FANS-1/A and ATN Data Link:FANS-1/A and ATN Data Link:An Avionics PerspectiveAn Avionics Perspective

Bob Kerrbob.kerr@honeywell.com

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AgendaAgenda

• Aviation Data Link Users

• Today’s ATC Data Link: FANS-1/A

• The Next Step: ATN

• System Accommodations

• Lessons Learned

• Conclusion

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Potential Aviation Data Link UsersPotential Aviation Data Link Users

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FANS 1/A Data Link - OverviewFANS 1/A Data Link - Overview

• Augments other ATM functions, e.g. RNP• ATC Communications using existing ACARS data link

infrastructure– Automatic Dependent Surveillance– ATC Data Link - (pilot controller communications)

• Aircraft Equipped (current or available soon)

– Boeing 717, 747-400, 757, 767, 717, MD-90, MD-10, MD-11– Airbus A320 family, A330, A340– Planned for Classic retrofit, Biz Jets, military transports, ...

• Regions– Oceanic and Remote Airspace

• Benefits– Crew workload (replaces routine HF communications)– Dynamic Re-routing– User-preferred Trajectory (available soon)

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Satcom

HF Radio

A429

Analog VHF Radio

A429

Equipment Requirements - FANS-1/A D/LEquipment Requirements - FANS-1/A D/L

FMSA-618,A-622

A-724BACARS MU

MFD

MCDUData Link

Key

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Satcom

HF Radio

A429

A429

FMS

MFD

MCDU

Equipment Requirements - ATNEquipment Requirements - ATN

A-758 CMUATN Router &Applications

A-429

A-750VHF Data Radio

VDL Mode 2

Protocol Update

Data Level 3

ATN Applications

CHI Upgrade

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VDR GrowthVDR Growth

<2000 2000 2001

IncreasedFunctionality

Today’s VHF RadioToday’s VHF RadioMode 0Mode 0

•25 kHz/8.33 kHz•FM Immunity•2400 bps ACARS•MSK Modulation

•Internal Modem•ARINC 429 Buss

to CMU/ATSU

•D8PSK Modulation•Spectrum Mask•31.5 kbps data link

Mode 2 VHF RadioMode 2 VHF Radio

2nd DSPMode A VHF RadioMode A VHF Radio

Modem

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CMU GrowthCMU Growth

•ACARS Messaging•Support for FANS-1

ATC Messages

•ARINC 623 ATC Apps (PDC, OCX, ATIS, etc)

•Uses MCDU or Proprietary CDU

Today’s ACARS MU Today’s ACARS MU or ATSUor ATSU

Today’s Systems 2001 2002 2004 - 2007

IncreasedFunctionality

• ATN Baseline 2 Applications• Dual Operation• Enhanced Security (authentication and encryption)• Network Management

•VDL Mode 2 AOA•ARINC 758 or 724B

•ATN Protocols•ATN Baseline 1 Apps

(CM, ADS, CPDLC)•Data Link CDU

VDL Mode 2 VDL Mode 2 CMUCMU

(ARINC 758)(ARINC 758)

ATN CompliantATN Compliant CMUCMU

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FMC Data Link GrowthFMC Data Link Growth

Today’s Systems 2005 - 2007

IncreasedFunctionality

•ATN Baseline 1 SupportAuto-load route uplinkADS data transmission

•ATN Baseline 2 SupportClearance requestsClearance uplinks

•ACARS Apps (AOC)•FANS 1/A Apps•ARINC 622

Today’s Flight Today’s Flight Management Management Computer Computer

CPDLC Compliant CPDLC Compliant Flight Management Flight Management

Computer Computer

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Integrated Avionics Data Link GrowthIntegrated Avionics Data Link Growth

Today’s Systems 2005 - 2007

IncreasedFunctionality

•ACARS Apps (AOC)•FANS 1/A Apps•ARINC 622

•VDL Mode 2 AOA

•ATN Protocols•ATN Applications

(CM, ADS, CPDLC)

Today’s Integrated Today’s Integrated Avionics ComputerAvionics Computer

e.g. AIMS, EPICe.g. AIMS, EPIC

CPDLC Compliant CPDLC Compliant Integrated Avionics Integrated Avionics

ComputerComputer

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Crew InterfaceCrew Interface

2119Z FROM KZAK CTL

WILCO*

OPENAT ALCOA CLB TO & MAINT FL310

STDBY** UNABLE

< OTHER

DCDU

MCDU

MFD

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Integration ChallengesIntegration Challenges

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System AccommodationsSystem Accommodations

• FANS-1/A and ATN Services will co-exist into the future

• Different communications infrastructure• Different message definitions

– but some mapping is possible

• Operational and Service differences must be minimized

• Accommodation possible on aircraft, ground, or both– Possibility of reduced benefits regionally

• Under analysis in RTCA SC-189/EuroCAE WG-51

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Lessons Learned (1)Lessons Learned (1)

• Programmatic

– Tight configuration management for successful

interoperability

– Close cooperation between the participating ATC Service

Providers is required

– Technology introduction quicker than modifications to

operational procedures

– Operational benefits not as early as planned

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Lessons Learned (2)Lessons Learned (2)

• Human Factors

– Pilot interface must be carefully designed

– Adequate crew training is expensive but mandatory

• Technical

– Compatibility of air and ground navigation data base

– Significant operational benefits accrue from tight interface

with Flight Management System ‘Auto-load’ of Route Clearances, etc.

– High integrity and robust data link infrastructure required

to support ATC data link safety requirements

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ConclusionsConclusions

• FANS-1/A ATC Data Link suitable for oceanic and remote geographic regions into the future

• ATN ATC Data Link is NOT an immediate replacement for FANS-1/A– Supports different airspace needs

– Supports different user mission needs

• Successful ATC Data Link requires tight integration between Communication system and other avionics– CHI : ‘Pilot friendly interface’

– FMC : CPDLC integration with the ‘navigator’

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18ATN 2000 - London - Sept. 2000