Federal Register of Legislation - Australian Government

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AD/ARRIEL/22 Amdt 1 Airworthiness Directives/Pt 106 — Engines as made
HP/LP Fuel Pump Drive Components
Administered by: Infrastructure and Transport
Exempt from sunsetting by the Legislative Instruments Act 2003 s 54(2) item 9
Registered 20 Apr 2007
Tabling HistoryDate
Tabled HR08-May-2007
Tabled Senate09-May-2007
Date of repeal 13 Aug 2013
Repealed by CASA ADCX 015/13 - Revocation of Airworthiness Directives

 

AIRWORTHINESS DIRECTIVE

On the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/ARRIEL/22 and issues the following AD under subregulation 39.001(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.

Turbomeca Turbine Engines - Arriel Series

AD/ARRIEL/22 Amdt 1

HP/LP Fuel Pump Drive Components

5/2007

 

Applicability:

Turbomeca Arriel 2B, 2B1 and 2B1A turbo-shaft engines.

Requirement:

1.    Visually inspect the HP pump drive gear shaft splines and the coupling shaft assembly splines in accordance with Para 2 of TURBOMECA Mandatory Service Bulletin (MSB) No 292 73 2812 Revision 4 or later DGAC approved revisions.

2.    If inspection reveals signs of wear, as detailed in Para 2.B.1.d of MSB No 292 73 2812 Revision 4 or later DGAC approved revisions, replace the Hydromechanical Metering Unit (HMU) and coupling shaft assembly.

Note:  EASA AD No 2007-0044 dated 27 February 2007 refers. EASA AD 2007-0044 supersedes DGAC France AD F-2005-188 approved by EASA - reference number 2005-6408 dated 15 November 2005.

Compliance:

1.    If the adjusted HMU has logged more than 500 operating hours since new or since repair/overhaul:

Inspect within the next 30 operating hours after the effective date of this AD, unless previously accomplished, and then each time the HMU is removed/installed.

If the adjusted HMU has logged less than 500 operating hours since new or since repair/overhaul:

Inspect as soon as the HP/LP pumps assembly has reached 500 operating hours since new or since repair/overhaul, then each time the HMU is removed/installed.

2.    Before further flight after the effective date of this AD.

 

This Amendment becomes effective on 10 May 2007.

Background:

The deterioration of the splines on the HP/LP pump assembly drive shaft may eventually interrupt fuel supply and cause uncommanded in-flight engine shutdown.  The result may be an emergency autorotation landing or, at worst, an accident.

 

 

Two cases of in-flight shutdown resulting from splines deterioration have been reported for the ARRIUS 2B1 engine, which has the same HP/LP pump drive design as the ARRIEL 2.

The current amendment of the AD requires inspection within next 30 hours, unless already accomplished and makes reference to the latest revision status of the service document and to the latest EASA AD.

The original issue of this AD became effective on 19 January 2006.


Charles Lenarcic
Delegate of the Civil Aviation Safety Authority

27 March 2007