Controller Display

• Displays RVR values and trends at touchdown, mid-point and roll-out
• RVR values are displayed in conformance with FAA and ICAO recommended ranges in both feet and meters
• Indicates center and edge light intensity settings in 5 increments
• Simultaneous data display for up to three runways with runway designations
• Visual and audio indication of low visibility threshold alerts
• Alarm indication of center and edge light setting mismatch
• Display is readable at over 10 ft (3m) distance in light levels from direct sunlight to near darkness
• Display is readable at ±30° horizontal and ±20° vertical angles
• Dual communication data channel utilization for reliable data transmission
• Can be accessed via remote modem connection
• Utilizes back-lit dichroic liquid crystal display to assure readability under all light conditions
• Built-in self-test to assess operational readiness

• Measurement range from 0.5 F-L to > 12,000 F-L
• Measures ambient light to an accuracy of ±10%
• Resolution is 0.1 F-L or 10% of reading
• Time constant is less than 30 seconds
• Operates in all ambient light conditions
• Remote maintenance monitoring improves MTTR
• Built-in window and hood heaters prevent condensation on sensor optics for improved data reliability
• Built-in sensor window contamination monitoring and compensation reduces periodic maintenance
• Internal status and failure monitoring reduces fault isolation time

• Computes up to 18 RVR values simultaneously corresponding to 6 physical or 12 logical runways
• Computes visual range, trend, and runway light settings for each runway
• Archives data in non-volatile memory for later reporting: RVR values every minute for last 15 minutes, every 5 minutes for last hour, and every hour for last 15 days - Raw data for 30 seconds
• Operator initiated incident observation archiving
• Maintenance data integrity assured by separate dedicated built-in maintenance processor
• Minimum maintenance time achieved through remote fault isolation to card level
• Supports: -18 Visibility sensors -1 Ambient light sensor -12 Runway light intensity monitoring sensors -26 Displays
• Support interfaces for 1 Maintenance data terminal and 3 External users
• RVR data reliability is achieved through sensor data quality checks, communication error checks, use of FAA proven RVR computation algorithms, and equipment status monitoring

• Measures center and edge light current regulator output in range of 0-25 amperes
• The accuracy of measurement is 6% of reading or 0.1 amperes, whichever is greater
• Sensor time constant is 1 second
• Compatible with 6.6 and 20 amperes current regulators
• Up to four sensors per runway light intensity monitor SIE
• Split core transformer implementation eliminates need to cut power cables for installation
• Maintenance free operation

• Measures the atmospheric extinction coefficient over an extinction coefficient range of 1.5/km to 500/km
• Accuracy is ±20% RMSE from 1km to 10km and ±15% RMSE from 10km to 1100km (90% confidence level)
• Time constant is less than 10 seconds
• Sensitivity is not affected by rapid change of ambient light
• Forward scatter-based measurement method assures low maintenance and reliable operation
• Automated sensor calibration reduces set up time
• Built-in window and de-icing heaters prevent condensation on sensor optics for improved data reliability
• Built-in sensor window contamination monitoring and compensation reduces periodic maintenance
• Internal status and failure monitoring reduces fault isolation time
• Lookdown geometry assures reliable operation under severe weather conditions (blowing rain/snow)

• Converts sensor outputs to digital format
• Samples sensor outputs at 2-second interval
• Transmits digitized sensor data and maintenance information to DPU
• Implements 300-baud half-duplex communication protocol
• Reliable DPU/SIE communication with up to 5 miles (8km) of 19 AVG twisted pair cable
• 4-hour battery backup sustains operation during temporary power outages
• All three sensors utilize a common basic electronic interface, simplifying maintenance and reducing spares
• A personality module adopts the interface to one of the three types of sensors
• Simple communication link using built-in modem
• Supplies power to sensors
• Incorporates built-in-test to deliver status and failure information to remote monitoring system