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Transcript of CPDLC Overview
< ATC INDEX
The final episode of M.A.S.H. airs to 125 million viewers.
O.J. Simpson acquitted of murder.
Dolly the sheep cloned.
Air France 4590 (Concorde) crashes after takeoff in Paris.
The Lord of The Rings wins 11 Oscars.
European LINK2000+ CPDLC (ATN) services begin.
Final European ANSPs implement SC214 systems.
RTCA SC214/ EUROCAE WG78 commence work on new ATN standards.
SC214/WG78 Standards published.
"Convergence" crowned the new FANS/ATN buzz word.
Committee considers proposal to decommission FANS-1/A systems.
New government blames the economic situation on the previous administration.
The "Great Divergence Period" begins...
"CPDLC allows the exchange of text-based messages between suitably equipped Air Traffic Control (ATC) ground systems and cockpit displays".
KLAX - YSSY, June 1995
FANS-1/A Certification Flight
Initial need - Oceanic Communications
Most regional ANSPs employed a third-party HF radio operator, which meant that each transaction could take several minutes, and...
As a result, oceanic separation standards were...
DCPC via CPDLC allowed for the introduction of 50NM/50NM separation standards.
ATC communications with
However, unlike phone texts,
most CPDLC messages
- are pre-defined,
- selected from a menu,
- and just require a...
Each CPDLC message can consist of up to
Each message element is assigned...
- A unique message number
- A response attribute
- A Message ID Number (MIN)
CLIMB TO FL370
UM20 W/U 17 
DM0 N 33
Used by the receiving system to decode message text.
Defines the type of response required, if any.
The next number in the initiating system's ID sequence (0-63).
Logged-on and connected,
CPDLC requires the aircraft to logon to the ground system.
Subsequent transfers are performed automatically by the ground systems.
atc data link news
The first logon is performed manually by the pilot.
selected message elements, including free text.
ATC system ICAO code
Up to 15 minutes
Until CPDLC was developed,
HF Radio was the only means of
controllers did not have direct communications with aircraft under their control.
10 FEB 2012
FANS-1/A System Network - ACARS
Current Data Authority (CDA)
Next Data Authority (NDA)
Airbus FANS-A certified over ACARS.
ICAO - FANS Special Commitee defines ATN, CPDLC, ADS-C.
Boeing FANS-1 certified over ACARS.
CPDLC services commence in the South Pacific Region.
The "Great Convergence Period" begins...
1983 - 2030
The What >
The When >
The Why >
The How >
A single message containing multiple elements uses the highest priority overall attribute of all the elements.
ATC Data Link News: http://members.optusnet.com.au/~cjr/introduction.htm
Direct Controller Pilot Communications
Up to 15 minutes