Alternate CPU recovery (ACR) attempted to remove the last standard CP. There must be at least one standard CP online in order for the system to run.
The system issues wait state code 05A and enters a non-restartable wait state.
Contact the system programmer.
The problem might be due to a hardware or software problem on the last standard CP. If it is a hardware problem, you will need to reconfigure the partition, so that it contains at least 1 standard CP. If it is a software problem, you probably want to take a stand alone dump and then reIPL the system.
Alternate CPU recovery (ACR)
IEAVTACR