[a320] engine operations on ground in icing conditions

[giord]

Hello ppruners,

First of all best wishes for the festive season!

I would like to ask why the above mentioned procedure varies considerably according to different engine manufacturers. For instance on CFM engines a minimum time of 30 seconds at 70% N1 is specified for ice shedding, whereas for other manufacturers such as PW and IAE the requirement is only a temporary spool-up to the mentioned N1 value. Is it because of the different design of the low pressure compressor amongst different models?

Thanks for your time!