From 1 April, 1877, the ranks of Assistant Engineer First Class and Assistant Engineer Second Class were merged into one class, styled Assistant Engineer. After four years' service they were allowed to pass for the rank of Template:EngRN and after five years' service were to be eligible for promotion. They were to rank with but after Sub-Lieutenant's.
- Order in Council of 30 April, 1877.
- Order in Council of 28 March, 1903.