Commonwealth legislation

AD/AS 355/79 - Hydraulic System - Hydraulic Cut Off Function

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Commonwealth

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legislative instrument

Plain English Summary

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This Airworthiness Directive requires operators of Eurocopter AS 355 E helicopters (those not modified by Mod 073263) to change the aircraft electrical wiring per Eurocopter Alert Service Bulletin No. 29.00.04 (paras 2.A–2.C) to add a hydraulic cut‑off function that prevents flight‑control load unbalance after loss of hydraulic assistance. Issued under CASR subreg. 39.1(1), compliance was required before 31 December 2004 (effective 2 September 2004); operators bear the cost and must follow the manufacturer’s instructions to comply.

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AD/AS 355/79 - Hydraulic System - Hydraulic Cut Off Function

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COMMONWEALTH OF AUSTRALIA (Civil Aviation Safety Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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AIRWORTHINESS DIRECTIVE

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For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

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Eurocopter AS 355 (Twin Ecureuil) Series Helicopters

AD/AS 355/79 Hydraulic System - Hydraulic Cut Off Function

9/2004

Applicability: AS 355 E helicopters, pre Modification 073263.

Requirement: Modify the electrical wiring, in accordance with paragraphs 2.A., 2.B. and 2.C. of Eurocopter AS 355 Alert Service Bulletin No. 29.00.04. dated 14 April 2004.

Note: DGAC AD F-2004-090 refers.

Compliance: Before 31 December 2004.s

This Airworthiness Directive becomes effective on 2 September 2004.

Background: The actions required by this Directive are designed to eliminate the possibility of a load unbalance in the flight controls. This unbalance may occur after the loss of hydraulic assistance following a hydraulic failure.

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Bernard Malcolm Hole

Delegate of the Civil Aviation Safety Authority 20 July 2004

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The above AD is notified in the Commonwealth of Australia Gazette on 11 August 2004.

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Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

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COMMONWEALTH OF AUSTRALIA (Civil Aviation Safety Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

AIRWORTHINESS DIRECTIVE

Eurocopter AS 355 (Twin Ecureuil) Series Helicopters

AD/AS 355/79 Hydraulic System - Hydraulic Cut Off Function

9/2004

Applicability: AS 355 E helicopters, pre Modification 073263.

Requirement: Modify the electrical wiring, in accordance with paragraphs 2.A., 2.B. and 2.C. of Eurocopter AS 355 Alert Service Bulletin No. 29.00.04. dated 14 April 2004.

Note: DGAC AD F-2004-090 refers.

Compliance: Before 31 December 2004.s

This Airworthiness Directive becomes effective on 2 September 2004.

Bernard Malcolm Hole

Delegate of the Civil Aviation Safety Authority 20 July 2004