During disassembly, marking parts helps with what purpose?

• A. To decorate the parts.
• B. To ensure correct reassembly and orientation.
• C. To identify the manufacturer.
• D. To track color coding for inventory.

Answer: (B)

Marking parts during disassembly helps ensure correct reassembly and orientation. In a turbine engine, many parts can look similar or fit in multiple places, but they have specific mating surfaces, face a particular direction, or align with keyed features. Keeping a mark on each part lets you return it to its exact original position and orientation, preserving proper flow paths, seal interfaces, bearing seating, and clearance. This reduces the risk of misassembly, which could lead to leaks, imbalance, or improper operation.

Decorating parts is not the purpose, identifying the manufacturer isn’t needed for reassembly, and color-coding for inventory doesn’t guarantee correct orientation or fit.