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This correction is applied throughout the flight, and modifies the 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).
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 new PERF factor in the MCDU scratchpad
‐ PRESS the MCDU [6R] 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:
,
,
MSN,,,,
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 MCDU scratchpad.
‐ PRESS the MCDU [6L] key to insert the new PERF factor.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
PERFORMANCE - PREDICTIONS
A318/A319/A320/A321 FLEET DSC-22_20-40-30 P 19/24
FCOM 19 AUG 10
The new PERF factor is displayed in large blue font.
Note: Only authorized personnel should take the responsibility to update the PERF factor
value.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
PERFORMANCE - PREDICTIONS
A318/A319/A320/A321 FLEET DSC-22_20-40-30 P 20/24
FCOM 19 AUG 10
Applicable to:
PERF FACTOR VALUE
The PERF factors to be used on FMS1 at delivery, depending on engine type, are:
‐ For CFM 56-5B engines only:
Depending on the engine type: CFM 56–5B SAC (Single Annular Chamber) or DAC (Double
Annular Chambers), or /P and /2P (new LP and HP blade compressor), a negative performance
factor has to be entered on the MCDU STATUS page to decrease the FMGS’ predicted fuel
consumption and match the actual fuel burnt.
NON/P /P
SAC DAC SAC DAC
A321-111 CFM56-5B1 0.0 0.0 -2.0 -1.5
A321-112 CFM56-5B2 0.0 0.0 -2.0 -1.5
A321-211 CFM56-5B3 0.0 0.0 -2.0 -1.5
A321-212 CFM56-5B1 0.0 0.0 -2.0 -1.5
A321-213 CFM56-5B2 0.0 0.0 -2.0 -1.5
A320-214 CFM56-5B4 0.0 0.0 -3.0 -2.0
A319-111 CFM56-5B5 0.0 0.0 -4.5 -3.5
A319-112 CFM56-5B6 0.0 0.0 -4.5 -3.5
A319-115 CFM56-5B7 0.0 0.0 -4.5 -3.5
‐ For other engines:
• A321-232 V2530-A5: -0.5 %
• A321-231 V2533-A5: -0.5 %
• A321-131 V2530-A5: -0.5 %
• A320-233 V2527E-A5: +0.5 %
• A320-232 V2527-A5: +0.5 %
• A320-231 V2500-A1: 0.0 %
• A320-212 CFM 56–5A3: +0.5 %
• A320-211 CFM 56–5A1: +0.5 %
• A320-111 CFM 56–5A1: 0.0 %
• A319-133 V2527M-A5: -0.5 %
• A319-132 V2524-A5: -0.5 %
• A319-131 V2522-A5: -0.5 %
• A319-114 CFM 56-5A5: 0.0 %
• A319-113 CFM 56-5A4: 0.0 %
All these numbers assume that:
‐ The aircraft is brand-new
‐ Anti-ice is OFF
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
PERFORMANCE - PREDICTIONS
A318/A319/A320/A321 FLEET DSC-22_20-40-30 P 21/24
FCOM 19 AUG 10
‐ The air conditioning is on NORMAL
‐ The conservative Fuel Lower Heating Value (FLHV) is0 btu/lb.
When an aircraft ages, fuel consumption degradation will be measured to determine the so-called
“monitored fuel factor”. This factor corresponds to the deviation of the aircraft’s actual fuel
consumption from the nominal model. Generally, the FLHV that is used during fuel factor
monitoring is higher than the FMS value.
In order not to penalize FMS predictions, it is necessary to correct the “monitored fuel factor”.
For example, add -1 % to the “monitored fuel factor”, when an FLHV of0 btu/lb is used.
Once this factor is established by the airline, it should be arithmetically added to the above-noted
performance factor.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
PERFORMANCE - PREDICTIONS
A318/A319/A320/A321 FLEET DSC-22_20-40-30 P 22/24
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