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A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
INFORMATION SYSTEM
CNS/ATM
A330/A340 FLEET DSC-46-40 P 6/10
FCOM 19 AUG 10
The RECALL function key can be used to display the last closed message.
Other messages can be reviewed from the MCDU MSG LOG page.
To allow some delay in answering, the pilot may answer STBY. In this case, the message cannot
be removed until the final answer is sent, within an expected short period of time (around 10 min).
The FMGS monitors most of the deferred clearances and automatically recalls messages, when
applicable. This is indicated by the “MONITORING” signal on the lower part of the DCDU, which
comes on in white.
Route clearances and time constraints, received on the ATSU, can be loaded into the FMGS
(SEC F-PLN) by using the LOAD key on the DCDU. The result of the loading (e.g. LOAD OK
or LOAD PARTIAL) is displayed on the DCDU. Report requests are sent to the FMGS, which
monitors the related parameters (e.g. report passing...). In this case, and when applicable, the
FMGS automatically proposes an answer (i.e. : when passing the waypoint at which the report is
requested).
DOWNLINK MESSAGES (FROM THE CREW TO THE ATC)
All downlink messages must be displayed on the DCDU prior to being sent. This allows the crew to
visualize the exact message (concatenated) that will be displayed on the controller screen.
The following message categories can be downlinked :
1. Answers to ATC messages by using the DCDU function keys (WILCO, UNABLE, AFFIRM...).
2. Clearance requests (vertical, lateral, speed).
3. Reports (reports when a specific condition is met, position reports upon ATC request or at
waypoint sequencing, immediate confirm).
4. Negotiation requests (When can we expect ...?)
5. Emergency messages (PAN PAN PAN, MAYDAY MAYDAY MAYDAY)
6. Additional messages.
All messages, not in direct response to an ATC uplink message, are prepared on the MCDU prior
to appearing on the DCDU for review before sending.
Clearance requests are prepared on the MCDU ATC MENU page (prompts VERT REQ. LAT REQ
and OTHER REQ). Then, they are displayed on the DCDU using the MCDU’s REQ DISPL prompt.
Most report messages are automatically proposed by the FMGS on the DCDU.
They can be modified, if required, using the MODIFY key which calls for the MCDU’s MESSAGE
MODIFY or POSITION REPORT page. The MODIFY key also enables the updating of FMGS
parameters on the DCDU.
The crew may prepare emergency messages on the MCDU by using the EMERGENCY page.
These messages are then sent to the DCDU by using the EMERG DISPL prompt on the MCDU.
The crew must then send the DCDU-displayed messages by using the SEND key.
The message may be removed from the screen by using the CLOSE key.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
INFORMATION SYSTEM
CNS/ATM
A330/A340 FLEET DSC-46-40 P 7/10
FCOM 19 AUG 10
CONTROLLER PILOT DATA LINK COMMUNICATIONS (CPLDC)
Applicable to: ,
CPLDC involves the exchange of preformatted or free text messages.
All ATC messages, either coming from the ATC center (uplink) or to be sent to the ATC center
(downlink), transit through the DCDU.
UPLINK MESSAGES (FROM THE ATC TO THE CREW)
The following message categories can be uplinked :
1. Clearances (immediate or deferred, speed, heading, altitude, offset, direct to, route clearance or
constraint etc...)
2. Report requests (confirm, position reports...)
3. Negotiation requests (ex : Can you accept ... ?)
4. Information messages.
Upon message reception, the ATSU triggers the ATC chime and the flashing blue “ATC MSG”
pushbutton light on the glare shield.
For normal messages, the aural signal is repeated every 15 s (with the first signal delayed by
15 s). For urgent messages, the aural signal is triggered without any delay and is repeated every
5 s.
If the screen is empty, the message appears on the DCDU. If not, a flashing “MSG 1/2” cue is
displayed.
The pilot can display the message by using the MSG + pushbutton.
Note: Urgent messages are displayed, regardless of the state of the screen.
Push one of the two “ATC MSG” pushbuttons to stop the alert. The alert can also be stopped,
when the pilot performs any action regarding the latter uplink message displayed on the DCDU.
To answer the message :
Manually prepare the message by selecting the appropriate ‐ function key (WILCO, ROGER,
AFFIRM, NEGATIVE...), or automatically prepare the message via the FMGS.
‐ Send the message to the ground by using the SEND key.
Once the message is sent, the screen should be cleared by pressing the CLOSE key.
　
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