airworthiness · Rule · Final rule. · Published 2016-05-31 · Effective 2016-07-05 · 81 FR 34265
Document
Document number
2016-12549
Federal Register citation
81 FR 34265
Type
Rule
Action
Final rule.
Category
airworthiness
Manufacturer
Turbomeca S.A. Turboshaft
Publication date
2016-05-31
Effective date
2016-07-05
FAA docket
Docket No. FAA-2016-2859
Abstract
We are adopting a new airworthiness directive (AD) for Turbomeca S.A. Arriel 1D and 1D1 turboshaft engines with a pre- modification (mod) TU357 gas generator module (M03), installed. This AD requires removing the pre-modification (mod) TU357 gas generator module (M03) and replacing with a part eligible for installation. This AD was prompted by reports of divergent rubbing between the piston shaft small diameter labyrinth and the rear bearing support. We are issuing this AD to prevent failure of the labyrinth seal and engine, in-flight shutdown, and loss of control of the helicopter.