PMA (Parts Manufacturer Approval) replacement parts are a viable solution to reducing costs, increasing reliability, and cutting downtimes.
Honeywell issued Service Bulletin AS907-72-9094 that calls for the replacement of the #4 carbon seal on the HTF7000/AS907 series engines.
While not a new technology, hydrodipping is not very prevalent in the aviation industry. However, it saves both time and money and results in the same high-gloss durable finish.
Duncan Aviation has created installation packages for the Aviation Clean Air (ACA) ionization system for Bombardier Global, Challenger 300, and Challenger 350 aircraft.
When these units require replacement, your only options are to: 1) buy a whole new servo unit or 2) upgrade the entire avionics package of the aircraft.