Hardening electronic controls does not eliminate unusual failure modes or cascading faults. A failed circuit board can still disable a critical system if there is no independent way to operate it. The example is a sailor manually holding a throttle rod so that a turbine continues to run after its normal controls fail. That arrangement can be inefficient and leave more maintenance for the repair yard, but it can still get the ship home. The discussion connects the same demand for redundancy to the later work required on Type 45 power systems.
Notable Point · 2:55:37-2:57:33
Keeping propulsion running after electronic controls fail
A manual throttle example explains why hardened electronics still need a fallback that can keep the ship moving.