AD/Arriel/28 Fuel Control Unit 3-way Union Plug (Cth)
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 39.001(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/28 | Fuel Control Unit 3-way Union Plug | 4/2008 |
Applicability: | Arriel 1E2, 1S and 1S1 turboshaft engines. Note 1: These engines are known to be installed on, but not limited to, Eurocopter Deutschland MBB-BK 117 series and Sikorsky S-76A series twin-engine helicopters. |
Requirement: | Perform a one time inspection of the correct reference of the plug installed on the FCU 3-way union (9 932 30 706 0) and verify its torque to be set between 1.3 and 1.5 daN.m in accordance with Turboméca Mandatory Service Bulletin 292 73 0817 dated 6 December 2007 or later NAA approved revision. Note 2: EASA AD 2008-0014 dated 17 January 2008 refers. |
Compliance: | Within 100 operating hours from effective date of this AD. |
| This Airworthiness Directive becomes effective on 10 April 2008. | |
Background: | A plug adapted for engine bench testing (called “red disk” plug) and not approved for service operation, could inadvertently be installed on the engine Fuel Control Unit Turboméca S.A. has informed EASA (EASA AD 2008-0014) of a case of a “red disk” plug that has been actually installed on an engine which has been subsequently released for service operation. This engine experienced an in-service high pressure leak event (at the fuel pump outlet) due to cracking of this “red disk” plug. This leak could lead to in-flight flame-out and/or possibly a fire. |
David Punshon
Delegate of the Civil Aviation Safety Authority
26 February 2008
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