3.4 ELECTRONIC MONITORING AND CONTROL SYSTEM ECS OPERATION Level 4: Service / Maintenance / MAINTENANCE CALL - 4 - Maintenance call * REMARK * - 4 - Maintenance call * PERIODIC 250 h MAINTENANCE * - 4 - Maintenance call * PERIODIC 500 h MAINTENANCE * - 4 - Maintenance call * PERIODIC1000 h MAINTENANCE * - 4 - Maintenance call * PERIODIC 2000 h MAINTENANCE * - 4 - Maintenance call * PERIODIC 3000 h MAINTENANCE * - 4 - Maintenance call * INITIAL 250 h MAINTENANCE * - 4 - Maintenance call * INITIAL 1000 h MAINTENANCE * Level 4: Service / Maintenance / ACKNOWLEDGEMENT - 4 - Acknowledgement OPERATE KEY SWITCH - 4 - Acknowledgement QUI 250 h maintenance performed ?
- 4 - Acknowledgement QUI 500 h maintenance performed ? - 4 - Acknowledgement QUI 1000 h maintenance performed ? - 4 - Acknowledgement QUI 2000 h maintenance performed ? - 4 - Acknowledgement QUI 3000 h maintenance performed ? 142