I have just watched Mayday episode 11, season 11, "Nowhere to Land" about TACA Flight 110 incident. Most key issues of the incident are clearly explained in the episode:
- Why both engines turned itself off,
- Why there was an overheating alert after restarting the engines (and they had to be shut off).
But, there was a short period of time between restarting the engines and manually shutting them off when pilots were claiming that (based on instruments) both engines are working (spinning), but there is no power / thrust being generated by them (i.e. plane has no power).
Either I missed something or this small issue was not explained.
What does it mean that engines are working (spinning?), but not generating any power? Does this refer to situations where only compressor fans are spinning in the cold section, but there is no fuel burnout in engine's hot section? Or is it something else?
And what can cause such situation? If I am not mistaken or not missing anything -- episode explains issues with heavy rain and hail that damaged fans, but says nothing about fuel distribution system, engine ignition or any other issue that could cause spinning engine to not generate any thrust.