Originally Posted by
Nescafe
True, but easy to say from the comfort of an armchair as opposed to a burning cockpit.
The preliminary report does not mention it as it concentrated on the collective issue, but it seems than the crew as lost the Essential buses.
If that the case the EEC remains in the last Governing governing mode, in that instance Automatic, therefore the ECL is inoperative to control the engine.
The EEC was reacting properly and driving the engine in overspeed when the crew was moving the collective lower torque tube directly connected to the grips ( input received from the LVDT’s).
The IDLE and FLIGHT mode input are directly received by the EEC so you can play with it even if the cockpit is de-powered. As the rotor collective pitch angle where kind of stuck in high collective demand so that when they were selected ting idle the rotor speed was dropping very quickly.
When they have selected the mode switch to OFF, the FMM solenoid fuel sob did not operate to close as it receives its power from the aircraft to close it (fail safe open). Reason why the engine has been found running still after the crash.