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A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - ACARS INTERFACE
PRELIMINARY PAGES - TABLE OF CONTENTS
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FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - ACARS INTERFACE
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FCOM 19 AUG 10
GENERAL
Applicable to: ALL
The FMS ACARS function gives an interface between a ground station and one onboard FMGC,
allowing data transmission between these two computers via the ACARS Management Unit.
Two different sets of message can be exchanged :
UPLINK messages from the ground station. They consist in reception of data requested or directly
sent to the crew.
DOWNLINK messages from the FMGC (master). They consist in reports or requests sent to the
ground station.
The FMGS/ACARS interface enables the following ACARS capabilities.
‐ F-PLN initialization (flight plan and performance data)
‐ Takeoff data
‐ Wind data
‐ Flight reports
‐ Broadcast data
Crews can send message using ACARS function pages or relevant MCDU pages.
Only one FMGC talks to the ground station. This FMGC is called FMGC “master”.
GENERAL SCRATCHPAD MESSAGES
NOT XMITTED TO
ACARS
: A crew request or report was sent to the ground but the
communication was not established or not acknowledged.
NO ANSWER TO
REQUEST
: A crew request was previously sent to the ground and no answer
(uplink message) was received within 4 min.
FLIGHT PLAN INITIALIZATION FUNCTION
Applicable to: ALL
This function enables lateral and vertical flight plan data as well as performance data to be
exchanged between the aircraft and a ground station. The aircraft may send flight plan requests
for active and secondary flight plan. (downlink messages). The ground station may send flight plan
and performance data (uplink messages) either under aircraft request or automatically without any
request.
Each uplink message concerns either the active or secondary flight plan but never both flight plans at
the same time. The data sent to the aircraft are checked for flight plan consistency.
A MCDU message comes up when an uplink message is received. “ACT (or SEC) RTE UPLINK”.
If an error prevents the decoding process of the message, “INVALID RTE UPLINK” is displayed on
MCDUs.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - ACARS INTERFACE
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FCOM 19 AUG 10
An uplink message can be routed to the active flight plan if no engine is started and no active flight
plan exists. Otherwise, it is routed to the secondary. The crew will insert it into the secondary flight
plan or will reject it using the CLR key.
Note: The flight plan may also be initialized using the ACARS function page selected from DATA
INDEX page.
PERFORMANCE DATA
On ground and before engine start, the ground station may also send performance data to the
aircraft.
Performance data are always associated with the uplink flight plan. It is either automatically
inserted with the active flight plan data, or stored in the secondary with the corresponding flight
plan.
This message contains part or all of the following data :
ZFW, ZFWCG, taxi fuel, block fuel, cruise flight level, tropopause altitude, cruise temperature,
transition altitude, cost index, performance factor.
Note: After engine start an uplink performance data message is rejected automatically without
any scratchpad message.
SCRATCHPAD MESSAGES RELATED TO FLIGHT PLAN AND PERFORMANCE
INVALID RTE UPLINK An error is detected, the uplink message is rejected.
ACT or SEC RTE UPLINK A F-PLN is stored in the active or secondary flight plan.
FLT NUMBER UPLINK FLT NBR has been initialized within a F-PLN message without
previous request.
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OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - ACARS INTERFACE
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CHECK FLT NUMBER The uplinked FLT NBR differs from the one specified in the request.
CHECK CO RTE The uplinked CO RTE ident differs from the one specified in the
request.
INVALID FLT NBR UPLINK The uplink contains a valid F-PLN but the FLT NBR is invalid.
PERF DATA UPLINK Performance data is received
INVALID PERF UPLINK Performance uplink message has been rejected
RTE DATALINK IN PROG A flight plan modification is performed after a F-PLN INIT request has
been sent ; this message is displayed until the uplink is received.
UPLINK INSERT IN PROG This message is displayed during insertion of a Flight Plan.
　
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