Taking an older aircraft off an engine program almost certainly seals its fate, guaranteeing that it will be parted out when the engines are due for a heavy inspection.
Background:
Of the four most recently parted out Falcon 50s, three were not on an engine program. Even high-pedigree, single-owner Falcon 900Bs are not immune. The two most recent 900Bs that were parted out also were not on an engine program. In fact, Falcon 50s and 900Bs are 75 percent more likely to be taken out of service and parted out if they do not have an engine program when the engines come due for heavy inspections.
The most expensive part of any aircraft is always the engines; a maxim becoming truer as the aircraft age and the airframes depreciate. If they are not enrolled on an engine program, then there is very little value left in the aircraft when one, two or all three engines are due for a major inspection or shop visit.
Here is a standard example: a 1988 model year Falcon 900B that would be worth $3.5m if on an engine program is now worth $1.8m because it is not on an engine program and has engines coming due for MPIs or CZIs. The aircraft also has a C check due, and needs paint, interior and avionics upgrades. When everything is added up, the inspections and modifications will cost more than the airplane is currently worth. Therefore, the decision is made to part it out. If it had been enrolled on
Article source: http://www.aviationpros.com/press_release/12371999/engine-assurance-program-eap-powering-aircraft-fuels-the-industry