airworthiness · Rule · Final rule. · Published 2013-11-15 · Effective 2013-12-20 · 78 FR 68697
Document
Document number
2013-27185
Federal Register citation
78 FR 68697
Type
Rule
Action
Final rule.
Category
airworthiness
Manufacturer
Turbomeca S.A. Turboshaft
Publication date
2013-11-15
Effective date
2013-12-20
FAA docket
Docket No. FAA-2012-0940
Abstract
We are superseding airworthiness directive (AD) 2013-01-07 for all Turbomeca S.A. Arriel 2D turboshaft engines. AD 2013-01-07 required replacing the hydromechanical metering unit (HMU) at a reduced life. This AD maintains that requirement and also requires conducting inspections of the HMU. This AD was prompted by further cases of deterioration of HMU rotating components. We are issuing this AD to prevent an uncommanded in-flight shutdown of the engine and possible loss of the helicopter.