PART 5......................................................................................................................................................................... 5-1 5. MONITORING OF AIRCRAFT SYSTEMS PERFORMANCE .................................................................. 5-1 5.1 The Monitoring Process ................................................................................................................................5-1 5.2 Monitoring Navigation Capability Monitoring by the Operators ........................................................................................................................5-1 5.3 Monitoring of the Operator by the State 5.4 Direct Action by ATS Provider States in the Monitoring Process ................................................................5-2 5.5 Monitoring of Gross Navigation Errors 5.6 Monitoring of Height-Keeping Performance Monitoring of Operational Heigh- keeping Performance Monitoring of Technical Height-keeping Performance ................................................................................5-3 5.7 Monitoring of ACAS II Performance ............................................................................................................5-4 5.8 Overall Navigation (and Systems) Performance 5.9 Tactical Monitoring of MNPS and RVSM Approvals ..................................................................................5-4 5.10 Operational Error Reporting and Central Monitoring Agency (CMA) Activities .........................................5-4 Background ...................................................................................................................................................5-4 Responsibilities .............................................................................................................................................5-5 Follow-up Action on Observed and Reported GNEs ....................................................................................5-5 Further Followup Action by the Operator and/or State of Registry ............................................................5-6 Follow-up Action on Observed and Reported Altitude Deviations ...............................................................5-6 Other Reports to the CMA.............................................................................................................................5-7 Reporting Format