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GippsAero SB-GA8-2011-64

January 17, 2014

Applicability: Serial numbers from 004-165

 

Amendments:

Issue 1: Initial issue

Issue 2: Incorporation of thicker springs with increased tension and applicability increased.

Background:

Issue 2: The engine utilized in the GA8 and GA8TC are equipped with a Precision RSA fuel injection system that is composed of two primary components, a servo regulator and a flow divider.

To give redundancy and for compliance with FAR 23, the servo regulator has had the addition of two springs, one at the idler valve lever arm and the other at the mixture control lever. These springs will move the throttle or mixture control arms to a position that would ensure safe continuation of flight in the event of the disconnection of the respective control linkage.

This SB requires that the spring tension is sufficient to ensure that the throttle or mixture levers move to a position that will allow the engine to operate safely should a disconnection of a control cable occur.

If due to internal friction in the servo, the existing springs do not move the throttle or mixture arms to the positions required then new springs (p/no. GA8-710021-151 and GA8-710021-153) should be installed. If following the installation of the new springs the required position cannot be achieved then the servo should be rectified by an approved service center

Issue 1: To give redundancy and for compliance with FAR 23, two springs have been installed on the servo regulator on either side of idle valve lever arm and mixture control arm. These springs are intended to move the throttle or mixture control to its open or rich position, in a event of a control cable failure.

This SB requires that the spring be incorporated at the next scheduled maintenance inspection.

COMPLIANCE:  This Service Bulletin must be incorporated at the next scheduled maintenance inspection.

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