Ka-50 right engine start bug

[cw4ogden]

I've seen this a few times, most commonly after shutting down and attempting a restart:

 

The right-hand engine starter switch / logic spools up the EGT instead of the N1. When this bug is present, the right-hand engine cutoff valve becomes very finicky, and can only be moved by clicking it in a very specific spot. No amount of switch-ology seems to remedy the bug, and the right engine will not start.

[Sh4rk]

The EGT always goes up before the N1 spools, because the N2 starts burning fuel first, then the airflow will drive the compressor. 

 

How or why is the right engine being stopped before being restarted?

 

I've seen that happen before, but usually when the engine is shot, flamed out or is cranked without the fuel valves open and pumps on, or throttle set higher than Idle. Things that break the engine or gearbox.

 

 

[cw4ogden]

Could be the throttle wasn't at idle.  Had it again just tonight, this time first aircraft start, not a restart.  But I do have the throttle mapped to a slider and I sometimes forget to check it's all the way back.  Have to see if I can reproduce it, but of what you listed the throttle is the only variable.  Maybe try a ground crew repair as well if I can reproduce, to see if it is a bug or a feature.  

[BIGNEWY]

Hi, do you have a short track replay with it happening, we could check it.

 

thank you