Summary
The Federal Aviation Administration (FAA) proposes to revise an existing airworthiness directive (AD) applicable to General Electric Company (GE) CF34-3A1, -3B, and -3B1 turbofan engines with scavenge screens part numbers (P/Ns) 4047T95P01 and 5054T86G02 installed in the B-sump oil scavenge system. That AD currently requires initial and repetitive visual inspections and cleaning of the B-sump scavenge screens until a screenless fitting is installed. This proposal requires the same initial and repetitive visual inspections and cleaning of the B-sump scavenge screens until a screenless fitting is installed. This proposal also corrects a typographical error, and introduces a less restrictive terminating action schedule. This proposal is prompted by the need to correct a typographical error and by the need to introduce a less restrictive terminating action schedule. The actions specified by the proposed AD are intended to prevent B-sump scavenge screen blockage due to coking whichcould result in ignition of B-sump oil in the secondary air system, fan drive shaft separation, and uncontained engine failure.