Summary
We are adopting a new airworthiness directive (AD) for Bell Model 427 and Model 429 helicopters. This AD requires replacing certain engine and transmission oil check valves. This AD also prohibits installing the affected check valves on any helicopter. This AD is prompted by a report of several cracked or leaking check valves. These actions are intended to detect and prevent a cracked or leaking check valve which could result in loss of lubrication to the engine or transmission, failure of the engine or transmission, and subsequent loss of control of the helicopter.
Directive Details
AD Number
FAA-2016-9144
Document Number
2016-23345
Type
Rule
Publication Date
September 30, 2016
Effective Date
October 17, 2016
Affected Manufacturer
Bell Helicopter Textron Canada Limited (Bell)
Criticality
important
Emergency
No
Docket ID
Docket No. FAA-2016-9144
Topics
Official Documents
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