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B - on ground during landing.
C - on ground during take-off and landing.
The aircraft is in cruise with AP 1 engaged. What
happens when AP 2 is engaged?
A - AP 1 remains active, AP 2 is in standby.
B - AP 2 becomes active with AP 1 in standby.
C - AP 2 becomes active, AP 1 is disengaged.
The aircraft is on ground:
A - It is impossible to engage the autopilot.
B - Engines running, it is impossible to
engage the autopilot.
C - Engines shut down, it is impossible to
engage the autopilot.
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
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ALL
22 - AUTO FLIGHT SYSTEM
22-10-00 FLIGHT DIRECTOR
CONTENTS:
Engagement
Principle
FD Pushbuttons
FD Bars
FPD/FPV Symbols
Self Examination
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 27
ALL
FLIGHT DIRECTOR
ENGAGEMENT
The Flight Director (FD) functions engage
automatically as soon as the system is electrically
supplied and logic conditions are fulfilled.
FD engagement is indicated on the Flight Control Unit
(FCU) by the FD pushbutton green bars and on the top
right of each Primary Flight Display (PFD).
1FD2 indication is displayed on each PFD to show that
FD 1 is engaged on the Capt side and FD 2 is engaged
on the F/O side.
NOTE: On ground, as long as no AP/FD mode is active,
there are no FD symbols on the PFDs.
PRINCIPLE
The FD displays the Flight Management and Guidance
Computer (FMGC) guidance commands on both PFDs.
In manual flight, the FD displays guidance orders to
help the pilots to apply commands on the controls in
order to follow the optimum flight path which would
be ordered by the autopilot (AP) if it were engaged.
When the AP is engaged, the FD enables the FMGC demands
to be checked.
The FD modes are the same as the AP modes and are
selected in the same way.
The FMGCs calculate AP/FD orders which are transformed
into symbols by the Display Management Computers
(DMCs).
There are two types of symbols: The FD bars, and the
Flight Path Director and Flight Path Vector symbols.
The central HDG-V/S / TRK-FPA pushbutton on the FCU
allows the pilots to switch between these two types
of symbols.
FD PUSHBUTTONS
Upon FCU power up, or in go around, or when losing the
AP during the roll out phase of the landing, the three
green bars of the FD pushbuttons come on automatically.
A lit FD pushbutton means that the FD symbols can be
displayed on the corresponding PFD ("Corresponding"
means PFD 1 for the Capt FD pushbutton and PFD 2 for
the F/O FD pushbutton).
If a lit FD pushbutton is pressed, the green bars go
off. Pressing the pushbutton again puts the green bars
on again.
A non lit FD pushbutton means that no FD symbols can
be displayed on the corresponding PFD.
-FD2 is displayed on each PFD to show that no FD symbols
can be displayed on PFD 1 and FD 2 is engaged on the
F/O side.
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 28
ALL
FLIGHT DIRECTOR - ENGAGEMENT / PRINCIPLE / FD PUSHBUTTONS
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 29
ALL
FLIGHT DIRECTOR
FD BARS
The FD bars can be displayed provided HDG-V/S
(Heading-Vertical Speed) is selected on the FCU.
HDG-V/S is automatically selected at system power up.
NOTE: At certain system configuration changes, the
FMGCs send a command to the DMCs to make the FD
bars flash for 10 seconds.
AP/FD modes are correctly followed when the FD bars
are centered on the fixed aircraft model of the PFDs.
There are three FD bars:
- The pitch bar,
- the roll bar,
- and the yaw bar.
The horizontal pitch bar can be displayed if a vertical
mode is active except during the roll out phase of the
landing.
The vertical roll bar can be displayed if a lateral
mode is active.
Below 30 feet radio altitude at take-off (when a LOC
signal is available) and during landing, the roll bar
　
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