Airworthiness Directive · Amendment 39-18174 · Fuel flow sensor
Airbus Helicopters (Previously Eurocopter France) Helicopters
This AD applies to Airbus Helicopters Model AS355E, AS355F, AS355F1, and AS355F2 helicopters, certificated in any category, with a Fueltron flowmeter part number (P/N) 704A37-670-001 installed.
We are adopting a new airworthiness directive (AD) for Airbus Helicopters (previously Eurocopter France) Model AS355E, AS355F, AS355F1, and AS355F2 helicopters with a Fueltron flowmeter installed. This AD requires removing each flowmeter, replacing the fuel system hoses, and disabling the electrical connections for the flowmeter installation. This AD was prompted by a report of particle contamination creating an obstruction in a flowmeter which resulted in an uncontrolled flame-out of the engine. The actions of this AD are intended to prevent obstruction of the fuel supply to the flowmeter, which could result in engine flame-out and subsequent loss of control of the helicopter.
You are responsible for performing each action required by this AD within the specified compliance time unless it has already been accomplished prior to that time.
(1) Within 750 hours time-in-service:
(i) Remove each flowmeter.
(ii) Remove each left-hand hose, P/N 704A34.4160.31, and install hose, P/N 704A34-416-029, as depicted in Figures 1 and 2 of Eurocopter Alert Service Bulletin No. AS355-28.00.20, Revision 0, dated June 6, 2013 (ASB AS355-28.00.20).
(iii) Remove each right-hand hose, P/N 704A34.4160.32, and install hose, P/N 704A34-416-030, as depicted in Figures 1 and 2 of ASB AS355-28.00.20.
(iv) Remove each flowmeter indicator and disable the flowmeter wiring as described in the Accomplishment Instructions, paragraph 3.B.2.b., of ASB AS355-28.00.20.
(2) After the effective date of this AD, do not install a flowmeter, P/N 704A37-670-001, on any helicopter.
