Summary
We are adopting a new airworthiness directive (AD) for Agusta S.p.A. (Agusta) Model AB139 and AW139 helicopters with a certain generator control unit (GCU), to require replacing each affected GCU with an airworthy GCU. This AD was prompted by laboratory tests which revealed a potential fault in the overvoltage protection on a certain part-numbered GCU. The actions are intended to prevent failure of the overvoltage protection of the GCU, degraded performance of the electrical power generation and distribution systems, a fire, and subsequent loss of control of the helicopter.
Directive Details
AD Number
FAA-2012-0013
Document Number
2012-14797
Type
Rule
Publication Date
June 25, 2012
Effective Date
July 30, 2012
Affected Manufacturer
Agusta S.p.A.
Criticality
important
Emergency
No
Docket ID
Docket No. FAA-2012-0013
Topics
Official Documents
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