Commonwealth legislation

AD/EC 135/8 - FADEC Fail Warning Light

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

This Directive requires operators of Eurocopter EC135 T1 helicopters to insert specified pages from Eurocopter Alert Service Bulletin EC135-71A-024 into the Aircraft Flight Manual and to follow a pilot synchronisation procedure. It responds to reports of a FADEC FAIL caution caused by parameter discrepancies that can freeze the fuel main metering valve and disable automatic engine control; compliance is required before the next flight (effective 27 September 2002).

JSON API

Deep dive

Want the full deep dive?

Zoe can write the in-depth analysis on top of the summary above: how it works, who it affects and what each part actually does.

Current sections

Direct links to the current provisions in AD/EC 135/8 - FADEC Fail Warning Light.

AIRWORTHINESS DIRECTIVE

View image in the official source

View image in the official source
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 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.

Eurocopter EC 135 Series Helicopters

AD/EC 135/8 FADEC Fail Warning Light 12/

AD/EC 135/8 FADEC Fail Warning Light 12/2002

Applicability: All Model EC 135 T1 helicopters.

Requirement: Amend the Aircraft Flight Manual (AFM) by inserting the appropriate pages enclosed as Appendices 1 through 4 to Eurocopter Alert Service Bulletin EC135-71A-024 dated 6 August 2002.

Note: LBA AD 2002-333 refers.

Compliance: Before further flight after the effective date of this Directive.

This Airworthiness Directive becomes effective on 27 September 2002.

Background: The German Luftfahrt-Bundesamt has received reports of a FADEC FAIL caution indicatio n being displayed on EC 135 T1 helicopters. This was caused by a discrepancy in the parameters which were generated within the fuel main metering unit and transmitted to the FADEC. This discrepancy can lead, on appearance of the FADEC FAIL caution indication, to ‘freezing’ of the fuel main metering valve at its momentary position, resulting in loss of the automatic engine control in the affected system. Despite measures undertaken by Turbomeca for elimination of the problem (software improvements TU19C, TU23C and TU45C), a few further FADEC FAIL cases have occurred on EC 135 T1 helicopters, for which no explanation has yet been found and by which a discrepancy in parameters at the cause cannot be ruled out.

This Airworthiness Directive introduce an AFM amendment which provides a synchronisation procedure for pilots, which has been used in the past, which prevents the parameter discrepancy arising and thus sustains the automatic engine control.

Signature of James Coyne, Delegate of the Civil Aviation Safety Authority.

James Coyne

Delegate of the Civil Aviation Safety Authority 26 September 2002

View image in the official source

The above AD is notified in the Commonwealth of Australia Gazette on 27 September 2002.

Source text

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

AIRWORTHINESS DIRECTIVE AIRWORTHINESS DIRECTIVE

AIRWORTHINESS DIRECTIVE

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 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.

Eurocopter EC 135 Series Helicopters

AD/EC 135/8 FADEC Fail Warning Light 12/ AD/EC 135/8 FADEC Fail Warning Light 12/2002

AD/EC 135/8 FADEC Fail Warning Light 12/2002

Applicability: All Model EC 135 T1 helicopters.

Requirement: Amend the Aircraft Flight Manual (AFM) by inserting the appropriate pages enclosed as Appendices 1 through 4 to Eurocopter Alert Service Bulletin EC135-71A-024 dated 6 August 2002.

Note: LBA AD 2002-333 refers.

Compliance: Before further flight after the effective date of this Directive.

This Airworthiness Directive becomes effective on 27 September 2002.

James Coyne

Delegate of the Civil Aviation Safety Authority 26 September 2002