Originally Posted by
balaton
1. Could anyone please explain why the CL604 doesn't have a flex/reduced/derated takeoff possibility?
Because no-one has asked for it. It exists on the CRJ-100/200, so there's no technical reason I'm aware of that would prevent it. I'm sure someone would quote you a price if you inquired.
Originally Posted by
balaton
2. The CL604's CF34-3B engines has a normal takeoff (APR not activated) ITT limit of 884 C for the last 3 min out of 5 per the AFM. However, the max cont (MCT) ITT limit is 900 C. So, the MCT is ITT is higher than the T/O ?? Any explanation to this phenomena?
I believe the answer is in your own question - those are the APR off ITT limits, and with APR
on the limits are 928C for two minutes then 900C for 3 minutes. Since you don't know when APR will kick in, your APR armed but off ITT has to have margin for the APR to work in.
If you check the N1/N2 limits you'll see those tell a similar story - MCT N1 is 98.6%, while Normal Takeoff is 96.2% - but Max Takoff (i.e. with APR) is 98.6%, the same as MCT.