# AD 75-21-03: Tail Boom

- Type: Airworthiness directive
- Status: Current
- Products: Airbus Helicopters SA.316B Alouette III, SA.316C Alouette III, SA.319B Alouette III and SE.3160 Alouette III
- Effective: October 20, 1975
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- Amendment: 39-2381
- Registered aircraft: 7 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/EA5D8D149BCB20E486256A33006FA393.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/75-21-03

## The airworthiness directive

75-21-03 SOCIETE NATIONALE INDUSTRIELLE AEROSPATIALE (formerly Sud Aviation). Amendment 39-2381. Applies to Alouette III Model SE.3160, SA.316B, SA.316C, and SA.319B helicopters incorporating tail boom P/N 3160S.23.11.000.9 to 3160S.23.11.000.13, inclusive, certificated in all categories.

Compliance is required as indicated, unless already accomplished in accordance with Alouette Service Bulletin No. 53.31.

To prevent failure of the tail boom, accomplish the following:

  (a) Within the next 10 hours' time in service after the effective date of this AD, and thereafter at intervals not to exceed 50 hours' time in service since the last check, until reinforced in accordance with paragraph (d) of this AD, check the upper section of the tailboom at Frame 8 for loose rivets.

  (b) If more than one rivet is found loose, comply with paragraph (d) of this AD before further flight, except that the helicopter may be flown in accordance with FAR Sections 21.197 and 21.199 to abase where the work can be performed.

  (c) If no more than one rivet is found loose, within the next 400 hours' time in service after the effective date of this AD, comply with paragraph (d) of this AD.

  (d) Where required by paragraph (b) or (c) of this AD, reinforce the tail boom attachment at Frame 8 in accordance with subparagraph 1C of Alouette Service Bulletin No. 53.31, as revised April 29, 1974, or equivalent approved by the Chief, Aircraft Certification Staff, FAA, Europe, Africa, and Middle East Region, c/o American Embassy, A.P.O. New York, N.Y. 09667.

The checks required by paragraph (a) of this AD may be performed by the pilot.

This amendment becomes effective October 20, 1975.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS H1IN](https://openairdocs.org/tcds/H1IN): Airbus Helicopters; names 4 of 5 models: SA.316C Alouette III, SA.316B 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: 7 (7 by airframe model, 0 by engine model)
- Makers: Aerospatiale 5, Sud 2

Models with the most aircraft:

- [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)

All 3 models: https://openairdocs.org/ad/75-21-03/models.md
Every aircraft: https://openairdocs.org/ad/75-21-03/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.