Airworthiness directives › 2018-13-01
AD 2018-13-01 Airworthiness Directives; Rolls-Royce Corporation Turboshaft Engines
Applicability*9
This AD applies to Rolls-Royce Corporation (RRC) model 250-C10D, 250-C18, 250-C18A, 250-C18B, 250-C18C, 250-C19, 250-C20, 250-C20B, 250-C20C, 250-C20F, 250-C20J, 250-C20R, 250-C20R/1, 250-C20R/2, 250-C20R/4, 250-C20S, 250-C20W, 250-C28, 250-C28B, 250-C28C, 250-C30, 250-C30G, 250-C30G/2, 250-C30M, 250-C30P, 250-C30S, and 250-C30U turboshaft engines with power turbine governor (PTG) bearing assembly, part number (P/N) 2544198, installed.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Remove the bearing assembly, P/N 2544198, from the PTG in accordance with the compliance times in Figure 1 to paragraph (g) of this AD, or within 90 days after the effective date of this AD, whichever occurs later. ER12JY18.017 (2) After such removal, replace the affected PTG bearing assembly with a part eligible for installation before further flight.
Unsafe condition
This AD was prompted by several reports of loss of power, one of which resulted in a fatal helicopter accident. We are issuing this AD to prevent failure of the PTG bearing assembly. The unsafe condition, if not addressed, could result in failure of the PTG, failure of the engine, in-flight shutdown, and forced autorotation landing or accident.
Affected ADs
None.
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