PSS A319/A320/A321 Systems Manual 系统手册(16)

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be manually entered on F-PLN pages. Flight plans can be saved to les, and later can be loaded from a le. Entering a company
route name on INIT page also allows to automatically load a ight plan, if a le with such name exists.
A lateral ight plan can include the following elements:
• Takeoff runway
• Standard instrument departure (SID)
• Enroute waypoints and airways
• Standard terminal arrival route (STAR)
• Landing runway and approach
• Alternate ight plan
An alternate airport and alternate ight plan can be specied. If diversion is desired, the alternate destination can be activated at any
point, and alternate ight plan will be inserted into active ight plan starting from a selected waypoint.
Vertical ight plan
The vertical ight plan is automatically created by the FMS based on selected cruise ight level, entered performance data, and
all speed and altitude constraints associated with waypoints. Vertical ight plan is computed to provide best performance altitude
and speed prole of the ight. When vertical ight plan is computed, the FMS is able to provide altitude, speed, time and fuel
predictions for each waypoint and for destination.
Each waypoint can contain an associated Altitude and Speed constraints. Such constraints require that the waypoint is passed at,
above, or below specic altitude, and at given speed.
Speed limits set the maximum allowable speed below specic altitude. Speed limits can exist for origin and destination airports.
The computed vertical prole provides optimum climb, when possible, to cruise ight level, longest possible ight on cruise FL, and
descent path targetting minimum power settings.
After vertical ight plan is computed, the FMS automatically inserts oating Pseudo-waypoints into ight plan which represent the
points on the route where speed change, level off or start of descent will occur. Pseudo waypoints can move on the ight plan or
disappear as the vertical ight plan is recalculated, due to guidance mode or performance changes.
Performance data
The MCDU accepts entries of such gures as Cost Index, Cruise FL, Zero Fuel Weight, Block Fuel, Assumed temperature, etc.
Based on this entry, FMS automatically computes engine thrust limits, economy speeds for all phases of ight, ight envelope limits,
and other parameters required for automatic ight.
A319/320/321
Systems Manual
Phoenix Simulation Software P 42
REV 01 SEQ 001
General principles (continued)
Flight phases
The vertical ight plan is divided into ight phases. For each phase, FMS computes the optimum speed prole.
MCDU
Flight Phase
PREFLIGHT
TAKEOFF
CLIMB
CRUISE
DESCENT
APPROACH
GO AROUND
DONE
Optimum Speed
-
V2+10
ECON CLB
ECON CRZ
ECON DES
Vapp
Highest of Vapp or Current
-
Switching condition to next phase
SRS takeoff mode engaged, Takeoff power set
At acceleration altitude
Reaching Cruise FL
Descent initiation within 200 nm of destination
Overying DECEL pseudo waypoint, or manual activation of approach phase
To DONE: soon after landing
To GO AROUND: thrust levers set at TO-GA
To CLIMB: inserting new Cruise FL
To APPROACH: manual activation of approach phase
To CLIMB: Above acceleration altitude
To PREFLIGHT: in several seconds
Managed speed guidance in DESCENT phase allows speed variation within certain range of target speed. This is done to maintain
descent path while minimizing fuel consumption. The speed may vary for up to 20 knots above or below target speed, if existing
speed limits and constraints permit so.
When APPROACH phase becomes active, the managed speed guidance will automatically decelerate the aircraft to maneuering
speed for current conguration. As aps are extended, the speed target will decrease and Vapp will be commanded when landing
aps conguration is reached.
A319/320/321
Systems Manual
Phoenix Simulation Software P 43
REV 01 SEQ 001 MCDU
MCDU Menu page
Pressing the MCDU MENU key displays the MCDU MENU page.
On real aircraft, the MCDU provides interface to various systems. Such systems as DATA LINK or AIDS are not modelled in this
simulation. Due to this, the only available system is FMGC.
Selecting FMGC or RETURN prompt will open the INIT page.
2L
1L
3L
4L
5L
6L
2R
1R
3R
　
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