Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to CFM International (CFMI) CFM56-2, -2A, -2B, -3, -3B, -3C, -5, -5B, -5C series turbofan engines. This proposal would require initial and repetitive visual inspections of the fuel pump filter cover helicoil inserts and bolts for damage, and, if necessary, repair or replacement with serviceable parts. This proposal also would require the installation of new fuel pumps that incorporate an improved filter cover retention design (D-bolts) as terminating action to the inspections. This proposal is prompted by reports that fuel pump filter cover helicoil inserts have loosened or pulled out. The actions specified by the proposed AD are intended to prevent fuel leakage from between the fuel pump filter cover and gear housing, which could result in an engine fire and damage to the airplane.