operations. in this module, you will logon to an atc facility, and look at procedures while you are...

CPDLC / ADS

Operations

Agenda

In this module, you will logon to an ATC facility, and look at procedures while you are connected.

1. Logon – Establish the Connection1. Logon – Establish the Connection

2. Procedures during CPDLC Operations2. Procedures during CPDLC Operations

3. Contingency Operations3. Contingency Operations

Required AuthorizationCPDLC requires Ops spec approval

Data link communications with ATC require operations specifications approval.

Pre-flight

Preflight procedures include NOTAM reviews for planned and predicted outages affecting CPDLC.

Pre-flight ATC Logon

You can log-on during pre-flight on the ground. If the logon is to occur preflight, it can usually be initiated up to 30 minutes prior to departure. You may have to take-off with the “ACCEPTED” message at some locations. In this lesson, we won’t logon during pre-flight.

At some locations the flight plan does not become active in the ATC system until the aircraft departs. When logging on at these particular locations, the ATC COMM ESTABLISHED message does not appear until after departure and the logon process halts after the ACCEPTED message appears. If this situation is known to exist, the logon process may be initiated at around 10,000 feet during climb out.

CPDLC/ADS Operations

You’ve taken off and are approaching a CPDLC area, so let’s get started.

Just tell me which one to push

There sure are a lot of buttons

Check Logon Procedures

The local AIP or regional data link documentation should be checked for any specific ATC logon procedures for the location. For example, some airports close to an FIR boundary may require the logon to occur to different ATC Centers depending on the direction of the flight and whether the logon occurs prior to or after departure.

If no specific instructions exist for a given CPDLC area, then the logon should generally be performed between 15 and 45 minutes prior to entering the CPDLC airspace.

Finding the ICAO FIR Identifiers

The four-character ICAO FIR identifier for an ATC Center is listed on the appropriate Jeppeson chart.

Enter the Logon information

You push the ATC key, and enter the Logon information. Once all three fields are filled in, the send prompt appears on the right side of the page.

Normally, enter N767A in both the FLT NO and TAIL NO fields

Note the FLT NO automatically inserts the information from the FLT NO entered on the Route Page during pre-flight.

Sending the Logon

When the ground system responds to the logon, the ACCEPTED indication appears. You still are not logged in though (No CPDLC connection exists). Once ACCEPTED the connection should happen automatically though.

Completing the Logon process

Note: At this point ensure that the flight number and the active center are both correct.

If one or both are incorrect, then the key adjacent to "ATC COMM SELECT OFF" should be pressed to terminate the connection and the logon process recommenced.

This completion with the ground station should happen automatically with most ATS systems.

Oops

Disconnecting & Re-logon

Since that last logon was not to our liking, first we select off the ATC COMM to disconnect. Then we re-enter the logon information and send it again.

EGGX

Wait for Datalink established

This is looking good now.

Alert message

The EICAS comm message indicates that there is an ATC message on the CDU scratchpad

Mission Accomplished

Select the ATC key to verify connection to the correct center.

Check for ADS – C connection

Ensure that ADS indicates active (ACT). This means position reports are being sent automatically to the ATC facility. If it is not active, you need to manually send the report to ATC, or make position reports via HF.

Setting the Message Latency Timer

If the ATC Service Provider requires the use of the message latency timer (usually only in domestic airspace operations) then shortly after the logon has been completed the ground system will send a free text uplink with the required timer interval for you to enter into the Latency Timer field.

Example: Gander radio, N767A C-P-D-L-C, Shanwick next request SELCAL check EQDF.

Example: Gander radio, N767A C-P-D-L-C, SCROD VALIE, request SELCAL check EQDF.

Initial Voice (VHF) Check-in with ATC

A reference manual titled “Guidance Material for ATS Data Link Services in North Atlantic Airspace”, located in the aircraft library, containsphraseology for initial radio contact. Note this information is in the Guidance Material for ATS Data link Services in North Atlantic Airspace.

Data Link Terms

State A-D-S when only ADS (automatic) waypoint reporting is active

State F-M-C when connected to ATC with data link only

State C-P-D-L-C when connected to ATC with both ADS and data link.

There are three levels of Data link; ADS (automatic) waypoint reporting only, data link connection only and both data link connection and automatic waypoint reporting. You need to advise ATC on initial check-in, what level of data-link currently is in use. Let’s look at how to tell which is appropriate.

Identifying Data Link Status

You use the two LOGIN / STATUS pages to determine which level of data link to report to ATC.

CPDLC

FMC

WPT

It’s all working

Send/Receive data messages, need to also manually send ATC position report as required

No data messages available, position reporting automatic

Non-Flight plan Waypoints

When ADS-C is active, do not insert extra waypoints in the FMC for the ADS portion of the flight.

Updating a Waypoint Estimate

When it is necessary to update a waypoint ETA you can send a free text message in the form of: Revised ETA [position] [time].

Crossing waypoint Send Position Report

Send ACARS (Company) report. Recall that if ADS is not active, then Send ATC report also. Don’t forget to log the 10 minute position check also.

Approaching FIR boundary

The next center should appear automatically.

Data Authority

CPDLC uses the concept of Data Authority. There can only be two Data Authorities (maximum of two ATS units) connected to the aircraft for CPDLC at any one time, with only one of these connections (Current Data Authority) being active.

Unlike Automatic Dependent Surveillance (ADS), CPDLC requires flightcrew interaction.

You must be aware of which ATS unit has the active connection and also the hand-off from one ATS unit to another. Workload and integration with other tasks will be critical to situational awareness.

Gander Oceanic Area Control Centre Operations Building

Crossing FIR Boundary

Ensure that the next FIR becomes active. If it does not, then re-logon.

Receiving Data link Message

If you receive a message from ATC, then open the status page and read the message. Remember to Accept , Reject or Standby any open message.

Data link message accepted

The message is no longer Open.

ATC Log

Check the ATC log for message history as required.

ATC Connection Loss

If the data link connection with ATC is terminated for any reason an ATC COMM TERMINATED message appears in the scratchpad.

Notify the controller of the lost connection using voice communications and then send a new logon request.

Data Link Connection Failure

If the data link connection is lost as a result of losing the VHF and SATCOM communication links, a DATALINK LOST message appears on EICAS.

Note: At this point, the ATC data link connection is still active. Any downlinks will be sent when the connection is automatically restored.

Data Link Non-Normal Conditions Summary

The system has lost communication(SATCOM or VHF) (Datalink temporarily lost)

Equipment failures such as the ACARS computer (Datalink system failed)

There are two EICAS messages associated with the data link system. In either case, the data link is not in contact with the ground station and you will be disconnected (ATC COM TERMINATED) if transmissions fail to resume within 16 minutes.

You Just Lost Cabin Pressure

You have just experience a rapid decompression. You decide the most expeditious method to notify ATC is through CPDLC.

Complete 2 Pages Before Sending

Generate the report by selecting the appropriate conditions then select verify

Verify information, add free text (as req.) and send

Only the conditions you select appear in the verify emergency page. If you enter souls on board, then the fuel remaining appears. Recall, if you send Mayday, then the ADS also goes into emergency mode. Selecting PAN does not put the ADS into emergency mode.

Create Emergency Report

You are descending to 14,000 ft. We have 19 SOB and want to declare and emergency. Note when the airplane altitude is more than 150 ft above the entered altitude, then descending appears in the verify page. After making the selections, we push Verify.

We push buttons 1L, 4L, 2R and then 6R to go to verify it is what we want

Verify, Add to and Declare the Emergency

Here you check the selections before sending. We can also add a free text message describing the emergency. When it looks good, we send it.

Controller Response

CPDLC Voice

The controller will acknowledge an emergency report by the most appropriate means (CPDLC or by voice contact).

Roger MayDay

Contingency Summary

You can review the material in the reference manual titled “Guidance Material for ATS Data Link Services in North Atlantic Airspace”.

Exiting CPDLC airspace

Finally, when you leave CPDLC airspace, you will see the ATC COMM TERMINATED message.

You are over the North Atlantic and you get the ATC COMM TERMINATED message. What is the best course

of action?

Revert to voice communications and notify ATC of the situation and send a new logon request

Try another facility

Wait until the next facility is active

Exit RVSM airspace

Select the best answer

If the EICAS DATALINK LOST message appears, then you must always re-logon to the ATC center after the datalink is restored.

True

False

Select the correct answer

How can you put the ADS into emergency mode?

Select MAYDAY on the emergency report page

Select ADS EMERG “ON” (button 2R) on the LOGON/STATUS page 2

Select PAN on the emergency report page

A and B are both correct

Select the best answer

You have ATC comm established with Gander and ADS is active. Select the best phrase for initial contact with Gander

approaching coast out.

Gander radio, N767A FL__ F-M-C, Shanwick next request SELCAL check EQDF

Gander radio, N767A FL __ C-P-D-L-C, Shanwick next request SELCAL check EQDF

Gander radio, N767A FL __, request SELCAL check EQDF

Gander radio, N767A FL __ A-D-S, Shanwick next request SELCAL check EQDF

Select the best answer

Mission CPDLC Complete