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active flight plan.
The computations use pilot-entered data for the secondary flight plan when it is not a
copy of the active flight plan.
When the secondary flight plan is a copy of the active flight plan, it uses the same
data.
PREDICTIONS FOR THE PRIMARY FLIGHT PLAN
The predictions displayed on the MCDU assume that the system will guide the aircraft
along the preplanned lateral and vertical flight plans.
The predictions displayed on the ND assume that the aircraft will continue to operate in
the modes (selected or managed) that are currently active.
As long as the aircraft is flying the flight plan under managed guidance, the predictions
on the MCDU will match those on the ND.
If the pilot does not fly the flight plan, the MCDU predictions assume that :
- The pilot will fly back towards the flight-planned route.
- The pilot will immediately resume flying the FMGC-managed modes.
If the pilot does not fly the managed speed profile, the MCDU predictions assume that he
will maintain the selected speed until he reaches :
- In the climb or descent phase, the next speed limit or speed constraint if any, or next
   phase,
- In cruise, the top of descent.
Then, the predictions assume that the pilot will revert to managed speed
CCM ALL
┏━━━━━━━━━━━━━━━━┳━━━━━━━━━┳━━━━━━━━━┓
┃I  -~ A318                      ┃    AUTO FLIGHT   ┃1.22.20     P 25  ┃
┃  .-,,.8, ,, ~e~ A319           ┃                  ┃                  ┃
┃ Lli,~ A320                     ┃                  ┃                  ┃
┃                                ┃                  ┣━━━━┳━━━━┫
┃      A~7-~'M" A321             ┃FLIGHT MANAGEMENT ┃SEQ 001 ┃REV 35  ┃
┃   FLIGHT CREW OPERATING MANUAL ┃                  ┃        ┃        ┃
┗━━━━━━━━━━━━━━━━┻━━━━━━━━━┻━━━━┻━━━━┛
UPDATE OF PREDICTIONS
The FMGCs recompute the predictions whenever there is a modification to
- the lateral flight plan
- the vertical flight plan
- forecast atmospheric conditions entered by the crew
- the cost index
- speed control (managed/selected)
Note : During recomputation, prediction fields on the MCDU pages show dashes
WINDS USED FOR PREDICTIONS
See VERTICAL FUNCTIONS, FMGS Pilot's Guide, 04.04.20
EFIS ND PREDICTIONS
Refer to FLIGHT MANAGEMENT PRINCIPLES, 4.02.20
MCDU PREDICTIONS
Refer to FLIGHT MANAGEMENT PRINCIPLES, 4.02.20
Predictions for secondary flight plan
Refer to FCOM 4.04.30 Secondary flight plan
OTHER COMPUTATIONS
Engine-out case
The FMGS computes an engine-out target speed for each flight phase.
It computes an engine-out maximum altitude at long-range cruise speed, and displays it on
the PROG page.
When the aircraft loses an engine, it also loses predictions for the active flight plan, in the
takeoff, climb, and cruise phases. However, the system restores predictions for twin-engine
operation in the descent and approach phases.
Recommended maximum altitude (REC MAX)
The recommended maximum altitude is the lowest of :
- maximum altitude the aircraft can reach with a 0.3 g buffet margin
- maximum altitude the aircraft can fly in level flight at MAX CRZ rating
- maximum altitude the aircraft can maintain a V/S of 300 feet/minute at MAX CLB thrust
- maximum altitude the aircraft can fly at a speed higher than Green Dot speed and lower
   than VMO/MMO
- maximum altitude the aircraft is certified (FL 390).
CCM ALL
┏━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━┳━━━━━━━━━━━┓
　
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本文鏈接地址：AIRBUS A320 Flight Crew Operating Manual2(11)