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FOR PREDICTION
CCM ALL
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┃I  -~ A318                      ┃    AUTO FLIGHT   ┃1.22.20    P 26b  ┃
┃  .-,,.8, ,, ~L,~ A319          ┃                  ┃                  ┃
┃ Lli,~ A320                     ┃                  ┃                  ┃
┃                                ┃                  ┣━━━━┳━━━━┫
┃      A~7-~'M" A321             ┃FLIGHT MANAGEMENT ┃SEQ 001 ┃REV 35  ┃
┃   FLIGHT CREW OPERATING MANUAL ┃                  ┃        ┃        ┃
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ENERGY CIRCLE
The energy circle is a green arc, centered on the aircraft's position and oriented towards
the current track line. It is displayed on the NDs during descent, when HDG or TRK mode
is selected. It represents the required distance to land from the aircraft's position down to
airport elevation at VAPP speed, considering all speed constraints on the vertical profile.
PERF FACTOR
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 FMGS. It is necessary when the
aircraft's performance differs from the performance model stored in the FMGS database.
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 = FFmodel (1 + PERF FACT/IO0).
FFpred is the FF used for prediction.
FFmodel is the FF from the aero-engine model.
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).
R   Procedure for modifying the PERF factor (on ground only) :
R   On the aircraft status page :
R   - WRITE the new PERF factor.
R   - INSERT using [ 6R ] key.
R   A manually-entered PERF factor is displayed in large blue fonts. Changing a PERF factor is
R   usually the responsibility of maintenance, or Flight Operations.
CCM ALL
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┃I  -~ A318                      ┃    AUTO FLIGHT   ┃1.22.20     P 27  ┃
┃  .*,,.8, ,, ~L,~ A319          ┃                  ┃                  ┃
　
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本文鏈接地址：AIRBUS A320 Flight Crew Operating Manual2(13)