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top of descent. It is dashed after this point.
The OPT FL is a compromise between fuel and time saving. As a result, the flight crew may
observe jumps in OPT FL due to slight GW, ISA or wind changes.
The computation of the OPT FL considers the wind entries made at the different altitudes
(normally at the different CRZ FL).
When flying the subsequent CRZ FL, the OPT FL proposed by the PROG page may be affected
by the wind entries made at the previous CRZ FL; these winds are propagated automatically and
may be significantly different from the actual winds.
Note: For simplification purposes, the FCOM/QRH gives the OPT FL at a given Mach number.
It does not consider the cost index, therefore the FMGES and the FCOM/QRH values are
different.
The FM updates it continuously during the cruise phase, and displays it on the PROG page.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
PERFORMANCE - OPTIMIZATION
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FCOM 19 AUG 10
The PROG page displays dashes for this quantity:
At least 15 nm before top of descent‐
When the system detects an engine‐-out condition
When DES phase is activated.‐
OPTIMUM DESCENT PATH
The vertical flight path is computed to minimize fuel consumption while satisfying the various
altitude constraints and the descent speed profile in order to reach VAPP at 1 000 ft.
The computer calculates the descent profile before the descent phase is initiated, taking into
account:
All the lateral and vertical flight plan data‐
The descent and approach winds, as inserted into the DESCENT WIND page and PERF APPR‐
page, and the required maximum cabin rate of descent.
During descent, the descent profile is updated only if the flight plan is modified or if data for the
APPR phase (WIND, VAPP, or LDG CONF) are changed.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
PERFORMANCE - OPTIMIZATION
Intentionally left blank
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FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
PERFORMANCE - COST INDEX (CI)
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FCOM 19 AUG 10
COST INDEX (CI)
Applicable to: ALL
The cost index is a fundamental input for the ECON SPEED or ECON MACH computation. ECON
SPEED and ECON MACH reduce the total flight cost in terms of flight time and fuel consumption
(and not only in terms of fuel saving).
CI is the ratio of flight time cost (CT) to fuel cost (CF).
CI = CT/CF (kg/min or 100 lb/h).
CI = 0 corresponds to minimum fuel consumption (MAX Range).
CI = 999 corresponds to minimum time.
CI = Long Range Cruise (Refer to PRO-NOR-SRP-01-50-B PREPARATION FOR DESCENT AND
APPROACH - COST INDEX FOR LONG-RANGE CRUISE).
It is recommended to modify the CI in flight:
In case a fuel problem is encountered, CI = 0 may be selected. The ECON SPD profile is then‐
computed to ensure minimum fuel consumption.
In case the aircraft is behind its schedule, CI = 999 may be selected‐. The ECON SPD profile is
then computed to ensure minimum time.
OPTIMUM STEP POINT
Only one optimum step point may be computed from the current cruise FL to a higher cruise FL.
After insertion, the optimum step point is fixed and no longer updated.
The step altitude, time and fuel savings are provided before the insertion of an optimum step climb
point on the STEP ALTS page.
Note: The airline’s operations department usually defines the cost index to optimize each
company route. The flight crew does not ordinarily modify the cost index during a flight.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
PERFORMANCE - COST INDEX (CI)
Intentionally left blank
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FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
PERFORMANCE - PREDICTIONS
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FCOM 19 AUG 10
GENERAL
Applicable to: ALL
The FMGEC computes predictions for the primary flight plan and the secondary flight plan and
displays them on the Multipurpose Control and Display Units (MCDUs) and on the Navigation Display
(ND) of the Electronic Flight Instrument System (EFIS).
The computations use the current state of the aircraft (GW, CG, position, altitude, speed, engaged
mode of the autopilot or flight director, time, wind, temperature) for the active flight plan.
PREDICTIONS FOR THE PRIMARY FLIGHT PLAN
Applicable to: ALL
　
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