Originally Posted by
tdracer
Where those 'FADEC' engines? Because after a rapid thrust lever movement, FADEC accelerates (or decelerates) at a "N2 Dot" (or occasionally N1 Dot) schedule - i.e. the FADEC supplies the amount of fuel needed for the N2 (or N1) rotor to accelerate at the target speed. Coming off idle, there can be some other issues that come into play that can affect the engine accel rates (hence the 50% stabilized bit), but above that it would take an extremely unhealthy engine to not accel at the N2/N1 Dot schedule above 50% N1.
Pre-FADEC were governed differently - and various tolerances in the fuel control and engine to engine differences could dramatically affect the accel rates. FADEC pretty much did away with that - and unlike the 737 - the A320 never had non-FADEC engines.
Yes, regular CFM engines on the A320. The FADEC does what it needs to on its own engine. There's no differential thrust protection function that compares thrust between engines, so from time to time you do see one engine taking 2 or 3 seconds longer to spool up. Can be unnerving if caught off guard, esp for the inexperienced guys