rotor Gear Box

- Type: Airworthiness directive
- Status: Current
- Products: Airbus Helicopters SA 3180-Alouette Astazou, SA 318B-Alouette Astazou, SA 318C-Alouette Astazou, SA.315B Alouette III, SA.316B Alouette III, SA.319B Alouette III, SE 3130-Alouette II, SE 313B-Alouette II and SE.3160 Alouette III
- Effective: July 28, 1975
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- Amendment: 39-2279
- Registered aircraft: 19 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/07F7983E0C889B3786256A33006F81E0.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/75-16-06

## The airworthiness directive

75-16-06 SOCIETE NATIONALE INDUSTRIELLE AEROSPATIALE: (S.N.I.A.S. formerly SUD AVIATION). Amendment 39-2279. Applies to Alouette Helicopters SE3130, SE313B, SA315B, SE3160, SA316B, SA3180, SA318B, SA318C, and SA319B equipped with tail rotor gearbox, P/Ns 3130S.66.20.000, 3130S.66.30.000, 3130S.66.40.000, 3130S.66.50.000, 3130S.66.60.000, or 3130S.66.70.000 without modification AM 1004, or P/Ns 3160S.66.00.000 or 3160.66.10.000 without modification AM 1582.

Compliance is required within the next 10 hours' time in service after the effective date of this AD, unless already accomplished in accordance with Lama Service Bulletin No. 01.03 for Model SA315B or Alouette Service Bulletin No. 01.29 for the other designated models.

To prevent possible jamming of the tail rotor directional control, accomplish the following:

  (a) Determine the width of the top of the square thread at each end of screws P/N 3130S.66.23.002 or 3130S.66.50.016. If the width is between 1.5 and 2.0 mm, the assembly may be reinstalled without further work.

NOTE: Access to the screws is gained by removing the tail rotor pitch change control shaft.

  (b) If the thread width is not within 1.5 and 2.0mm, rework the extreme end of the thread and reinstall the tail rotor pitch change assembly in accordance with Aerospatiale Service Bulletin No. 01.29 dated November 10, 1971 (except Aerospatiale Service Bulletin No. 01.03 dated November 10, 1971 for Model SA315B), or an equivalent approved by the Chief, Aircraft Certification Staff, FAA, Europe, Africa, and Middle East Region, c/o American Embassy, APO New York, NY 09667.

This amendment becomes effective July 28, 1975.

## Affected data sheets (2) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 7H1](https://openairdocs.org/tcds/7H1): Airbus Helicopters; names 5 of 5 models: SE 3130-Alouette II, SE 313B-Alouette II, SA 318C-Alouette Astazou, SA 3180-Alouette Astazou, SA 318B-Alouette Astazou
- [TCDS H1IN](https://openairdocs.org/tcds/H1IN): Airbus Helicopters; names 4 of 5 models: SA.316B Alouette III, SA.315B Alouette III, SE.3160 Alouette III, SA.319B Alouette III

## 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: 19 (19 by airframe model, 0 by engine model)
- Makers: Aerospatiale 9, S N I A S 7, Sud 3

Models with the most aircraft:

- [S N I A S SE 3130 ALOUETTE II](https://openairdocs.org/model/s-n-i-a-s-se-3130-alouette-ii): 7 aircraft (airframe model)
- [Aerospatiale SA315B ALOUETTE III](https://openairdocs.org/model/aerospatiale-sa315b-alouette-iii): 4 aircraft (airframe model)
- [Aerospatiale SA319B ALOUETTE III](https://openairdocs.org/model/aerospatiale-sa319b-alouette-iii): 3 aircraft (airframe model)
- [Sud SA316B ALOUETTE III](https://openairdocs.org/model/sud-sa316b-alouette-iii): 2 aircraft (airframe model)
- [Aerospatiale SA316B ALOUETTE III](https://openairdocs.org/model/aerospatiale-sa316b-alouette-iii): 2 aircraft (airframe model)
- [Sud SE3130 ALOUETTE II](https://openairdocs.org/model/sud-se3130-alouette-ii): 1 aircraft (airframe model)

All 6 models: https://openairdocs.org/ad/75-16-06/models.md
Every aircraft: https://openairdocs.org/ad/75-16-06/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.