A320 Engines and Green Dot
Hi there, I am looking for enlighted individuals with experience on both CFM and IAE powered A320s.
I have flown with both engine configurations over the past few years, and noticed that green dot is 5 kt higher when IAE engines are fitted. Mind you, until recently, the only IAE powered A320 I operated were of the -232 variants. So for example, CFM GD at 60 tons is 200kt and IAE GD at 60 tons is 205 kt. This GD speed is calculated by the FAC during climb, (GW*2) + 80 on CFMs or +85 on IAEs, or so I presumed.
I have recently operated an A320-231. Looking at the speeds in the manuals as well as the GD in flight, the calculation is based on (GW*2) +80, just as for the CFM.
Is this normal for the A320-231 (IAE -A5 engines) or is there a documentation issue or mix up with other variants?
Thanks in advance for colleagues out there who may help with this.