Document ID: chunk:federal_register_of_legislation:F2014L01273:body:0:p2
Version: federal_register_of_legislation:F2014L01273
Segment Type: other
Provision Reference: 
Character Range: 2837–4373

definitions include situations where an aircraft is stationary and the landing gear collapses causing one or more blades to be substantially bent, or where a hanger door (or other object) strikes the propeller blade. These cases should be handled as sudden stoppages because of potentially severe side loading on the crankshaft flange, front bearing, and seal.
             The effective date of this AD is 26 September 2014.
Background:  This AD was originally issued in December 1991 to require the inspection, rework or replacement of the crankshaft drive gear, and the replacement of the crankshaft drive gear retainer bolt, at each removal of the crankshaft gear.

             AD/LYC/89 Amdt 1, which became effective on 6 January 1994, was issued to reflect revision B of Lycoming Mandatory Service Bulletin No. 475, which increased the number of engine models applicable.

             AD/LYC/89 Amdt 2, which became effective on 2 October 2003, was issued to reflect revision C of Lycoming Mandatory Service Bulletin No. 475, which revised details on crankshaft gears.

             AD/LYC/89 Amdt 3, which became effective on 30 September 2004, was issued to reflect the changes introduced by FAA AD 2004-10-14 Amendment 39-13644, superseding FAA AD 91-14-22 Amendment 39-6916.

             This AD, AD/LYC/89 Amdt 4, amends the compliance statement to more accurately reflect the circumstances which constitute a propeller strike event.

Mike Higgins
Delegate of the Civil Aviation Safety Authority

24 September 2014