1. Oceanic and International Operations
Performance-Based Requirements

2. Objectives At the end of this lesson, you will be able to:
Identify performance-based Communication, Navigation, and Surveillance (CNS) requirements
Identify ICAO guidance related to performance-based Communication, Navigation, and Surveillance (CNS) requirements

3. Overview In this lesson we will discuss the following topics:
Performance-based CNS requirements
CNS requirements
Related ICAO guidance

4. Performance-Based CNS Requirements
Performance-based, in this context, refers to the required performance to meet the criteria of the communications, navigation, and surveillance requirements
Performance-based criteria include:
Integrity
Reliability
Availability
Continuity

5. Performance-Based CNS Requirements
Performance-based criteria terms specific to RCP and RSP include:
Operational communication transaction: Is the process a human uses to initiate the transmission of an instruction, clearance, flight information, and/or request, and is complete when that human is confident that the transaction is complete
Required Communication Performance (RCP) Integrity (I): Is the required probability that an operational communication transaction is completed with no undetected errors

6. Performance-Based CNS Requirements
RCP Availability (A): Is the required probability that an operational communication transaction can be initiated when needed
RCP Continuity (C): Is the required probability that an operational communication transaction can be completed within the communication transaction time, either ET or TT 95%, given that the service was available at the start of the transaction

7. communication transaction time
RCP 240
99.9% ≤ 240 sec
95% ≤ 210 sec
Clearance
acknowledgement
received
Intervention
clearance
issued
Monitored operational performance (TRN). The portion of the transaction time (used for intervention) that does not include the times for message composition or recognition of the operational response.
RCTP. The symbol used to designate required communication technical performance.
Controller /
HMI
ATSU
System
CSP
System
Aircraft
System
Flight Crew /
HMI
Aircraft
System
CSP
System
ATSU
System
Controller /
HMI
Controller
confident
transaction
complete
RCTP – Required Communication Technical Performance
PORT – Pilot Operational Response Time
TRN – Monitored Operational Performance
RCP Type
communication transaction time

8. Performance-Based CNS Requirements
Surveillance Data: Is data pertaining to the identification of aircraft and/or obstructions for route conformance monitoring and safe and efficient conduct of flight
Surveillance availability (A): Is the required probability that surveillance data can be provided when needed
Surveillance continuity (C): Is the required probability that surveillance data can be delivered within the surveillance delivery time parameter, either OT or DT 95%, given that the service was available at the start of delivery

9. Performance-Based CNS Requirements
Accuracy: Estimated vs. measured position. Radio navigation performance accuracy is usually presented as a statistical measure of system error and is specified as:
Predictable
Repeatable
Relative

10. Q&A
What are some examples of each of the following requirements for oceanic operations?
Communication
Navigation
Surveillance

11. CNS Requirements C N S VHF and HF radios (either Voice or Datalink)
SATCOM Data Link
For example, CPDLC Controller Pilot Datalink Communications
SATCOM Voice N
NAT MNPS (NAV accuracy requirement)
RNP
RNAV S
ADS-C (Automatic Dependent Surveillance-Contract)
ADS-B (Automatic Dependent Surveillance-Broadcast)
Voice position reports

12. Related ICAO Guidance
ICAO Performance-based Navigation (PBN) Manual (Doc 9613 TOC) (as amended)
This ICAO document is specific to performance-based navigation requirements
Other ICAO documents are evolving for specific performance-based communication and surveillance requirements

13. Review In this lesson we discussed the following topics:
Performance-based CNS requirements
CNS requirements
Related ICAO guidance

14. Objectives You should now be able to:
Identify performance-based Communication, Navigation, and Surveillance (CNS) requirements
Identify ICAO guidance related to performance-based Communication, Navigation, and Surveillance (CNS) requirements