Document ID: chunk:federal_register_of_legislation:F2009L03437:body:0:p2
Version: federal_register_of_legislation:F2009L03437
Segment Type: other
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Character Range: 2877–4957

freezing, which has an adverse effect on the operation of the valve.  Also, due to various causes, the failure rate of actuator P/N 9409122 is higher than expected.  Failure or freezing of the actuator may prevent the flight crew to close the fuel fire shut-off valve in case of an engine fire.

             Aeroplanes serial numbers 11244 through 11441 were delivered from the production line with actuators P/N 9401037 ("chimney type") installed.  However, on some aeroplanes, these actuators have subsequently been replaced in service with actuators P/N 9409122 (using mounting blocks P/N 7923505) on one or both fuel fire shut-off valves.  As a result, those aeroplanes are also affected by this unsafe condition.

             To address and correct this unsafe condition, CASA issued AD/F100/92 (EASA AD 2008-0193), requiring the replacement of all P/N 9409122 fuel fire shut-off valve actuators with new actuators developed by the manufacturer Eaton Aerospace, P/N 53-0013, which have improved reliability and are less susceptible to freezing.

             Following the introduction of actuator P/N 53-0013 in service, Eaton Aerospace reported manufacturing and design errors on actuators with P/N 53-0013.  As a result of these errors, the top-cap of the actuator may become loose, possibly leading to actuator failure.  Eaton Aerospace has eliminated these problems by introducing a new actuator P/N 53-0027 and Fokker Services have published SBF100-76-020 to introduce these improved actuators on aeroplanes.

             As a consequence of AD/F100/92, both P/N 9409122 and P/N 53-0013 fuel fire shut-off valve actuators are currently installed on aeroplanes affected by this AD.

             For the reasons described above, this AD supersedes AD/F100/92 and requires the installation of new P/N 53-0027 actuators.  This AD also prohibits the installation of P/N 53-0013 actuators in accordance with SBF100-76-018 (which has been cancelled), as previously required by AD/F100/92.

James Coyne
Delegate of the Civil Aviation Safety Authority

14 August 2009