-Production (manufacturing), engine parts, until the aircraft itself.2.) maintenance (Maintenance Repair Overhaul MRO). the maintenance, repair, repair of large sub.3) training (training) pilot mechanic related personnel.
Production (manufacturing) manufacturing aircraft engine spare parts to the second), maintenance (MRO Maintenance Repair Overhaul) maintenance repair overhaul sub 3) training (training) pilot, mechanic personnel involved.