FAA Issues AD on Honeywell ALF502/507

The FAA has issued an airworthiness directive for all Honeywell ALF502L-2C; ALF502R-3; ALF502R-3A; ALF502R-5; LF507-1F; and LF507-1H turbofans. The AD was prompted by two reports of engines experiencing uncontained release of low-pressure (LP) turbine blades. The AD requires operational checks of the engine overspeed trip system to prevent LP turbine overspeed, which could lead to uncontained release of the LP turbine blades and damage to the airplane.