Presented By: Dennis Addison, FAA Date: February 8, 2012

Federal AviationAdministration

Presented By: Dennis Addison, FAADate: February 8, 2012

SOCM-2 SeminarData Link Benefits

Federal AviationAdministration

SOCM-2February 8-10, 2012

Satellite Data Link Benefits• Aircraft message exchange time is reduced.

– FAA HFRO clearances must be delivered within 3 minutes.– Actual Communication Performance (ACP)

• Total time required by the communication transaction• Begins when the CPDLC uplink message is sent to aircraft• Ends when the WILCO is received

Federal AviationAdministration

SOCM-2February 8-10, 2012

Satellite Data Link Benefits• Data Link communications provides a direct

link to the aircraft.• Third Party HF Radio relays are removed.

– Safety is increased when messages are not repeated by a third party.

– Errors can occur each time a message is verbally repeated.

Federal AviationAdministration

SOCM-2February 8-10, 2012

Satellite Data Link Benefits

• More frequent and accurate position reports are received via ADS-C.

• ADS-C contract rate can be increased in emergency situations.

• Event contracts alert ATC when aircraft are deviating from their cleared profile.

Federal AviationAdministration

SOCM-2February 8-10, 2012

Satellite Data Link Benefits• CPDLC clearances use a clearly defined

digital message set.

• The standardized clearance message set reduces the chance of misinterpretation.

• Readback/Hearback errors are removed.

• Route clearances load directly into the FMS.

Federal AviationAdministration

SOCM-2February 8-10, 2012

200 Miles

60 Miles

Longitudinal Separation

Lateral Separation

10 Mins (~80 Miles)

30 Miles 30 Miles 30 Miles

Satellite Data Link Benefits• Oceanic Separation Standards are reduced.

Federal AviationAdministration

SOCM-2February 8-10, 2012

Satellite Data Link Benefits• Satellite Data Link Communications are

more reliable than HF communications.

– HF Communications Atmospheric Conditions.

– Solar Flares

– Multiple ATC Facilities use the same frequency

Federal AviationAdministration

SOCM-2February 8-10, 2012

Satellite Data Link Benefits

• Satellite Data Link reduces HF congestion.

• When traffic levels are high, aircraft may have to wait to transmit their messages.

• FANS equipped aircraft do not compete for band width on the HF frequencies under normal conditions.

Federal AviationAdministration

SOCM-2February 8-10, 2012

Satellite Data Link Benefits• Satellite Data Link makes more advanced

procedure possible.– Dynamic Airborne Reroute Procedure (DARP)

• Allows Airborne Aircraft to obtain a new more efficient route.

– Tailored Arrivals• This procedure uplinks an Optimized Profile Descent to the

aircraft FMS.

– ADS-C CDP• This procedure allows a controller to Climb/Descend

another aircraft through the altitude of a blocking aircraft.

Federal AviationAdministration

SOCM-2February 8-10, 2012