Hello Guys,
Yesterday for the first time I flew an A321 Neo equipped with DPO. And something bugged me. When we were in Idle descent using managed descent. FMA was saying « Thrust Idle » but not on the EWD.. Then I just pull Open Descent and the engines lost about 2% N1 and went finally really to Idle. Honestly it looks like they just reduced slightly the idle thrust versus Airbus Without DPO but I thought the idle should have been exactly the same as Open Descent as the FCOM states:
« With DPO, along the idle segment, without altitude constraint, the descent profile computed by the FMS is the same as the one flown in OPEN DES mode. Therefore, reverting in OPEN DES mode during the descent does not change the descent rate. »