Flight Crew Air Transport Pilot (ATP)
Human-Machine Interface; Time Pressure; Workload
Other unwanted situation
Chart Or Publication; Procedure; Human Factors; Aircraft
The IVANE TWO RNAV ARRIVAL is an accident waiting to happen. The A321 CANNOT MAKE THE RESTRICTIONS and results in excessive workload and task saturation.The Airbus 321; using the auto flight system in Managed Mode; CANNOT MAKE THE RESTRICTIONS ON THE IVANE TWO RNAV ARRIVAL! Example: AMOBE to PELOY is 5.3 mi. The A321 CANNOT descend 1000 FT and slow from 250 to 210 KTS in 5.3 mi!!! IT CAN'T BE DONE in Managed mode; especially if there is a tailwind. The only way to comply with this restriction is to come out of managed speed; select a slower speed approaching AMOBE and then use FULL SPEEDBRAKES and extend flaps to make the restiction at PELOY. This is a poorly designed STAR -- no wonder there are so many problems with it.Get rid of it.
An A321 Captain expressed his displeasure with the demands of the IVANE RNAV STAR to CLT; citing the inability of the autoflight system to comply with crossing restrictions in Managed Descent mode.