Document ID: chunk:federal_register_of_legislation:F2006B08365:body:0:p3
Version: federal_register_of_legislation:F2006B08365
Segment Type: other
Provision Reference: 
Character Range: 5622–7802

beams as specified in Requirement 3 of this Directive.

               Note: FAA AD 97-26-16 Amdt 39-10259 refers.

                 Compliance: 1. Within 1,600 hours time in service after 23 April 1998 or at the next engine overhaul, whichever occurs first.

                 2.    Within 200 hours time in service after 23 April 1998.

                 3.    Within 9,600 hours time in service after the modification required by Requirement 1 or 2 of this Directive, as applicable, and thereafter at intervals not to exceed 9,600 hours time in service.

                  4.  (a) Within 1,600 hours time in service after 23 April 1998, and thereafter at intervals not to exceed 1,600 hours time in service; provided that no provision specified in Requirement 5 of this Directive occurs.

                  4. (b) Within 200 hours time in service after 23 April 1998, and thereafter at intervals not to exceed 200 hours time in service; provided that no provision specified in Requirement 5 of this Directive occurs.

               This airworthiness directive becomes effective on 23 April 1998.

               Background: Cracking of the engine mount beams has been experienced in service. Failure of the engine mount beam caused by fatigue cracks could result in loss of the engine with consequent loss of the aircraft.

               Amendment 3 introduced Revision 1 of the Requirement document and noted the related FAA AD.

               Amendment 4 is issued in response to a new FAA AD which requires incorporating engine mount kits that will eliminate the need for the on-going repetitive inspection requirement. The FAA has determined that reliance on critical repetitive inspections on aircraft utilised in commuter service carries an unnecessary safety risk when a design change exists that could eliminate or, in certain circumstances, reduce the number of those critical inspections.

               Amendment 3 of this airworthiness directive became effective on 31 December 1985. Amendment 2 of this airworthiness directive became effective on 30 June 1985.
               The original issue of this airworthiness directive became effective on 23 June 1981.