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┃   FLIGHT CREW OPERATING MANUAL ┃                  ┃        ┃        ┃
┗━━━━━━━━━━━━━━━━┻━━━━━━━━━┻━━━━┻━━━━┛
lIE]
                             DES
ACT MODE    UTC DEST EFOB
ECON          0844           7.4
  cI
50
  ECON
   .79/322
  PREV
<PHASE
.75/300
  NEXT
PHASE>
                             DES
ACT MODE    UTC DEST EFOB
AUTO  SPD   0845           7.4
  cI
50
  AUTO SPD
   .75/300
  PREV
<PHASE
  NEXT
PHASE>
R   The pilot can revert to the optimum speed/Mach by clearing the field 3L
Optimum target Mach number in cruise
FM computes ECON CRZ MACH as the optimum speed and updates it continually, taking
into account :
- current weather conditions
- modifications to the flight plan
Note ~ Below FL 250 the FMGS calculates ECON CRZ SPD instead of ECON CRZ MACH
Optimum flight level in cruise
The optimum flight level is the flight level at which the aircraft incurs the lowest cost for
a given flight plan, cost index, and gross weight. FM updates it continuously during the
cruise phase, and displays it on the PROG page. The PROG page displays dashes for this
quantity :
- at least 15 NM before top of descent
- when the system detects an engine-out condition
- when DES phase is activated
PILOT
SELECTED
MACH
ECON
CRZ MACH
┏━━━━━━━━━━━━━━━━━━┓
┃                                CRZ ┃
┃  ACT MODE    UTC PEST EFOB         ┃
┃  MACH.78     1215           8.4    ┃
┃     CI                      DES    ┃
┃  540                    FORECAST>  ┃
┃     ECON                           ┃
┃    ACTIVATE             NEXT       ┃
┃  ~APPR  PHASE           PHASE>     ┃
┗━━━━━━━━━━━━━━━━━━┛
PERF CRZ PAGE
EE]m
F~F~
E~E]
DD
OPTIMUM
   FL
┏━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃                                   ~  DES         ┃
┃                                          AF5612  ┃
┃     CRZ~         OPT    REC MAX                  ┃
┃                             FL350        FL390   ┃
┃                                VDEV= +  39OFT    ┃
┃     UPDATE AT                                    ┃
　
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本文鏈接地址：AIRBUS A320 Flight Crew Operating Manual2(9)