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- 1. FANS FUTURE AIR NAVIGATION SYSTEM HELLENIC AVIATION SOCIETY MAY 2014 - A340 - 3 : 12-13 2104 A .
2. WHAT IS FANS ? 1. Satellite Technology to manage ATC 2. Space based technology less dependent on ground infrastructure 3. Data link communications based on satellite and GPS networks 3. CURRENT AIR TRAFFIC MANAGEMENT ATC currently is based on ground navigational aids, radar surveillance, and voice communications between Controllers and Flight Crews 4. OPERATOR ADVANTAGES WITH FANS 1. Reduced separation between airplanes 2. More efficient route changes 3. Satellite communication 4. No altitude changes at track crosses 5. More direct routings 5. STATUS OF FANS 1 (1ST STAGE OF IMPLEMENTATION) Airplanes must be equipped with following: 1. Airline operational control datalink (AOC) 2. Automatic Dependent Surveillance (ADS) 3. ATC data link 4. GPS integration 5. Required Navigational Performance (RNP) 6. Required time of Arrival (RTA) 6. AIRLINE OPERATIONAL CONTROL DATA LINK AOC gives the a/c the ability to transmit new routes, position reports and updated winds through the data link network 7. AUTOMATIC DEPENDENT SURVEILLANCE (ADS) The ADS function reports the current flight position via satellite or VHF data link to the air traffic controller or to the airline. This improves surveillance of airplanes en route. Refer to Malaysian MH 370 8. ADS B 9. GLOBAL POSITIONING SYSTEM This improvement provides a more accurate position for en route and approach operations The navigation system must demonstrate that it can meet the required navigational 10. CDTI CDTI Cockpit Display of Traffic Information ACARS : Aircraft communications addressing & reporting system 11. ACARS Aircraft Communication Addressing & Reporting System: AOC messages include take-off and landing confirmation, weather information, gate information, and engine reports. ATC messages include navigation information, aircraft positional reporting, departure clearances, oceanic clearances, runway conditions, and weather data. Currently AOC messages take up 80% of ACARS network traffic versus 20% for ATC, but the FAA NextGen program will shift more and more voice communications to data in the near future 12. FAN INTERFACE 13. TYPICAL FANS ARCHITECTURE 14. REQUIRED NAVIGATIONAL PERFORMANCE (RNP) RNP criteria require accuracy, integrity and availability as set by FANS Actual RNP is constantly monitored If the required navigational performance is exceeded the flight crew is alerted to compensate for the situation 15. REQUIRED TIME OF ARRIVAL (RTA) This gives flight crew the ability to assign a time constraint to a waypoint (or even to destination) allowing the a/c to cross the waypoint at a specific time, plus or minus 30 sec. That helps managing crossing traffic. If RTA is not available crew should be alerted 16. FANS BENEFITS Because use of FANS permits more ATC space to be used through more accurate a/c surveillance, operators have the following benefits: Reduced fuel consumption, increased payload and cargo, more efficient route changes, more direct routes, no altitude changes at crossings and real time updated weather conditions 17. WHAT ABOUT VOICE COMMUNICATIONS With FANS technology ADS-C has really substituted the Transponder mode S. With the high accuracy surveillance it has also made radar environment redundant But the controller still needs to give clearances and vectoring as well as altitude changes to flight crews 18. CPDLC CPDLC stands for Controller Pilot Data Link Communication It is a series of text messages exchanged between ATC and flight crew in a form similar to mobile SMS texts They use standard operational phraseology 19. CPDLC The pilots use the MCDU screen to receive and respond on ATC text messages The procedure is not affected by language and pronunciation differences, or by blocked VHF transmissions All clearances are given in short clear text messages and are responded similarly 20. CPDLC The whole procedure is especially useful in oceanic environment where, in the past, noisy and inefficient HF communications where used, due to the long distances involved CPDLC is already used in Oceanic crossings where distances of the a/c from the VHF ground transmitters is in excess of 400 NM 21. CPDLC 22. SO WHAT IS REALLY FANS FANS is made of two major renovations: ADS-B (Automatic Dependent Surveillance- Broadcast) CPDLC (Controller Pilot Data Link Communication) Note that ADS-B has been modified to ADS- C (Automatic Dependent Surveillance- Contract) 23. SO WHAT IS REALLY FANS ADS-C will eventually substitute completely Transponders and Radars. CPDLC will eventually substitute HF and VHF air to ground communications The traditional voice communication and a/c surveillance by radar may be kept only as back up systems 24. WHAT ABOUT EMERGENCIES Mayday and PAN PAN functions will remain with voice communication Flight recorders will be modified to recognize and store all satellite data link exchanged between ground stations and a/c 25. A380 FANS 26.