Document ID: chunk:federal_register_of_legislation:F2009L01553:body:0:p3
Version: federal_register_of_legislation:F2009L01553
Segment Type: other
Provision Reference: 
Character Range: 5695–8029

Within 3 months after 15 January 2009, unless previously accomplished.

             For Requirements 2 and 3 - Remains unchanged as detailed in the original issue of this AD as: Within 8 months after 15 January 2009, unless previously accomplished.

             For Requirement 4 - Remains unchanged as detailed in the original issue of this AD as: Within 18 months after the 15 January 2009 or before accumulation of 5,000 LDG since new or last overhaul for the MLG shock absorber, whichever occurs first.

             For Requirement 5 - Before accumulation of 3,000 LDG since new or last overhaul.

             For Requirement 6 - At intervals not to exceed 1,900 LDG.

             For Requirement 7 - Before accumulating 6,000 landings or 12 years, since new or since last overhaul, whichever occurs first, and unless previously accomplished.

             For Requirement 8 - From the effective date of this AD.
             This Amendment becomes effective on 7 May 2009.
Background:  During the overhaul of a MLG of a Falcon 2000, the sleeve on the hydraulic flow restrictor in the shock absorber was found displaced because of the rupture of its three retaining screws.  In this situation, the energy dissipation function of the shock absorber is lost and high loads may be transmitted to the aircraft structure during landing.  Structural integrity may thus not be guaranteed over the entire certified landing conditions domain particularly in combination of high landing weight and high vertical speed.  The failure of the retaining screws has been determined to be the final phase of a slow unscrewing process under normal operational conditions.  The unsafe condition only exists once the three screws have failed.

             This AD requires a repetitive borescope inspection of the flow restriction system and, if necessary, repair of the shock absorber.  This AD also mandates the update of the operator's maintenance programme to include a revision of the "Check after Hard Landing" MP calling for borescope inspection.

   Amendment 1 introduces a terminating action to the repetitive inspections detailed in the AD.  The terminating action is mandatory.

   The original issue of this AD became effective 15 January 2009.

James Coyne
Delegate of the Civil Aviation Safety Authority

27 March 2009