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┃ A~;-~'M" A321 ┃ ┃ ┃ ┃
┃ FLIGHT CREW OPERATING MANUAL ┃ ┃ ┃ ┃
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Optimum target speed for CLB or DES phase
The FMGC computes optimum speeds as functions of :
- the gross weight (GW)
- the cost index (CI)
- the cruise flight level (CRZ FL)
- the wind and temperature models
- the performance factor
When there is no time or speed constraint/limit, ECON SPEED is the optimum speed for the
selected cost index. It refers to fuel and time cost and not directly to fuel saving.
The FM calculates ECON CLB, ECON DES and the associated top of climb and top of
descent as a function of cost index, cruise FL, and meteo data.
R Preset target speed for CLB phase
R The pilot can preselect the climb speed before the CLB phase begins, by inserting a speed
R in the SPD field :
R
8 r~
T
D
D
i
o
c~
N
' Fq
' D
Lzh
2
CLB
ACT MODE TIME DEST EFOB
ECON 0053 7.6
cz
5O
ECON
250
SPD
~E 3
PREV
<PHASE
220
NEXT
PHASE>
CLB
ACT MODE TIME DEST EFOB
SPD 220 0057 7.5
cI
5O
ECON
~zso
SPb
220
PREV
<PHASE
NEXT
PHASE>
The active mode field changes from ECON to SPD XXX (XXX being the speed entered in the
SPD field), and the FM will use the entered speed for climb predictions computation. The
pilot can revert to managed mode by pressing the 3L key.
Preset target speed/Mach for DES phase
The pilot can change the speed and/or Mach displayed in the ECON field before the DES
phase begins by inserting a speed and/or Mach in the ECON field.
The 3L field name changes from ECON to AUTO SPD.
Although the entered speed is choosen by the pilot, the FMGS uses it to compute the
descent flight path and top of descent. It is therefore part of the managed descent profile.
CCM ALL
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┃I ~--~ A318 ┃ AUTO FLIGHT ┃1.22.20 P 23 ┃
┃ aw aw ,, ~4W~ A319 ┃ ┃ ┃
┃ LI,~ A320 ┃ ┃ ┃
┃ ┃ ┣━━━━┳━━━━┫
┃ A~7-~'M" A321 ┃FLIGHT MANAGEMENT ┃SEQ 001 ┃REV 35 ┃
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本文链接地址：
AIRBUS A320 Flight Crew Operating Manual2(8)
