ARINC653P4 653P4 Avionics Application Software Standard Interface, Part 4, Subset Services

ARINC Specification 653 Part 4 was prepared to support controllers and relatively simple avionics. Part 4 is true subset of services specified in ARINC 653 Part 1. In the Subset Services, partition scheduling is restricted to only one partition time window within the partitions period. This simplifies the management of process release points. Process management uses a dual-process model with at most two processes within a partition, for example, foreground and background.

*Note: Part 4 services are a subset of the services defined by 653P1. Readers of this document should be fully acquainted with the content of ARINC 653P1.