Airworthiness Directive · Amendment 39-18967 · Fuel control/turbine engines
Safran Helicopter Engines, S.A., Turboshaft Engines
This AD applies to all Safran Helicopter Engines, S.A., Arriel 1A1, 1A2, 1B, 1C, 1C1, 1C2, 1D, 1D1, 1E2, 1K1, 1S, and 1S1 turboshaft engines equipped with a drain valve assembly (DV) manufactured, repaired, or overhauled after December 31, 2015; with a diaphragm, part number 9 164 95 002 0, installed.
We are superseding airworthiness directive (AD) 2017-04-51 for all Safran Helicopter Engines, S.A., Arriel 1A1, 1A2, 1B, 1C, 1C1, 1C2, 1D, 1D1, 1E2, 1K1, 1S, and 1S1 turboshaft engines. AD 2017-04-51 required inspecting, wrapping, and replacing the affected drain valve assembly (DV) installed on these Arriel 1 engines. This AD requires inspecting and wrapping affected DVs and replacing those DVs found to be defective. This AD eliminates the terminating action that existed under AD 2017-04-51 and reduces the population of affected parts. This AD was prompted by reports of additional fuel leaks originating from the DV on certain Arriel engines. We are issuing this AD to correct the unsafe condition on these products.
(1) Within 10 flight hours or 7 days, whichever occurs first, after the effective date of this AD, visually inspect the affected DV for fuel leakage:
(i) If a fuel leak is detected, replace the affected DV with a DV eligible for installation, before the next flight.
(ii) If no fuel leak is detected, before the next flight, wrap the affected DV with a self-amalgamate tape or heat shrinkable tubing using the Accomplishment Instructions, paragraph 2.4, in Safran Helicopter Engines Alert Mandatory Service Bulletin (MSB) No. A292 73 0853, Version A, dated April 7, 2017.
(2) After wrapping an affected DV, as specified in paragraph (f)(1) of this AD, inspect the DV for fuel leakage before each first flight of the day. If a fuel leak is detected, replace the affected DV with a DV eligible for installation before the next flight.
(3) If, during any inspection required by this AD, the wrapping is found defective (loose, missing, or damaged), before the next flight, remove the wrap and re-wrap the affected DV using the Accomplishment Instructions, paragraph 2.4, of Safran Helicopter Engines Alert MSB No. A292 73 0853, Version A, dated April 7, 2017.
(4) If you replace the affected DV with another affected DV eligible for installation, you must still continue to perform the repetitive inspections required by paragraph (f)(2) of this AD.
From the effective date of this AD, do not install any engine with an affected DV on any helicopter unless the DV has been wrapped and is leak-free in accordance with the instructions in paragraph 2.4 of Safran Helicopter Engines Alert MSB No. A292 73 0853, Version A, dated April 7, 2017.
For the purpose of this AD, a DV eligible for installation is:
(1) A DV that is not affected by this AD; or
(2) a DV that is affected by this AD, is leak-free, and is wrapped in accordance with the Accomplishment Instructions, paragraph 2.4, of Safran Helicopter Engines Alert MSB No. A292 73 0853, Version A, dated April 7, 2017.
