anengineer
9th Aug 2014, 20:44
I'm currently spending a fair bit of time flying around on ATR42's and noticed that the starboard prop stops quite quickly on shutdown compared to the port one which comes to a gentle slowdown and eventual stop.
Why is this ?
Ta !
717tech
10th Aug 2014, 08:07
The ATR42 uses the right engine as an APU (Auxillary Power Unit) to provide power to the aircraft during ground operations. To achieve this, there is a "Prop Brake" which effectively stops the propeller from spinning while leaving the engine running.
It's always interesting watching a Prop stop suddenly on the next bay.
anengineer
10th Aug 2014, 16:57
Ah, I see. Thanks for the info!