Document ID: chunk:federal_register_of_legislation:F2008L00491:body:0:p2
Version: federal_register_of_legislation:F2008L00491
Segment Type: other
Provision Reference: 
Character Range: 2896–4344

days after the effective date of this AD; where there is a need to fit a replacement gear to an aircraft; or

                   Prior to 30 June 2012, whichever occurs first after the effective date of this AD.
                This Airworthiness Directive becomes effective on 20 February 2008.
Background:     Service Bulletin J41-A32-082 revision 1 was issued following two incidents where the nose landing gear failed to fully extend.  Repeat inspections of the NW shortening mechanism where required to detect binding at the capsule bearings.

                Following a third incident in 2005 where the nose landing gear failed to fully extend on an aircraft that had been inspected in accordance with J41-A32-082 rev 1, a review identified that changes were necessary to ensure the inspection would detect NLG assemblies at risk of seizure.  The changes comprise a modified 'freefall' test and a reduced repeat inspection frequency, these being introduced in revision 2 of the SB.  This AD is required to fully address the unsafe condition previously identified.

                In addition, modification JM41670 (Service Bulletin J41-32-084) has been developed.  This installs a nose landing gear with modified bearings and lubrication provisions in the shortening mechanism.  Embodiment of this modification also allows a revised inspection frequency.

David Punshon
Delegate of the Civil Aviation Safety Authority

14 February 2008