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The following figure shows the IDLE factor effect on the descent length.
Example: IDLE factor of +4 increases the computed descent by 11 nm.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
PERFORMANCE - PREDICTIONS
A330/A340 FLEET DSC-22_20-40-30 P 13/18
FCOM 19 AUG 10
IDLE FACTOR AT DELIVERY
If the FADEC A11.4 or a more recent FADEC Standard is fitted on both engines, the IDLE factor
set at delivery is +4 %. Otherwise, it is 0 %.
PERF FACTOR
Applicable to: ALL
GENERAL
The PERF factor is a positive or negative percentage that is used to correct the predicted fuel flow,
used for fuel prediction computation within the FMGES. It is necessary when the actual aircraft
performance differs from the performance model stored in the FMGES database, usually due to an
increase in aircraft drag and engine performance deterioration.
This difference can be due to one or both of the following cases:
1. The FMS contains a performance database, used to compute the predictions and the
performance data. Due to the numerous possible aircraft configurations, the same performance
database is sometimes used for aircraft with slightly different behaviors. In these cases, a PERF
factor is entered to correct the computations performed with a database not exactly tailored for
the given configuration. As a result, the aircraft or engine type identification on the MCDU’s A/C
STATUS page may not correspond to that of the actual aircraft.
2. Since the actual aircraft drag and engine performance deviate from the nominal model, due to
the aircraft’s age, airline flight operations will periodically apply a correction factor to adapt fuel
predictions to actual fuel consumption.
The PERF factor modifies the predicted fuel flow, according to the following formula:
FFpred is the FF used for prediction.
FFmodel is the FF from the aero-engine model.
This correction is applied throughout the entire flight, and modifies performance predictions and
the ECON speed or Mach.
For example: Entering a PERF factor of +1.5 means that Flight Operations have evaluated the
aircraft fuel deviation as 1.5 %, compared to the basic performance model (0.0).
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
PERFORMANCE - PREDICTIONS
A330/A340 FLEET DSC-22_20-40-30 P 14/18
FCOM 19 AUG 10
Applicable to:
PROCEDURE TO MODIFY THE PERF FACTOR (ON GROUND ONLY)
PRESS the MCDU DATA key and then the A/C STATUS prompt in order to access the A/C‐
STATUS page.
ENTER the change code in the CHG CODE field [5L].‐
The default value for this code is “ARM” but it is possible to modify it on airline request (the
applicable code is then coded in the Navigation Database policy file).
When a valid change code is entered, the IDLE and PERF factors are displayed in blue.
ENTER “/” and the new PERF factor in the scratchpad.‐
PRESS the [6L] key to insert the new PERF factor.‐
The new PERF factor is displayed in large blue font.
Note: Only authorized personnel should take the responsibility to update the PERF factor
value.
Applicable to: ,
PROCEDURE TO MODIFY THE PERF FACTOR (ON GROUND ONLY)
PRESS the MCDU DATA key and then the‐ A/C STATUS prompt in order to access the A/C
STATUS page.
ENTER the change code in the CHG CODE field [5L].‐
The default value for this code is “ARM” but it is possible to modify it on airline request (the
applicable code is then coded in the Airline Modifiable Information (AMI) file).
When a valid change code is entered, the IDLE and PERF factors are displayed in blue.
ENTER “/” and the new PERF factor in the scratchpad.‐
PRESS the [6L] key to insert the new PERF factor.‐
The new PERF factor is displayed in large blue font.
Note: Only authorized personnel should take the responsibility to update the PERF factor
value.
Applicable to:
PERF FACTOR VALUES
The PERF factors to be used on FMS1 at delivery, depending on engine type, are:
A340‐-211 CFM56-5C2: -1.5 %
A340‐-212 CFM56-5C3: -3.0 %
A340‐-213 CFM56-5C4: -2.0 %
A340‐-311 CFM56-5C2: -1.5 %
A340‐-312 CFM56-5C3: -1.5 %
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
PERFORMANCE - PREDICTIONS
A330/A340 FLEET DSC-22_20-40-30 P 15/18
FCOM 19 AUG 10
A340‐-313 CFM56-5C4: -0.5 %
A340‐–313E or A340–300B CFM56–5C4: 0.0 %
All these numbers assume that:
The aircraft is brand‐-new
Anti‐-ice is OFF
The air conditioning is on NORMAL‐
　
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