Low Rotor RPM warning systems
dg93 - its worth pointing out that the normal Wessex Nr was raised from its original 220 to 235 IIRC which gives you an even bigger margin when dealing with engine failures and decaying Nr.
An overspeed indicator is not required as the Overspeed Trip Governors are designe to shut down the engines if Nf exceeds specific values - even a double runaway up is contained.
The problem you might have - and what the Uruguayans found - was the serviceability of the fuel computers. However, we still use the same computer on the Sea King and if they are set up and maintained properly, they don't go wrong often - it will just be spares that will be the issue.
An overspeed indicator is not required as the Overspeed Trip Governors are designe to shut down the engines if Nf exceeds specific values - even a double runaway up is contained.
The problem you might have - and what the Uruguayans found - was the serviceability of the fuel computers. However, we still use the same computer on the Sea King and if they are set up and maintained properly, they don't go wrong often - it will just be spares that will be the issue.
