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FCOM 19 AUG 10
Applicable to:
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PERF FACTOR VALUE
The PERF factors to be used on FMS2, 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 non/P (without the new LP and HP blade compressor), a positive
performance factor has to be entered on the MCDU STATUS page to increase the FMGS’
predicted fuel consumption and match the actual fuel burnt.
NON/P /P
SAC DAC SAC DAC
A321-111 CFM56-5B1 2 2 0 1
A321-112 CFM56-5B2 2 2 0 1
A321-211 CFM56-5B3 2 2 0 1
A321-212 CFM56-5B1 2 2 0 1
A321-213 CFM56-5B2 2 2 0 1
A321-214 CFM56-5B4 - - 1 -
A320-214 CFM56-5B4 3 3 0 1
A320-215 CFM56-5B5 - - 0 -
A320-216 CFM56-5B6 - - 0 -
A319-111 CFM56-5B5 4.5 4.5 0 1
A319-112 CFM56-5B6 4.5 4.5 0 1
A319-115 CFM56-5B7 4.5 4.5 0 1
A318-111 CFM56-5B8 - - 0 -
A318-112 CFM56-5B9 - - 0 -
‐ For other engines:
• A318 “PW": 0.0 %
• A319/A320 “CFM” Family fitted with CFM 56-5A engines: 0.0 %
• A319/A320/A321 “IAE” Family: 0.0 %
All these numbers assume that:
‐ The aircraft is brand-new
‐ Anti-ice is OFF
‐ The air conditioning is on NORMAL for “IAE” engines and on LOW for “CFM” engines
‐ The conservative Fuel Lower Heating Value (FLHV) is0 btu/lb.
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 23/24
FCOM 19 AUG 10
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.
Note: 1. At delivery, ENTER the PERF factor (given in the table above) directly in the MCDU
(no correction factor is needed).
2. When replacing an FMS1 Legacy by an FMS2, on any given aircraft model, the
performance model that is stored in the FMS2 may be different from the one that was
previously stored in the FMS1 Legacy.
As a result, DISREGARD the PERF factor previously entered in the MCDU.
ADD the “monitored fuel factor” (when available) to the PERF factor (given above),
and ENTER the resulting factor in the MCDU.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
PERFORMANCE - PREDICTIONS
Intentionally left blank
A318/A319/A320/A321 FLEET DSC-22_20-40-30 P 24/24
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
CONTROLS AND INDICATORS - MCDU - PAGE DESCRIPTION
A318/A319/A320/A321 FLEET DSC-22_20-50-10-25 P 1/104
FCOM 19 AUG 10
FMS2 HONEYWELL
GENERAL
Applicable to:
The Flight Management and Guidance System (FMGS) displays information on various “pages”.
When a page cannot display all of the assigned information, it cues the pilot to call up additional
information. There are three types of pages, and each type has its particular way of cuing the pilot to
call up additional information.
FIRST TYPE
When this page cannot simultaneously display all the information on the screen (more information
than the six pairs of lines can hold), the pilot can scroll the page up or down.
In this case, the screen displays a ↑↓ symbol in the bottom righthand corner (F-PLN pages,
secondary F-PLN page, departure/arrival pages,...).
SECOND TYPE
When the information is on successive pages, the pilot presses the “NEXT PAGE” key to
sequentially call up these pages.
In this case, an arrow is displayed in the top righthand corner of the screen (INIT pages).
THIRD TYPE
When different types of information are on successive pages, the pilot calls up these pages by
pressing the key adjacent to the prompts >, < or *.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
CONTROLS AND INDICATORS - MCDU - PAGE DESCRIPTION
　
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