Summary
We propose to adopt a new airworthiness directive (AD) for certain Honeywell International Inc. (Honeywell) TPE331 model turboprop engines and TSE331-3U model turboshaft engines. This proposed AD was prompted by the discovery of cracks in a 2nd stage compressor impeller during a routine shop visit. This proposed AD would require removal of the 2nd stage compressor impeller. We are proposing this AD to prevent failure of the compressor impeller, uncontained part release, damage to the engine, and damage to the airplane.