Why the Royal Navy renewed machinery so aggressively

Machinery due for replacement was not necessarily on the verge of failure. Worldwide deployment and salt-water exposure encouraged frequent Royal Navy rebuilding. The helicopter comparison gives roughly three years between major rebuilds for naval aircraft, against five for the RAF and seven for the Army. Warspite's turbines illustrate how components could be renewed between major modernisations, although the recollection of the number of replacements is uncertain. Sacrificial anodes also needed regular renewal, with an estimated interval of eighteen months to two and a half years. Scheduled replacement differs from an immediate defect that would require withdrawal from service.