How do you remove a tail shaft and what surveys apply?

flowchart TD
    A[Drydock] --> B[Remove propeller & rudder]
    B --> C[Strip rope guard]
    C --> D[Measure wear-down]
    D --> E[Draw tail shaft]
    E --> F[Expose stern-tube bushes & seals]
    F --> G[magnetic-particle inspection of cone/flange fillet]
    G --> H[Remove key - inspect keyway]
    H --> I[Repack stern gland]
    I --> J[Reassemble & test]

• Removal steps: Drydock, remove propeller and often rudder, strip rope guard, measure shaft wear-down, withdraw shaft aft with drawing gear, support on rollers/cradles
• Inspection: Stern-tube bushes/seals for wear/scoring/damage, magnetic-particle inspection of cone/flange fillet, keyway for fretting/damage (if keyed)
• Reassembly: Refit tail shaft/propeller/rudder, reconnect coupling, repack stern gland per maker’s spec, test sealing on sea trial
• Surveys: Tail-shaft survey (IACS UR Z21: wear-down, withdrawal for inspection), rudder/propeller exam (IACS UR Z3: clearances, oil-gland efficiency), timing (IACS UR Z15: at drydockings, FVC renewal)
• Records: Wear-down sheet, MPI report, stern-gland repacking log, surveyor’s report
• Second Engineer role: Plan with Chief Engineer, verify lifting/rigging, supervise measurements/MPI, witness class surveyor, sign reports, address non-conformities, update PMS/file docs per SMS