# AD 75-27-05: Main Rotor Blades

- Type: Airworthiness directive
- Status: Current
- Products: Airbus Helicopters SA 3180-Alouette Astazou, SA 318C-Alouette Astazou, SA.315B Alouette III, SA.316B Alouette III, SA.316C Alouette III, SA.319B Alouette III, SE 3130-Alouette II, SE 313B-Alouette II and SE.3160 Alouette III
- Effective: January 19, 1976
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- Amendment: 39-2477
- Registered aircraft: 19 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/774DBBB83C78885686256A3300705CC5.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/75-27-05

## The airworthiness directive

75-27-05 SOCIETE NATIONALE INDUSTRIELLE AEROSPATIALE: Amendment 39- 2477. Applies to Alouette helicopter Models SE-3130, SE-313B, SA-3180, SA-318C, SA-315B, SE-3160, SA-316B, SA-319B, and SA-316C incorporating 3130 series main rotor blade(s) with serial number 9554 and lower, and 3160 series main rotor blade(s) with serial number 6999 and lower. Compliance is required within the next 100 hours' time in service after the effective date of this AD, unless already accomplished in accordance with Lama Service Bulletin No. 01.04 for the Model SA- 315B, or Alouette Service Bulletin No. 01.30 for the other designated models.

To prevent failure of the main rotor blades due to corrosion, inspect the blade spar in the section between the attachment fitting and root end rib for corrosion, repair as necessary, and return to service, in accordance with paragraphs 2 B(2), 2 B(3), 2 B(4) and 2 C of SGAC- approved Alouette Service Bulletin No. 01.30, as amended August 30, 1972, or an equivalent approved by the Chief, Aircraft Certification Staff, FAA, Europe, Africa, and Middle East Region.

This amendment becomes effective on January 19, 1976.

## Affected data sheets (2) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

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

## 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/75-27-05/models.md
Every aircraft: https://openairdocs.org/ad/75-27-05/aircraft.md

Its text cites no advisory circulars or STCs.

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