Document ID: chunk:federal_register_of_legislation:F2009L02661:body:0:p2
Version: federal_register_of_legislation:F2009L02661
Segment Type: other
Provision Reference: 
Character Range: 2895–5425

detailed in the original issue of this AD as within 12 months from 28 August 2008 (The effective date of the original issue of this AD), unless previously accomplished.

             For Requirement 2 - Within the next 18 months after the effective date of this AD.

             For Requirement 3 - After 12 December 2010.
             This Amendment becomes effective on 30 July 2009.
Background:  Due to their position on the aeroplane, fuel crossfeed valve actuators P/N 9409122 are susceptible to freezing, which has an adverse effect on the operation of the valve.  This condition, if not corrected, may generate fuel asymmetry alerts when a valve remains in the open position after being selected closed.  It may also prevent the flight crew from correcting a fuel asymmetry when a valve remains in the closed position after being selected open.  One event was reported where, due to such problems, the flight crew shut down an engine in-flight and diverted the aircraft.

             Aeroplanes with 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 crossfeed valves.  As a result, those aeroplanes are also affected by this unsafe condition.

             To address and correct this unsafe condition, EASA issued AD 2008-0126 that required the replacement of all P/N 9409122 fuel crossfeed valve actuators in accordance with Fokker Services SBF100-28-046 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 SBF100-28-061 to introduce these improved actuators on aeroplanes.

             This AD also allows direct installation of P/N 53-0027 on aeroplanes that are still in pre-SBF100-28-046 configuration.

   The original issue of this AD became effective on 28 August 2008.

James Coyne
Delegate of the Civil Aviation Safety Authority

16 June 2009