Document ID: chunk:federal_register_of_legislation:F2006B08655:body:0:p2
Version: federal_register_of_legislation:F2006B08655
Segment Type: other
Provision Reference: 
Character Range: 3035–4450

manufactured crankshaft; within 50 hours time in service from the effective date of this directive or at the next periodic inspection after the effective date of this directive, whichever occurs first.

             3.    Spare engines:

             Prior to installation in an aircraft.

           This Amendment becomes effective on 4 November 1999.

           Background:  This directive was originally issued to require a once only inspection of crankshafts manufactured in 1998. The original requirement reflected advice of seven (7) crankshaft fractures which have occurred in engines fitted with crankshafts manufactured during 1998. An investigation of those fractures has revealed the crankshafts had been damaged during the counterweight bushing installation process.

           Amendment 1 added crankshafts rebuilt by TCM during the period of concern. This amendment has been issued to reflect:
                1. The manufacturer's revision to the original requirement document. MSB 99- 3C, in part, increases the critical compliance period from 300 to 500 hours, and

2.    The addition of GTSIO-520 and GIO-550 engines. The increase in engine models applicable reflects advice of a crack found in a GTSIO-520 crankshaft also manufactured during 1998.

           Amendment 1 of this Directive became effective on 16 June 1999. The original issue of this directive became effective on 12 May 1999.