In drydock during rudder polishing, what measurements do you check?

flowchart LR
    A[Examine visible parts] --> B[Lift rudder/remove plates if needed]
    B --> C[Ascertain bearing clearances]
    C --> D[Record in dry-dock report]

• Rudder bearings: clearance between rudder stock and each bearing within maker’s and class limits
• Pintles and gudgeons: wear, corrosion, ovality, diameter at multiple points, bush clearance
• Rudder stock: wear, scoring, diameter reduction at journals, compare to IACS UI SC153 and class rules
• Rudder blade: thickness (ultrasonic), straightness, alignment, pitting/grooving depth
• Tiller connection: fit and clearance, play/looseness in bolts and keys
• Stern frame and coupling: wear or misalignment in pintle holes and steering gear coupling
• Governing instrument: IACS UR Z3 §Z3.2.4 requires examination of rudder, pintles, shafts, couplings, stern frame, bearing clearances, possible pressure test
• Officer’s action: lift rudder/remove plates, measure with correct gauges, record in dry-dock report, compare to maker/class limits, sign reports, rectify out-of-limit clearances