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## 3.3 OSA Components 

The OSA components are described in Section 3.3.1 through Section 3.4.3. 

## 3.3.1 OSED 

The OSED describes the service characteristics of the solution concept in an operational environment. This description includes both ground and air elements and must include all elements of the 5M Model (as discussed in the SMS Manual). The OSED is used as a mechanism platform to describe the service provided by the solution, the users of the solution, and the varying operational and environmental considerations in which the service is provided for the related Communication, Navigation, and Surveillance (CNS) and Air Traffic Management (ATM) system. The description provided by the OSED is used as a baseline and solution boundary from which to conduct the safety assessment. 

## 3.3.2 OHA 

The OHA assesses the operational hazards associated with the shortfall described in the OSED. It determines the severity of each hazard so that operational objectives and safety requirements can be identified for any solution that results in an acceptable level of safety risk when deployed. 

## 3.3.3 ASOR 

The operational objectives and safety requirements identified in the OHA form the basis for assessing the safety of any developed solution. For OSAs conducted across multiple domains, the ASOR allocates the safety objectives and requirements to the service level (e.g., Air Traffic Services or Flight Standards Service), develops and validates risk mitigation strategies shared by multiple organizations, and allocates safety requirements to those organizations. For OSAs conducted within a domain or at a distributed level, the ASOR allocates the mitigations and controls to their respective disciplines (e.g., equipment specification, procedure requirements, training, logistics, and maintenance). 

