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┃I ~-~ A318 ┃I FLIGHT AUGMENTATION ┃SEQ 001 1 ┃I REV 24 ┃
┃ aw aw ,, ~L,~ A319 ┃ ┃ ┃ ┃
┃ Lii,~ A320 ┃ ┃ ┃ ┃
┃ A~7-~'M" A321 ┃ ┃ ┃ ┃
┃ FLIGHT CREW OPERATING MANUAL ┃ ┃ ┃ ┃
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As long as one Flight Augmentation Computer (FAC) is valid, it governs the flight envelope
function, the rudder position display, and the rudder trim indication regardless of what the
pilot does with the FAC pushbutton.
PFD SPEED SCALE MANAGEMENT
The FAC controls the speed scale on the PFD. (Refer to 1.31)
When both FACs are operative, FAC1 supplies data to PFD1 and FAC2 supplies it to PFD2.
The FAC computes :
- The minimum and maximum speeds :
. VSW (stall warning)
. VLS
. VFE and VFE for the next configuration
. VLE
. VMO/MMO
- The maneuvering speeds :
. Green Dot Speed
. S speed
. F speed
(Refer to 3.04.10 for speed definition).
The FAC also computes the speed trend and displays it as an arrow on the PFD speed
scale.
The PFD displays these various speeds as appropriate, and they also go to the FMGC to
be used as limits for various guidance modes
Note : The principle of the speed computation is as follows :
- First, the FAC computes VSIG (stall speed). From VSIG it computes the gross
weight which is also sent to the Elevator Aileron computers :
, When the aircraft is below 14500 feet and 250 knots, it computes this from
current angle of attack, speed/Mach, altitude, thrust, and CG.
, When the aircraft is above 14500 feet or 250 knots, it computes this out of the
GW, which it has memorized and updated with a fuel consumption model set
in the FAC.
- Finally the FAC computes the various minimum and maneuvering speeds, Vo~
prot and Vsn.
- The accuracies of the various minimum and maximum speeds are functions of
the accuracy with which the FAC computes aircraft gross weight. Normal
accuracy for VLS in CONFIG FULL is about +_ 3 kt.
CCM ALL
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┃I -~ A318 ┃ AUTO FLIGHT ┃1.22.40 P 5 ┃
┃ .-,,.8, ,, ~e~ A319 ┃ ┃ ┃
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本文链接地址：
AIRBUS A320 Flight Crew Operating Manual2(95)
