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Dual Flight Management Systems (integrated with the Flight Guidance and Flight Envelope computing
functions; FMS) combine the data from the aircraft navigation sensors, including the optional GPS
installation. Backup navigation facilities are included in each pilot’s MCDU, allowing the aircraft to be
dispatched with an inoperative FMS.
The FMS permits the crew to select an optimal flight plan for their route from a selection in the airline
navigation data base, allowing the aircraft to fly automatically, through the autopilot or flight director,
from just after take-off until the crew elects to carry out a precision approach and automatic landing.
The “canned” flight plan captures the data needed for flight from the specifications entered by the crew
prior to departure, as well as along the route as conditions change and more current information on
weather and routing becomes available.
© 2001 by CRC Press LLC
New FMSs, with improved cost of ownership and capability, are being installed on aircraft delivered
from mid-2000. The same new FMSs are being installed on the A320 family.
30.9 Flight Controls
The flight control system of the A330/A340 is essentially the same as that of the A320, with five computers
of two different types allowing the pilot to control the aircraft in pitch, roll, and yaw. The layout of the pilot
controls is essentially the same as that of the A320 series, as are the handling qualities of the A330/A340. The
technology features are also essentially the same, with extensive use of dissimilarity in the hardware and in
the software, and extensive segregation in the hydraulic and electrical power supplies and signalling lanes. As
with the A320 series, mechanical signalling is used for the rudder and for the horizontal stabilizer trim backup.
Detail changes have been introduced reflecting the longer mission times, specially of the A340, to
provide better access to the system, and the opportunity has been taken to reduce the variety of backup
submodes that the crew must use, making the aircraft even easier to fly.
Like the A320 series, the A330/A340 is a conventional, naturally stable airliner. The electronic flight
controls offer a number of advantages to the pilot. There is a large reduction in manually operated
mechanical parts, easier troubleshooting, and no need for rigging. Optimal use of the control surfaces
is facilitated, as is the use of maneuver load alleviation.
The passengers and crew benefit as well, since the aircraft is more comfortable and easier to fly with
precision in turbulence, while the flight envelope and structural protection features allow the crew to
immediately use the whole capability of the aircraft should it be needed in an extreme situation.
30.10 Central Maintenance System
The A320, with its Central Fault Display System (CFDS), pioneered the industry standard for Central
Maintenance Systems (CMS).
This industry background of experience has been built into the A330/A340 CMS. It enables troubleshooting
and return-to-service testing to be carried out rapidly and with a high degree of confidence,
from the cockpit. Much of the CMS information may also be accessed remotely, via ACARS, giving the
capability for the aircraft to be greeted upon arrival by a maintenance technician that already has a good
idea of the exact nature of any defect, and who has likely been able to procure from stores the proper
spare LRU required to resolve the fault.
Compared with the previous generation of CMSs, such as the A320 CFDS, the A330/A340 CMS has
been improved in a number of respects, allowing trouble-shooting to take place on more than one system
at a time, and with even clearer data available for the job. There has been a significant improvement in
dependability as well, with great attention being paid to maintainability standards by the systems designers
and the equipment vendors, and the incorporation of a maintenance message filter facility that enables
known false message to be eliminated by the CMS, so that the mechanic does not apply the maxim
“
Falsus in Uno, Falsus in Omnibus
.”*
30.11 Communications
There is a quiet revolution going on in the way that the crew communicates with the ground. This has
been taking place in two ways. The A330/A340 uses the same full-capability standardized flight crew
audio and frequency selections system as used on the A320 series, and also largely used on other recent
derivative aircraft. This is a break from the traditional highly customized lower-capability systems.
*“False in one thing — false in all.”
© 2001 by CRC Press LLC
The other aspect of the revolution is more far-reaching, in that voice communication is giving way to
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