What is the purpose of cleaning and filtration in contamination control during overhaul?

• A. To increase weight
• B. Remove particulates and prevent recontamination; use cleanroom practices, filtration, lint-free materials
• C. For decorative purposes
• D. To improve color of oil

Answer: (B)

Cleaning and filtration during overhaul target controlling contamination by removing particulates and preventing recontamination as work progresses. This reduces the risk that dust, fibers, or metal particles enter tight passages, seals, or bearing surfaces, which could cause wear or failure. Filtration lowers airborne particulates, while cleanroom practices and lint-free materials minimize shedding from tools, garments, and materials, keeping surfaces and fluids as clean as possible. The aim is to maintain a contamination-free environment so components can be inspected, assembled, and tested reliably. The other options don’t address this purpose: increasing weight isn’t a goal of cleaning, decorative purposes are irrelevant, and improving oil color has no relation to preventing contamination.