Document ID: chunk:federal_register_of_legislation:F2005L03921:body:0:p2
Version: federal_register_of_legislation:F2005L03921
Segment Type: other
Provision Reference: 
Character Range: 3062–4633

time-in-service (TIS) after the effective date of this AD, or nine months after the effective date of this AD, or when the propeller is next disassembled after the effective date of this AD, whichever occurs first.

                   4. Before further flight after the effective date of this AD.

                   5. After the effective date of this AD.
                This Airworthiness Directive becomes effective on 19 January 2006.
Background:     The FAA and Hartzell Propeller Inc. have been reviewing and investigating reports of current design propeller blade thrust bearings, P/N's C-2882-1, C-2882-2, and
                C-7075, found fractured during disassembly, one or more blades becoming jammed in position during operation, pitch change fork fractures causing loss of blade pitch control, and excessive vibration.  The current design thrust bearings have demonstrated a tendency to have brittle fracture and reduced strength characteristics, for which the cause has yet to be determined.  This action requires replacement of the current design propeller blade thrust bearings, P/N's C-2882-1, C-2882-2, and
                C-7075, with a new design propeller blade thrust bearing, P/N C-7438, and a 10X magnification-assisted visual inspection and ECI of propeller hubs for cracks.  This condition, if not corrected, could result in loss of aircraft control due to loss of blade pitch control, inability to fully feather the propeller, hub fracture, and blade release.

James Coyne
Delegate of the Civil Aviation Safety Authority

30 November 2005