AD/ARRIEL/29 - Low Fuel Pressure Switch (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/29 Low Fuel Pressure Switch 7/2008

Applicability: Turboméca S.A. ARRIEL 2B, 2B1 and 2B1A turboshaft engines.

Note 1: These engines are known to be installed on, but not limited to Eurocopter AS 350 B3 and EC 130 B4 helicopters. Requirement: 1. Accomplish a one-time inspection of the Hydro Mechanical Unit (HMU) in accordance with paragraph 2 of Turboméca Mandatory Service Bulletin (MSB) 292 73 2826 to identify the low fuel pressure switch installed on adjusted HMU.

2. If a Hydra-Electric low fuel pressure switch Part Number (P/N) 9 550 17 956 0 is installed:

a. Inspect low fuel pressure switch and chamber of the HMU body.

i. If any parts from the low fuel pressure switch are missing or found in the HMU chamber, replace the HMU with a new or overhauled HMU equipped with an IN-LHC low fuel pressure switch.

ii. If not, replace only the low fuel pressure switch with an IN-LHC low fuel pressure switch.

3. If an IN-LHC low fuel pressure switch P/N 9 550 17 199 0 or P/N 9 550 17 913 0 is installed: