Airworthiness Directive · Amendment 39-9151 · Honeywell International Inc. Engines
Honeywell International Inc. Engines
This AD applies to Honeywell International Inc. ALF502R-3, ALF502R-3A, ALF502R-4, ALF502R-5, ALF502R-6.
The models as the FAA's AD index lists them. The serial ranges, installed parts and exceptions are in the AD itself: read it at the FAA.
This amendment adopts a new airworthiness directive (AD), applicable to Textron Lycoming ALF502R series turbofan engines, that reduces the service life for the No. 2 stage turbine disk, reduces the service lives for No. 1 and No. 3 through No. 7 stage compressor rotor disks, and requires a scheduled removal of these disks from service. This amendment is prompted by reports of cracks in disks returned from the field and in disks tested by the manufacturer. The actions specified by this AD are intended to prevent disk failure resulting in a possible uncontained engine failure.
