Commonwealth legislation

AD/EC 135/7 Amdt 1 - Automatic Engine Control

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legislative instrument

Plain English Summary

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This Airworthiness Directive revokes the prior AD and requires operators of Eurocopter EC135 T1 helicopters fitted with Arrius 2B1 engines to install a FADEC software update. The update is designed to stop a parameter discrepancy in the Fuel Main Metering Unit that can freeze the metering valve and display a FADEC FAIL, causing loss of automatic engine control.

The Civil Aviation Safety Authority’s delegate requires compliance; aircraft owners/operators must arrange and pay for the software installation within the AD’s compliance timeframe.

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Direct links to the current provisions in AD/EC 135/7 Amdt 1 - Automatic Engine Control.

AD/EC 135/7 Amdt 1 - Automatic Engine Control

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source
View image in the official source
Eurocopter EC 135 Series Helicopters

AIRWORTHINESS DIRECTIVE

View image in the official source

View image in the official sourceFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/EC 135/7 and issues the following AD under subregulation 39.1 (1) of CAR 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.

Background: The German Luftfahrt-Bundesamt has advised that several instances have been reported of a FADEC FAIL caution indication being displayed for one engine. The caution display was caused by a parameter discrepancy, which was generated within the Fuel Main Metering Unit and transmitted to the FADEC. This discrepancy may lead to “freezing” of the Fuel Main Metering Valve at its momentary position, resulting in loss of the automatic engine control in the affected system.

View image in the official sourceThe original issue of this Directive introduced a synchronisation procedure that prevented the occurrence of the discrepancy between the parameters and thus sustained the automatic engine control.

This amendment limits the applicability to EC 135 T1 helicopters fitted with Arrius 2B1 engines and requires the installation of a new software version designed to prevent failure of the automatic engine control in those helicopters.

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official sourceThe original issue of this Directive became effective on 2 November 2001.

Signature of Eugene Paul Holzapfel, Delegate of the Civil Aviation Safety Authority.

Eugene Paul Holzapfel

Delegate of the Civil Aviation Safety Authority 5 December 2001

View image in the official source

The above AD is notified in the Commonwealth of Australia Gazette on 9 January 2002.

Source text

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

1 AD/EC 135/7 Amdt 1 - Automatic Engine Control

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

Eurocopter EC 135 Series Helicopters

AIRWORTHINESS DIRECTIVE

For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/EC 135/7 and issues the following AD under subregulation 39.1 (1) of CAR 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.

The original issue of this Directive introduced a synchronisation procedure that prevented the occurrence of the discrepancy between the parameters and thus sustained the automatic engine control.

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

The original issue of this Directive became effective on 2 November 2001.

Eugene Paul Holzapfel

Delegate of the Civil Aviation Safety Authority 5 December 2001

The above AD is notified in the Commonwealth of Australia Gazette on 9 January 2002.