(*1) :  OH: Old Hardware, before Engine Serial Number 41054; NH: New Hardware, since Engine Serial Number 41054.

2.5.6. A340 aircraft
2.5.6.1. FMS1
Perf Factor 
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 
A340-313  CFM56-5C4  -0.5 
A340-313E  CFM56-5C4  0.0 

Flight Operations & Line Assistance Getting to Grips with Aircraft Performance Monitoring
USING THE MONITORED FUEL FACTOR
2.5.6.2. FMS2

Perf Factor 
A340-211  CFM56-5C2  -2.0 
A340-212  CFM56-5C3  -2.5 
A340-213  CFM56-5C4  -1.0 
A340-213E  CFM56-5C4  0.0 
A340-311  CFM56-5C2  0.0 
A340-312  CFM56-5C3  -1.0 
A340-313  CFM56-5C4  0.0 
A340-313E  CFM56-5C4  0.0 
A340-642  TRENT 556  + 0.5 % 

2.6. Procedure to change the PERF FACTOR
The PERF FACTOR should be regularly updated based on the routine aircraft performance monitoring. This paragraph details the procedure to change the PERF FACTOR in the CDU/MCDU.
Airbus recommends that only authorized and qualified staff members perform this procedure. The crew should not change the value by themselves.
The PERF FACTOR can only be modified on ground.
Note: On fly-by-wire aircraft, the PERF FACTOR is displayed in CYAN when on ground (modifiable) and in GREEN when airborne or when no change code was entered (not modifiable). It is displayed in large blue font, following a modification.
Flight Operations & Line Assistance Getting to Grips with Aircraft Performance Monitoring

USING THE MONITORED FUEL FACTOR

2.6.1. A300-600/A310 aircraft
1.
Select the CDU A/C STATUS page

2.
Type the new value

3.
Press LSK 6L.

2.6.2. A320 Family aircraft
2.6.2.1. Aircraft fitted with FMS1
1.
Select the MCDU A/C STATUS page

2.
Type the new value

3.
Press LSK 6R. The new value is displayed in large fonts (CYAN on the ground, GREEN in-flight)

2.6.2.2. Aircraft fitted with FMS2
If no PERF FACTOR was entered, the Airline Modifiable Information (AMI) values are taken into account and are displayed in small font. Changing the PERF FACTOR value thanks to the below procedure will over-ride the PERF FACTOR value that is defined in the AMI.
Flight Operations & Line Assistance Getting to Grips with Aircraft Performance Monitoring
USING THE MONITORED FUEL FACTOR

Following steps describe how to change the PERF FACTOR value:
1.
 Enter “ARM ”in the CHG CODE line [5L ]brackets (or appropriate password)
　
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