The Admiralty had originally planned to give "Eagle" a complete rebuild on the lines of , but due to high costs, plans to fit new geared steam turbines and a stretched hull were abandoned. "Eagle" was instead given a more austere but extensive modernization that provided greater radar and processing capability than the systems fitted to "Victorious". The changes included major improvements to the accommodation, including the installation of air conditioning. The island was completely rebuilt and a 3D Type 984 radar was installed, with processing capacity to track and rank 100 targets, twice the capability of the early 984 system fitted to "Hermes" and "Victorious". The flight deck was modified and included a new 2½ inch armoured deck with a full 8.5 degree angle, two new steam catapults (BS5s, stroke on the port side forward and stroke in the waist) were fitted as well as new arrester gear (DAX I) and mirror sights. As well as an overhaul of the DC electrical systems, AC generators were also fitted to give additional power.