Capital parts are spare parts which, although acknowledged to have a long life or a small chance of failure, would cause a long shutdown of equipment because it would take a long time to get a replacement for them. Capital parts are typically repaired or replaced during planned overhauls/scheduled inspections. As description implies, these Capital Parts are typically expensive and are depreciated over time.Operational consumables are typically consumed during operation and an example of these would be air filters, grease and lubricants, light bulbs, etc. (for a car, it would be washer fluid).