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The RECALL function key can be used to display the last closed message.
Other messages can be reviewed from the MCDU MSG RECORD 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.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
INFORMATION SYSTEM
CNS/ATM
A330/A340 FLEET DSC-46-40 P 8/10
FCOM 19 AUG 10
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.
AUTOMATIC DEPENDENT SURVEILLANCE (ADS)
Applicable to: ,
There are three states of the Automatic Dependent Surveillance (ADS) function : “ARMED”,
“CONNECTED” or “OFF”. They can be checked on the CONNECTION STATUS page.
The ADS function is normally armed. As long as the ADS is armed, up to 5 ATC/AOC centers
can connect themselves. Connection is at the ATC’s discretion, and some centers do not use this
function.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
INFORMATION SYSTEM
CNS/ATM
A330/A340 FLEET DSC-46-40 P 9/10
FCOM 19 AUG 10
As soon as one ADS center is connected, the ADS status changes from “ARMED” to
“CONNECTED”.
The ATSU sends surveillance data to the connected ATC centers. The ATC defines the content
and frequency of the reports sent by the ATSU, in order to satisfy operational needs. This activity is
automatic and transparent to the crew.
However, the crew can disconnect from the connected ATC/AOC centers on the ADS DETAIL page,
via the CONNECTION STATUS page.
The ADS function can be set to off on the CONNECTION STATUS page.
AUTOMATIC DEPENDENT SURVEILLANCE (ADS)
Applicable to:
The Automatic Dependent Surveillance (ADS) function is normally armed. However, the crew can
select it off on the CONNECTION STATUS page.
As long as the ADS is armed, up to 4 ATC centers can connect themselves. Connection is at the
ATC’s discretion, and some centers do not use this function.
The ATSU sends surveillance data to the connected ATC centers. The ATC defines the content
and frequency of the reports sent by the ATSU, in order to satisfy operational needs. This activity is
automatic and transparent to the crew.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
INFORMATION SYSTEM
CNS/ATM
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