Airworthiness directives › 2018-05-03
AD 2018-05-03 Airworthiness Directives; Safran Helicopter Engines, S.A., Turboshaft Engines
Applicability*9
This AD applies to Safran Helicopter Engines, S.A., Arrius 2F turboshaft engines, with an oil system electrical magnetic plug magnetic head, part number (P/N) 9520011545, with serial numbers (S/Ns) DU4621 through DU5053 inclusive, installed.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Within 15 flight hours or 30 days, whichever occurs first after the effective date of this AD, and then after each flight, inspect the magnetic head installed on the rear electrical magnetic plug in accordance with the Accomplishment Instructions, paragraph 2.4.5, of Safran Helicopter Engines Alert Mandatory Service Bulletin (MSB) A319 79 4840, Version A, dated November 27, 2017. (2) Within 60 days after the effective date of this AD, replace each affected magnetic head, installed on the front or the rear electrical magnetic plug, with a part eligible for installation in accordance with the Accomplishment Instructions, paragraph 2.4.2, of Safran Helicopter Engines Alert MSB A319 79 4841, Version A, dated November 20, 2017. (3) After replacement of the magnetic head installed on the rear electrical magnetic plug, as required by paragraph (g)(2) of this AD, the repetitive inspections required by paragraph (g)(1) of this AD are no longer required.
Unsafe condition
This AD was prompted by reports from the manufacturer of a batch of non-conforming magnetic heads installed on electrical oil debris magnetic plugs. We are issuing this AD to prevent failure of the engine oil debris detection system. This unsafe condition, if not addressed, could result in the inability to detect engine bearing failures, failure of the engine, in-flight shutdown, and loss of the helicopter.
Affected ADs
None.
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