About the EMA
The En-route Monitoring Agency (EMA) is a part of the JASMA, was established and operated by Japan Civil Aviation Bureau (JCAB), to perform the safety application of Performance-based Horizontal Separation Minima (PBHSM) for both lateral and longitudinal separation in Fukuoka Flight Information Region (FIR).
The purpose of an EMA is to evaluate airspace safety before implementation
of PBHSM and to continue safety monitoring after implementation.
Within the Asia/Pacific Region, the Asia/Pacific Air Navigation Planning
and Implementation Regional Group (APANPIRG) is responsible for approving
the establishment of an EMA through the Regional Airspace Safety Monitoring
Advisory Group (RASMAG). Japan has been approved as the EMA for international
airspace in the Fukuoka FIR.
The JASMA covers international, and oceanic airspace, for lateral and longitudinal
separation between aircraft flying by RNAV10 (RNP10) or RNP4.
Function-1: Safety Administration
To establish and maintain a database of PBN and PBCS approvals
To monitor horizontal-plane navigation performance
- Core Navigational Performance
- The occurrence of Large Lateral Deviation (LLD) and Large Longitudinal
Function-2: Safety Analysis
To conduct safety assessment and reporting results
- Safety Assessment
- Establish the Competence Necessary to Conduct a Safety Assessment
- Assembling a sample of traffic movements from the airspace
- Process for Determining Whether the TLS is satisfied as the results of
a Safety Assessment
To monitor operators' compliance with state approval requirements