Good evening house.
Our C130H aircraft returned back today from an FCF after an unsuccessful air start.
NTS check was successful and the engine feathered with a cruise engine shutdown procedure.
However, when on airstart following the stated procedures, the airstart went well until 60% RPM when all engine parameters wound down to zero and consequently prompted an immediate feather. A restart was attempted on the ground and was successful.
We have consulted our troubleshooting manuals but found nothing so if anyone has a suggestion to correct this problem would be appreciated. VMT