What is the purpose of alignment checks during engine reassembly?

• A. To verify fuel metering accuracy at idle conditions.
• B. To ensure correct orientation and spacing of rotors and accessories, preventing rubbing and leaks.
• C. To confirm the electrical grounding of turbine components.
• D. To balance the aircraft's overall weight distribution.

Answer: (B)

Alignment checks during engine reassembly ensure rotors, gears, and accessories are oriented and spaced correctly so mating surfaces, seals, and bearing housings line up. When alignment is correct, rubbing between rotating parts is prevented, and oil and air seals stay leak-free, preserving performance and preventing damage. The process involves verifying bore alignment with dowel pins or fixtures, checking end play and runout with indicators or shims, and ensuring accurate positioning of the accessory drive and fuel-control interfaces. If misalignment is found, components are repositioned or shimmed before final torquing. Other options don’t fit because fuel metering accuracy is a calibration matter, electrical grounding is an electrical integrity issue, and overall weight distribution is a systems-level consideration rather than an alignment check during reassembly.