Which combination of tools is commonly used to verify rotor alignment during reassembly?

• A. Dial indicators, laser alignment, and mounting templates.
• B. Telemetry sensors only.
• C. Visual inspection alone.
• D. X-ray imaging only.

Answer: (A)

When reassembling a rotor, getting the axis of the rotor to line up precisely with the engine centerline and the bearing and seal interfaces is essential to avoid vibration, uneven bearing loading, and leaks. Using a combination of mounting templates, dial indicators, and laser alignment provides a robust, quantitative approach. Mounting templates set the exact bolt patterns and mating faces so parts sit in the correct reference geometry. Dial indicators let you measure small runout and relative misalignment as you shim or tighten components, giving precise, step-by-step feedback. Laser alignment adds a high-precision straight reference along the rotor axis, quickly confirming both straightness and angular alignment over the span of the assembly. Together, they establish a fixed geometry, quantify deviations, and verify true alignment, which is more reliable than relying on monitoring sensors after assembly, visual checks alone, or imaging methods that aren’t practical for full reassembly alignment.